How to clear Flutter's Build cache?

you can run flutter clean command

Node.js heap out of memory

If you are trying to launch not node itself, but some other soft, for example webpack you can use the environment variable and cross-env package:

$ cross-env NODE_OPTIONS='--max-old-space-size=4096' \
  webpack --progress --config build/webpack.config.dev.js

Session 'app': Error Launching activity

For me the problem was that the app I was trying to launch was already installed under a different user account on my phone. I saw this when I went to Settings->apps looking to uninstall it. I switched to the other user, uninstalled it, came back to the original user, and was able to install and launch the app from Android Studio with no more problems.

Bootstrap : TypeError: $(...).modal is not a function

Use this. It will work. I have used bootstrap 3.3.5 and jquery 1.11.3

_x000D_

$('document').ready(function() {_x000D_
  $('#btnTest').click(function() {_x000D_
    $('#dummyModal').modal('show');_x000D_
  });_x000D_
});

_x000D_

body {_x000D_
  background-color: #eee;_x000D_
  padding-top: 40px;_x000D_
  padding-bottom: 40px;_x000D_
}

_x000D_

<!DOCTYPE html>_x000D_
<html>_x000D_
_x000D_
<head>_x000D_
  <meta charset="utf8">_x000D_
  <meta http-equiv="X-UA-Compatible" content="IE=edge">_x000D_
  <meta name="viewport" content="width=device-width,initial-scale=1">_x000D_
  <link rel="stylesheet" type="text/css" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.5/css/bootstrap.min.css">_x000D_
  <title>Modal Test</title>_x000D_
</head>_x000D_
_x000D_
<body>_x000D_
  <div class="container">_x000D_
    <button id="btnTest" class="btn btn-default">Show Modal</button>_x000D_
    <div id="dummyModal" role="dialog" class="modal fade">_x000D_
      <div class="modal-dialog">_x000D_
        <div class="modal-content">_x000D_
          <div class="modal-header">_x000D_
            <button type="button" data-dismiss="modal" class="close">&times;</button>_x000D_
            <h4 class="modal-title">Error</h4>_x000D_
          </div>_x000D_
          <div class="modal-body">_x000D_
            <p>Quick Brown Fox Jumps Over The Lazy Dog</p>_x000D_
          </div>_x000D_
          <div class="modal-footer">_x000D_
            <button type="button" data-dismiss="modal" class="btn btn-default">Close</button>_x000D_
          </div>_x000D_
        </div>_x000D_
      </div>_x000D_
    </div>_x000D_
  </div>_x000D_
  <script type="text/javascript" src="https://code.jquery.com/jquery-1.11.3.min.js"></script>_x000D_
  <script type="text/javascript" src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.5/js/bootstrap.min.js"></script>_x000D_
</body>_x000D_
_x000D_
</html>

_x000D_

Android Error [Attempt to invoke virtual method 'void android.app.ActionBar' on a null object reference]

In my case is because of styles.xml set the wrong parent theme, i.e. NoActionBar theme of course getSupportActionbar() is null:

<style name="AppTheme" parent="Theme.AppCompat.Light.NoActionBar">

Changed it to something else fixed it:

<style name="AppTheme" parent="Theme.AppCompat.Light.DarkActionBar">

IE11 meta element Breaks SVG

You have duplicate style attributes on each element.

style="opacity:0.8"

This certainly does not display on Firefox for me because of this error. If it displays on Chrome, best raise a Chrome bug.

sudo service mongodb restart gives "unrecognized service error" in ubuntu 14.0.4

For debian, from the 10gen repo, between 2.4.x and 2.6.x, they renamed the init script /etc/init.d/mongodb to /etc/init.d/mongod, and the default config file from /etc/mongodb.conf to /etc/mongod.conf, and the PID and lock files from "mongodb" to "mongod" too. This made upgrading a pain, and I don't see it mentioned in their docs anywhere. Anyway, the solution is to remove the old "mongodb" versions:

update-rc.d -f mongodb remove
rm /etc/init.d/mongodb
rm /var/run/mongodb.pid
diff -ur /etc/mongodb.conf /etc/mongod.conf

Now, look and see what config changes you need to keep, and put them in mongod.conf.

Then:

rm /etc/mongodb.conf

Now you can:

service mongod restart

Android Studio - Unable to find valid certification path to requested target

For me it was my internet, I was working on restricted network

SyntaxError: JSON.parse: unexpected character at line 1 column 1 of the JSON data

When the result is success but you get the "<" character, it means that some PHP error is returned.

If you want to see all message, you could get the result as a success response getting by the following:

success: function(response){
     var out = "";
     for(var i = 0; i < response.length; i++) {
        out += response[i];
     }
     alert(out) ;
},

Plotting a fast Fourier transform in Python

So I run a functionally equivalent form of your code in an IPython notebook:

%matplotlib inline
import numpy as np
import matplotlib.pyplot as plt
import scipy.fftpack

# Number of samplepoints
N = 600
# sample spacing
T = 1.0 / 800.0
x = np.linspace(0.0, N*T, N)
y = np.sin(50.0 * 2.0*np.pi*x) + 0.5*np.sin(80.0 * 2.0*np.pi*x)
yf = scipy.fftpack.fft(y)
xf = np.linspace(0.0, 1.0/(2.0*T), N/2)

fig, ax = plt.subplots()
ax.plot(xf, 2.0/N * np.abs(yf[:N//2]))
plt.show()

I get what I believe to be very reasonable output.

enter image description here

It's been longer than I care to admit since I was in engineering school thinking about signal processing, but spikes at 50 and 80 are exactly what I would expect. So what's the issue?

In response to the raw data and comments being posted

The problem here is that you don't have periodic data. You should always inspect the data that you feed into any algorithm to make sure that it's appropriate.

import pandas
import matplotlib.pyplot as plt
#import seaborn
%matplotlib inline

# the OP's data
x = pandas.read_csv('http://pastebin.com/raw.php?i=ksM4FvZS', skiprows=2, header=None).values
y = pandas.read_csv('http://pastebin.com/raw.php?i=0WhjjMkb', skiprows=2, header=None).values
fig, ax = plt.subplots()
ax.plot(x, y)

enter image description here

Swap x and y axis without manually swapping values

Microsoft Excel for Mac 2011 v 14.5.9

Click on the chart
Press the "Switch Plot" button under the "Charts" tab

Composer Update Laravel

You can use :

composer self-update --2

To update to 2.0.8 version (Latest stable version)

SEVERE: Unable to create initial connections of pool - tomcat 7 with context.xml file

I use sprint-boot (2.1.1), and mysql version is 8.0.13. I add dependency in pom, solve my problem.

 <dependency>
      <groupId>mysql</groupId>
      <artifactId>mysql-connector-java</artifactId>
      <version>8.0.13</version>
 </dependency>

MySQL Connector/J » 8.0.13 link: https://mvnrepository.com/artifact/mysql/mysql-connector-java/8.0.13
MySQL Connector/J » All the version link: https://mvnrepository.com/artifact/mysql/mysql-connector-java

Install Visual Studio 2013 on Windows 7

your log files shows it is stopping on error "0x8004C000"

From MS Website (http://social.technet.microsoft.com/wiki/contents/articles/15716.visual-studio-2012-and-the-error-code-2147205120.aspx):

Setup Status
Block

Restart not required
0x80044000 [-2147205120]

Restart required
0x8004C000 [-2147172352]

Description
If the only block to be reported is “Reboot Pending,” the returned value is the Incomplete-Reboot Required value (0x80048bc7).

Can not deserialize instance of java.lang.String out of START_OBJECT token

This way I solved my problem. Hope it helps others. In my case I created a class, a field, their getter & setter and then provide the object instead of string.

Use this

public static class EncryptedData {
    private String encryptedData;

    public String getEncryptedData() {
        return encryptedData;
    }

    public void setEncryptedData(String encryptedData) {
        this.encryptedData = encryptedData;
    }
}

@PutMapping(value = MY_IP_ADDRESS)
public ResponseEntity<RestResponse> updateMyIpAddress(@RequestBody final EncryptedData encryptedData) {
    try {
        Path path = Paths.get(PUBLIC_KEY);
        byte[] bytes = Files.readAllBytes(path);
        PKCS8EncodedKeySpec ks = new PKCS8EncodedKeySpec(base64.decode(bytes));
        PrivateKey privateKey = KeyFactory.getInstance(CRYPTO_ALGO_RSA).generatePrivate(ks);

        Cipher cipher = Cipher.getInstance(CRYPTO_ALGO_RSA);
        cipher.init(Cipher.PRIVATE_KEY, privateKey);
        String decryptedData = new String(cipher.doFinal(encryptedData.getEncryptedData().getBytes()));
        String[] dataArray = decryptedData.split("|");


        Method updateIp = Class.forName("com.cuanet.client.helper").getMethod("methodName", String.class,String.class);
        updateIp.invoke(null, dataArray[0], dataArray[1]);

    } catch (Exception e) {
        LOG.error("Unable to update ip address for encrypted data: "+encryptedData, e);
    }

    return null;

Instead of this

@PutMapping(value = MY_IP_ADDRESS)
public ResponseEntity<RestResponse> updateMyIpAddress(@RequestBody final EncryptedData encryptedData) {
    try {
        Path path = Paths.get(PUBLIC_KEY);
        byte[] bytes = Files.readAllBytes(path);
        PKCS8EncodedKeySpec ks = new PKCS8EncodedKeySpec(base64.decode(bytes));
        PrivateKey privateKey = KeyFactory.getInstance(CRYPTO_ALGO_RSA).generatePrivate(ks);

        Cipher cipher = Cipher.getInstance(CRYPTO_ALGO_RSA);
        cipher.init(Cipher.PRIVATE_KEY, privateKey);
        String decryptedData = new String(cipher.doFinal(encryptedData.getBytes()));
        String[] dataArray = decryptedData.split("|");


        Method updateIp = Class.forName("com.cuanet.client.helper").getMethod("methodName", String.class,String.class);
        updateIp.invoke(null, dataArray[0], dataArray[1]);

    } catch (Exception e) {
        LOG.error("Unable to update ip address for encrypted data: "+encryptedData, e);
    }

    return null;
}

The APR based Apache Tomcat Native library was not found on the java.library.path

not found on the java.library.path: /usr/java/packages/lib/amd64:/usr/lib64:/lib64:/lib:/usr/lib

The native lib is expected in one of the following locations

/usr/java/packages/lib/amd64
/usr/lib64
/lib64
/lib
/usr/lib

and not in

tomcat/lib

The files in tomcat/lib are all jar file and are added by tomcat to the classpath so that they are available to your application.

The native lib is needed by tomcat to perform better on the platform it is installed on and thus cannot be a jar, for linux it could be a .so file, for windows it could be a .dll file.

Just download the native library for your platform and place it in the one of the locations tomcat is expecting it to be.

Note that you are not required to have this lib for development/test purposes. Tomcat runs just fine without it.

org.apache.catalina.startup.Catalina start INFO: Server startup in 2882 ms

EDIT

The output you are getting is very normal, it's just some logging outputs from tomcat, the line right above indicates that the server correctly started and is ready for operating.

If you are troubling with running your servlet then after the run on sever command eclipse opens a browser window (embeded (default) or external, depends on your config). If nothing shows on the browser, then check the url bar of the browser to see whether your servlet was requested or not.

It should be something like that

http://localhost:8080/<your-context-name>/<your-servlet-name>

EDIT 2

Try to call your servlet using the following url

http://localhost:8080/com.filecounter/FileCounter

Also each web project has a web.xml, you can find it in your project under WebContent\WEB-INF.

It is better to configure your servlets there using servlet-name servlet-class and url-mapping. It could look like that:

  <servlet>
    <description></description>
    <display-name>File counter - My first servlet</display-name>
    <servlet-name>file_counter</servlet-name>
    <servlet-class>com.filecounter.FileCounter</servlet-class>
  </servlet>

  <servlet-mapping>
    <servlet-name>file_counter</servlet-name>
    <url-pattern>/FileFounter</url-pattern>
  </servlet-mapping>

In eclipse dynamic web project the default context name is the same as your project name.

http://localhost:8080/<your-context-name>/FileCounter

will work too.

The POM for project is missing, no dependency information available

Change:

<!-- ANT4X -->
<dependency>
  <groupId>net.sourceforge</groupId>
  <artifactId>ant4x</artifactId>
  <version>${net.sourceforge.ant4x-version}</version>
  <scope>provided</scope>
</dependency>

To:

<!-- ANT4X -->
<dependency>
  <groupId>net.sourceforge.ant4x</groupId>
  <artifactId>ant4x</artifactId>
  <version>${net.sourceforge.ant4x-version}</version>
  <scope>provided</scope>
</dependency>

The groupId of net.sourceforge was incorrect. The correct value is net.sourceforge.ant4x.

Getting error: Peer authentication failed for user "postgres", when trying to get pgsql working with rails

I had the same problem.

The solution from depa is absolutely correct.

Just make sure that u have a user configured to use PostgreSQL.

Check the file:

$ ls /etc/postgresql/9.1/main/pg_hba.conf -l

The permission of this file should be given to the user you have registered your psql with.

Further. If you are good till now..

Update as per @depa's instructions.

i.e.

$ sudo nano /etc/postgresql/9.1/main/pg_hba.conf

and then make changes.

$apply already in progress error

I call $scope.$apply like this to ignored call multiple in one times.

      var callApplyTimeout = null;
      function callApply(callback) {
          if (!callback) callback = function () { };
          if (callApplyTimeout) $timeout.cancel(callApplyTimeout);

          callApplyTimeout = $timeout(function () {
              callback();
              $scope.$apply();
              var d = new Date();
              var m = d.getMilliseconds();
              console.log('$scope.$apply(); call ' + d.toString() + ' ' + m);
          }, 300);
      }

simply call

callApply();

Grouped bar plot in ggplot

First you need to get the counts for each category, i.e. how many Bads and Goods and so on are there for each group (Food, Music, People). This would be done like so:

raw <- read.csv("http://pastebin.com/raw.php?i=L8cEKcxS",sep=",")
raw[,2]<-factor(raw[,2],levels=c("Very Bad","Bad","Good","Very Good"),ordered=FALSE)
raw[,3]<-factor(raw[,3],levels=c("Very Bad","Bad","Good","Very Good"),ordered=FALSE)
raw[,4]<-factor(raw[,4],levels=c("Very Bad","Bad","Good","Very Good"),ordered=FALSE)

raw=raw[,c(2,3,4)] # getting rid of the "people" variable as I see no use for it

freq=table(col(raw), as.matrix(raw)) # get the counts of each factor level

Then you need to create a data frame out of it, melt it and plot it:

Names=c("Food","Music","People")     # create list of names
data=data.frame(cbind(freq),Names)   # combine them into a data frame
data=data[,c(5,3,1,2,4)]             # sort columns

# melt the data frame for plotting
data.m <- melt(data, id.vars='Names')

# plot everything
ggplot(data.m, aes(Names, value)) +   
  geom_bar(aes(fill = variable), position = "dodge", stat="identity")

Is this what you're after?

enter image description here

To clarify a little bit, in ggplot multiple grouping bar you had a data frame that looked like this:

> head(df)
  ID Type Annee X1PCE X2PCE X3PCE X4PCE X5PCE X6PCE
1  1    A  1980   450   338   154    36    13     9
2  2    A  2000   288   407   212    54    16    23
3  3    A  2020   196   434   246    68    19    36
4  4    B  1980   111   326   441    90    21    11
5  5    B  2000    63   298   443   133    42    21
6  6    B  2020    36   257   462   162    55    30

Since you have numerical values in columns 4-9, which would later be plotted on the y axis, this can be easily transformed with reshape and plotted.

For our current data set, we needed something similar, so we used freq=table(col(raw), as.matrix(raw)) to get this:

> data
   Names Very.Bad Bad Good Very.Good
1   Food        7   6    5         2
2  Music        5   5    7         3
3 People        6   3    7         4

Just imagine you have Very.Bad, Bad, Good and so on instead of X1PCE, X2PCE, X3PCE. See the similarity? But we needed to create such structure first. Hence the freq=table(col(raw), as.matrix(raw)).

TypeError: 'undefined' is not an object

I'm not sure how you could just check if something isn't undefined and at the same time get an error that it is undefined. What browser are you using?

You could check in the following way (extra = and making length a truthy evaluation)

if (typeof(sub.from) !== 'undefined' && sub.from.length) {

[update]

I see that you reset sub and thereby reset sub.from but fail to re check if sub.from exist:

for (var i = 0; i < sub.from.length; i++) {//<== assuming sub.from.exist
            mainid = sub.from[i]['id'];
            var sub = afcHelper_Submissions[mainid]; // <== re setting sub

My guess is that the error is not on the if statement but on the for(i... statement. In Firebug you can break automatically on an error and I guess it'll break on that line (not on the if statement).

Uncaught ReferenceError: function is not defined with onclick

Never use .onclick(), or similar attributes from a userscript! (It's also poor practice in a regular web page).

The reason is that userscripts operate in a sandbox ("isolated world"), and onclick operates in the target-page scope and cannot see any functions your script creates.

Always use addEventListener()^Doc (or an equivalent library function, like jQuery .on()).

So instead of code like:

something.outerHTML += '<input onclick="resetEmotes()" id="btnsave" ...>'

You would use:

something.outerHTML += '<input id="btnsave" ...>'

document.getElementById ("btnsave").addEventListener ("click", resetEmotes, false);

For the loop, you can't pass data to an event listener like that See the doc. Plus every time you change innerHTML like that, you destroy the previous event listeners!

Without refactoring your code much, you can pass data with data attributes. So use code like this:

for (i = 0; i < EmoteURLLines.length; i++) {
    if (checkIMG (EmoteURLLines[i])) {
        localStorage.setItem ("nameEmotes", JSON.stringify (EmoteNameLines));
        localStorage.setItem ("urlEmotes", JSON.stringify (EmoteURLLines));
        localStorage.setItem ("usageEmotes", JSON.stringify (EmoteUsageLines));
        if (i == 0) {
            console.log (resetSlot ());
        }
        emoteTab[2].innerHTML  += '<span style="cursor:pointer;" id="' 
                                + EmoteNameLines[i] 
                                + '" data-usage="' + EmoteUsageLines[i] + '">'
                                + '<img src="' + EmoteURLLines[i] + '" /></span>'
                                ;
    } else {
        alert ("The maximum emote (" + EmoteNameLines[i] + ") size is (36x36)");
    }
}
//-- Only add events when innerHTML overwrites are done.
var targetSpans = emoteTab[2].querySelectorAll ("span[data-usage]");
for (var J in targetSpans) {
    targetSpans[J].addEventListener ("click", appendEmote, false);
}

Where appendEmote is like:

function appendEmote (zEvent) {
    //-- this and the parameter are special in event handlers.  see the linked doc.
    var emoteUsage  = this.getAttribute ("data-usage");
    shoutdata.value += emoteUsage;
}

WARNINGS:

Your code reuses the same id for several elements. Don't do this, it's invalid. A given ID should occur only once per page.
Every time you use .outerHTML or .innerHTML, you trash any event handlers on the affected nodes. If you use this method beware of that fact.

Maven compile: package does not exist

Not sure if there was file corruption or what, but after confirming proper pom configuration I was able to resolve this issue by deleting the jar from my local m2 repository, forcing Maven to download it again when I ran the tests.

Linq: GroupBy, Sum and Count

sometimes you need to select some fields by FirstOrDefault() or singleOrDefault() you can use the below query:

List<ResultLine> result = Lines
    .GroupBy(l => l.ProductCode)
    .Select(cl => new Models.ResultLine
            {
                ProductName = cl.select(x=>x.Name).FirstOrDefault(),
                Quantity = cl.Count().ToString(),
                Price = cl.Sum(c => c.Price).ToString(),
            }).ToList();

Creating a Shopping Cart using only HTML/JavaScript

Here's a one page cart written in Javascript with localStorage. Here's a full working pen. Previously found on Codebox

cart.js

var cart = {
  // (A) PROPERTIES
  hPdt : null, // HTML products list
  hItems : null, // HTML current cart
  items : {}, // Current items in cart

  // (B) LOCALSTORAGE CART
  // (B1) SAVE CURRENT CART INTO LOCALSTORAGE
  save : function () {
    localStorage.setItem("cart", JSON.stringify(cart.items));
  },

  // (B2) LOAD CART FROM LOCALSTORAGE
  load : function () {
    cart.items = localStorage.getItem("cart");
    if (cart.items == null) { cart.items = {}; }
    else { cart.items = JSON.parse(cart.items); }
  },

  // (B3) EMPTY ENTIRE CART
  nuke : function () {
    if (confirm("Empty cart?")) {
      cart.items = {};
      localStorage.removeItem("cart");
      cart.list();
    }
  },

  // (C) INITIALIZE
  init : function () {
    // (C1) GET HTML ELEMENTS
    cart.hPdt = document.getElementById("cart-products");
    cart.hItems = document.getElementById("cart-items");

    // (C2) DRAW PRODUCTS LIST
    cart.hPdt.innerHTML = "";
    let p, item, part;
    for (let id in products) {
      // WRAPPER
      p = products[id];
      item = document.createElement("div");
      item.className = "p-item";
      cart.hPdt.appendChild(item);

      // PRODUCT IMAGE
      part = document.createElement("img");
      part.src = "images/" +p.img;
      part.className = "p-img";
      item.appendChild(part);

      // PRODUCT NAME
      part = document.createElement("div");
      part.innerHTML = p.name;
      part.className = "p-name";
      item.appendChild(part);

      // PRODUCT DESCRIPTION
      part = document.createElement("div");
      part.innerHTML = p.desc;
      part.className = "p-desc";
      item.appendChild(part);

      // PRODUCT PRICE
      part = document.createElement("div");
      part.innerHTML = "$" + p.price;
      part.className = "p-price";
      item.appendChild(part);

      // ADD TO CART
      part = document.createElement("input");
      part.type = "button";
      part.value = "Add to Cart";
      part.className = "cart p-add";
      part.onclick = cart.add;
      part.dataset.id = id;
      item.appendChild(part);
    }

    // (C3) LOAD CART FROM PREVIOUS SESSION
    cart.load();

    // (C4) LIST CURRENT CART ITEMS
    cart.list();
  },

  // (D) LIST CURRENT CART ITEMS (IN HTML)
  list : function () {
    // (D1) RESET
    cart.hItems.innerHTML = "";
    let item, part, pdt;
    let empty = true;
    for (let key in cart.items) {
      if(cart.items.hasOwnProperty(key)) { empty = false; break; }
    }

    // (D2) CART IS EMPTY
    if (empty) {
      item = document.createElement("div");
      item.innerHTML = "Cart is empty";
      cart.hItems.appendChild(item);
    }

    // (D3) CART IS NOT EMPTY - LIST ITEMS
    else {
      let p, total = 0, subtotal = 0;
      for (let id in cart.items) {
        // ITEM
        p = products[id];
        item = document.createElement("div");
        item.className = "c-item";
        cart.hItems.appendChild(item);

        // NAME
        part = document.createElement("div");
        part.innerHTML = p.name;
        part.className = "c-name";
        item.appendChild(part);

        // REMOVE
        part = document.createElement("input");
        part.type = "button";
        part.value = "X";
        part.dataset.id = id;
        part.className = "c-del cart";
        part.addEventListener("click", cart.remove);
        item.appendChild(part);

        // QUANTITY
        part = document.createElement("input");
        part.type = "number";
        part.value = cart.items[id];
        part.dataset.id = id;
        part.className = "c-qty";
        part.addEventListener("change", cart.change);
        item.appendChild(part);

        // SUBTOTAL
        subtotal = cart.items[id] * p.price;
        total += subtotal;
      }

      // EMPTY BUTTONS
      item = document.createElement("input");
      item.type = "button";
      item.value = "Empty";
      item.addEventListener("click", cart.nuke);
      item.className = "c-empty cart";
      cart.hItems.appendChild(item);

      // CHECKOUT BUTTONS
      item = document.createElement("input");
      item.type = "button";
      item.value = "Checkout - " + "$" + total;
      item.addEventListener("click", cart.checkout);
      item.className = "c-checkout cart";
      cart.hItems.appendChild(item);
    }
  },

  // (E) ADD ITEM INTO CART
  add : function () {
    if (cart.items[this.dataset.id] == undefined) {
      cart.items[this.dataset.id] = 1;
    } else {
      cart.items[this.dataset.id]++;
    }
    cart.save();
    cart.list();
  },

  // (F) CHANGE QUANTITY
  change : function () {
    if (this.value == 0) {
      delete cart.items[this.dataset.id];
    } else {
      cart.items[this.dataset.id] = this.value;
    }
    cart.save();
    cart.list();
  },
  
  // (G) REMOVE ITEM FROM CART
  remove : function () {
    delete cart.items[this.dataset.id];
    cart.save();
    cart.list();
  },
  
  // (H) CHECKOUT
  checkout : function () {
    // SEND DATA TO SERVER
    // CHECKS
    // SEND AN EMAIL
    // RECORD TO DATABASE
    // PAYMENT
    // WHATEVER IS REQUIRED
    alert("TO DO");

    /*
    var data = new FormData();
    data.append('cart', JSON.stringify(cart.items));
    data.append('products', JSON.stringify(products));
    var xhr = new XMLHttpRequest();
    xhr.open("POST", "SERVER-SCRIPT");
    xhr.onload = function(){ ... };
    xhr.send(data);
    */
  }
};
window.addEventListener("DOMContentLoaded", cart.init);

Invalid column count in CSV input on line 1 Error

Fixed! I basically just selected "Import" without even making a table myself. phpMyAdmin created the table for me, with all the right column names, from the original document.

Parse error: syntax error, unexpected T_ECHO in

Missing ; after var_dump($row)

Convert Base64 string to an image file?

You need to remove the part that says data:image/png;base64, at the beginning of the image data. The actual base64 data comes after that.

Just strip everything up to and including base64, (before calling base64_decode() on the data) and you'll be fine.

Java SSLHandshakeException "no cipher suites in common"

It looks like you are trying to connect using TLSv1.2, which isn't widely implemented on servers. Does your destination support tls1.2?

How to display binary data as image - extjs 4

In ExtJs, you can use

xtype: 'image'

to render a image.

Here is a fiddle showing rendering of binary data with extjs.

atob -- > converts ascii to binary

btoa -- > converts binary to ascii

Ext.application({
    name: 'Fiddle',

    launch: function () {
        var srcBase64 = "data:image/jpeg;base64," + btoa(atob("iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAADUlEQVR42mP8H8hYDwAFegHS8+X7mgAAAABJRU5ErkJggg=="));

        Ext.create("Ext.panel.Panel", {
            title: "Test",
            renderTo: Ext.getBody(),
            height: 400,
            items: [{
                xtype: 'image',
                width: 100,
                height: 100,
                src: srcBase64
            }]
        })
    }
});

https://fiddle.sencha.com/#view/editor&fiddle/28h0

Errno 10060] A connection attempt failed because the connected party did not properly respond after a period of time

As ping works, but telnetto port 80 does not, the HTTP port 80 is closed on your machine. I assume that your browser's HTTP connection goes through a proxy (as browsing works, how else would you read stackoverflow?). You need to add some code to your python program, that handles the proxy, like described here:

Using an HTTP PROXY - Python

XAMPP Apache won't start

If you have skype shutdown and the problem still persists. Try this. It could be that apache is set to automatic on restart. Meaning apache is already using that port. Go to services in your XAMPP control and look for apache (whatever version you have). Look for startup type and double-click it to set it to manual.

Hope this works!

Fatal error: Out of memory, but I do have plenty of memory (PHP)

this happened to me a few days ago. I did a fresh installation and it still happened. as far as everyone sees and based on your server specs. most likely it is an infinite loop. it could be not on the PHP code itself but on the requests made to Apache.

lets say when you access this url http://localhost/mysite/page_with_multiple_requests

Check your Apache's access log if it receives multiple requests. trace that request and check out the code that might cause a 'bottleneck' to the system (mine's exec() when using sendmail). The bottleneck im talking about doesn't need to be an 'infinite loop'. It could be a function that takes sometime to finish. or maybe some of php's 'program execution functions'

You might need to check ajax requests too (the ones that execute when the page loads). if that ajax request redirects to the same url

e.g. httpx://localhost/mysite/page_with_multiple_requests

it would 'redo' the requests all over again

it would help if you post the random lines or the code itself where the script ends maybe there is a 'loop' code somewhere there. imho php won't just call random lines for nothing.

http://blog.piratelufi.com/2012/08/browser-sending-multiple-requests-at-once/

Javascript : calling function from another file

Yes you can. Just check my fiddle for clarification. For demo purpose i kept the code in fiddle at same location. You can extract that code as shown in two different Javascript files and load them in html file.

https://jsfiddle.net/mvora/mrLmkxmo/

 /******** PUT THIS CODE IN ONE JS FILE *******/

    var secondFileFuntion = function(){
        this.name = 'XYZ';
    }

    secondFileFuntion.prototype.getSurname = function(){
     return 'ABC';
    }


    var secondFileObject = new secondFileFuntion();

    /******** Till Here *******/

    /******** PUT THIS CODE IN SECOND JS FILE *******/

    function firstFileFunction(){
      var name = secondFileObject.name;
      var surname = secondFileObject.getSurname()
      alert(name);
      alert(surname );
    }

    firstFileFunction();

If you make an object using the constructor function and trying access the property or method from it in second file, it will give you the access of properties which are present in another file.

Just take care of sequence of including these files in index.html

Unstaged changes left after git reset --hard

For some reason

git add .

didn't work, but

$ git add -A

worked out!

Very Simple, Very Smooth, JavaScript Marquee

Responsive resist jQuery marquee simple plugin. Tutorial:

// start plugin
    (function($){
        $.fn.marque = function(options, callback){

            // check callback

            if(typeof callback == 'function'){
                callback.call(this);
            } else{
                console.log("second argument (callback) is not a function");
                // throw "callback must be a function"; //only if callback for some reason is required
                // return this; //only if callback for some reason is required
            }

            //set and overwrite default functions
            var defOptions = $.extend({
                speedPixelsInOneSecound: 150, //speed will behave same for different screen where duration will be different for each size of the screen
                select: $('.message div'),
                clickSelect: '', // selector that on click will redirect user ... (optional)
                clickUrl: '' //... to this url. (optional)
            }, options);

            //Run marque plugin
            var windowWidth = $(window).width();
            var textWidth = defOptions.select.outerWidth();
            var duration = (windowWidth + textWidth) * 1000 / defOptions.speedPixelsInOneSecound;
            var startingPosition = (windowWidth + textWidth);
            var curentPosition = (windowWidth + textWidth);
            var speedProportionToLocation = curentPosition / startingPosition;
            defOptions.select.css({'right': -(textWidth)});
            defOptions.select.show();
            var animation;


            function marquee(animation){
                curentPosition = (windowWidth + defOptions.select.outerWidth());
                speedProportionToLocation = curentPosition / startingPosition;
                animation = defOptions.select.animate({'right': windowWidth+'px'}, duration * speedProportionToLocation, "linear", function(){
                     defOptions.select.css({'right': -(textWidth)});
                });
            }
            var play = setInterval(marquee, 200);

            //add onclick behaviour
            if(defOptions.clickSelect != '' && defOptions.clickUrl != ''){
                defOptions.clickSelect.click(function(){
                    window.location.href = defOptions.clickUrl;
                });
            }
            return this;
        };

    }(jQuery)); 
// end plugin

Use this custom jQuery plugin as bellow:

//use example
$(window).marque({
    speedPixelsInOneSecound: 150, // spped pixels/secound
    select: $('.message div'), // select an object on which you want to apply marquee effects.
    clickSelect: $('.message'), // select clicable object (optional)
    clickUrl: 'services.php' // define redirection url (optional)
});

JTable - Selected Row click event

 private void jTable1MouseClicked(java.awt.event.MouseEvent evt) {                                     
     JTable source = (JTable)evt.getSource();
            int row = source.rowAtPoint( evt.getPoint() );
            int column = source.columnAtPoint( evt.getPoint() );
            String s=source.getModel().getValueAt(row, column)+"";

            JOptionPane.showMessageDialog(null, s);


}

if you want click cell or row in jtable use this way

Moving matplotlib legend outside of the axis makes it cutoff by the figure box

Sorry EMS, but I actually just got another response from the matplotlib mailling list (Thanks goes out to Benjamin Root).

The code I am looking for is adjusting the savefig call to:

fig.savefig('samplefigure', bbox_extra_artists=(lgd,), bbox_inches='tight')
#Note that the bbox_extra_artists must be an iterable

This is apparently similar to calling tight_layout, but instead you allow savefig to consider extra artists in the calculation. This did in fact resize the figure box as desired.

import matplotlib.pyplot as plt
import numpy as np

plt.gcf().clear()
x = np.arange(-2*np.pi, 2*np.pi, 0.1)
fig = plt.figure(1)
ax = fig.add_subplot(111)
ax.plot(x, np.sin(x), label='Sine')
ax.plot(x, np.cos(x), label='Cosine')
ax.plot(x, np.arctan(x), label='Inverse tan')
handles, labels = ax.get_legend_handles_labels()
lgd = ax.legend(handles, labels, loc='upper center', bbox_to_anchor=(0.5,-0.1))
text = ax.text(-0.2,1.05, "Aribitrary text", transform=ax.transAxes)
ax.set_title("Trigonometry")
ax.grid('on')
fig.savefig('samplefigure', bbox_extra_artists=(lgd,text), bbox_inches='tight')

This produces:

[edit] The intent of this question was to completely avoid the use of arbitrary coordinate placements of arbitrary text as was the traditional solution to these problems. Despite this, numerous edits recently have insisted on putting these in, often in ways that led to the code raising an error. I have now fixed the issues and tidied the arbitrary text to show how these are also considered within the bbox_extra_artists algorithm.

Binary Data Posting with curl

You don't need --header "Content-Length: $LENGTH".

curl --request POST --data-binary "@template_entry.xml" $URL

Note that GET request does not support content body widely.

Also remember that POST request have 2 different coding schema. This is first form:

  $ nc -l -p 6666 &
  $ curl  --request POST --data-binary "@README" http://localhost:6666

POST / HTTP/1.1
User-Agent: curl/7.21.0 (x86_64-pc-linux-gnu) libcurl/7.21.0 OpenSSL/0.9.8o zlib/1.2.3.4 libidn/1.15 libssh2/1.2.6
Host: localhost:6666
Accept: */*
Content-Length: 9309
Content-Type: application/x-www-form-urlencoded
Expect: 100-continue

.. -*- mode: rst; coding: cp1251; fill-column: 80 -*-
.. rst2html.py README README.html
.. contents::

You probably request this:

-F/--form name=content
           (HTTP) This lets curl emulate a filled-in form in
              which a user has pressed the submit button. This
              causes curl to POST data using the Content- Type
              multipart/form-data according to RFC2388. This
              enables uploading of binary files etc. To force the
              'content' part to be a file, prefix the file name
              with an @ sign. To just get the content part from a
              file, prefix the file name with the symbol <. The
              difference between @ and < is then that @ makes a
              file get attached in the post as a file upload,
              while the < makes a text field and just get the
              contents for that text field from a file.

Can not connect to local PostgreSQL

Hello world :)
The best but strange way for me was to do next things.

1) Download postgres93.app or other version. Add this app into /Applications/ folder.

2) Add a row (command) into the file .bash_profile (which is in my home directory):

export PATH=/Applications/Postgres93.app/Contents/MacOS/bin/:$PATH

It's a PATH to psql from Postgres93.app. The row (command) runs every time console is started.

3) Launch Postgres93.app from /Applications/ folder. It starts a local server (port is "5432" and host is "localhost").

4) After all of this manipulations I was glad to run $ createuser -SRDP user_name and other commands and to see that it worked! Postgres93.app can be made to run every time your system starts.

5) Also if you wanna see your databases graphically you should install PG Commander.app. It's good way to see your postgres DB as pretty data-tables

Of, course, it's helpful only for local server. I will be glad if this instructions help others who has faced with this problem.

Android: show/hide status bar/power bar

 @Override
 protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    //hide status bar
    requestWindowFeature( Window.FEATURE_NO_TITLE );
    getWindow().setFlags( WindowManager.LayoutParams.FLAG_FULLSCREEN,
            WindowManager.LayoutParams.FLAG_FULLSCREEN );


    setContentView(R.layout.activity_main);
}

Adding timestamp to a filename with mv in BASH

Well, it's not a direct answer to your question, but there's a tool in GNU/Linux whose job is to rotate log files on regular basis, keeping old ones zipped up to a certain limit. It's logrotate

Could not find an implementation of the query pattern

For those of you (like me) that wasted too much time from this error:

I had received the same error: "Could not find implementation of query Pattern for source type 'DbSet'" but the solution for me was fixing a mistake at the DbContext level.

When I created my context I had this:

public class ContactContext : DbContext
    {
        public ContactContext() : base() { }

        public DbSet Contacts { get; set; }
    }

And my Repository (I was following a Repository pattern in ASP.NET guide) looked like this:

public Contact FindById(int id)
    {       
        var contact = from c in _db.Contacts where c.Id == id select c;
        return contact;
    }

My issue came from the initial setup of my DbContext, when I used DbSet as a generic instead of the type.

I changed public DbSet Contacts { get; set; } to public DbSet<Contact> Contacts { get; set; } and suddenly the query was recognized.

This is probably what k.m says in his answer, but since he mentioned IEnumerable<t> and not DbSet<<YourDomainObject>> I had to dig around in the code for a couple hours to find the line that caused this headache.

Python: maximum recursion depth exceeded while calling a Python object

Instead of doing recursion, the parts of the code with checkNextID(ID + 18) and similar could be replaced with ID+=18, and then if you remove all instances of return 0, then it should do the same thing but as a simple loop. You should then put a return 0 at the end and make your variables non-global.

Removing all script tags from html with JS Regular Expression

jQuery uses a regex to remove script tags in some cases and I'm pretty sure its devs had a damn good reason to do so. Probably some browser does execute scripts when inserting them using innerHTML.

Here's the regex:

/<script\b[^<]*(?:(?!<\/script>)<[^<]*)*<\/script>/gi

And before people start crying "but regexes for HTML are evil": Yes, they are - but for script tags they are safe because of the special behaviour - a <script> section may not contain </script> at all unless it should end at this position. So matching it with a regex is easily possible. However, from a quick look the regex above does not account for trailing whitespace inside the closing tag so you'd have to test if </script etc. will still work.

How do I compile a .cpp file on Linux?

The compiler is telling you that there are problems starting at line 122 in the middle of that strange FBI-CIA warning message. That message is not valid C++ code and is NOT commented out so of course it will cause compiler errors. Try removing that entire message.

Also, I agree with In silico: you should always tell us what you tried and exactly what error messages you got.

Disable Buttons in jQuery Mobile

I created a widget that can completely disable or present a read-only view of the content on your page. It disables all buttons, anchors, removes all click events, etc., and can re-enable them all back again. It even supports all jQuery UI widgets as well. I created it for an application I wrote at work. You're free to use it.

Check it out at ( http://www.dougestep.com/dme/jquery-disabler-widget ).

Fast and Lean PDF Viewer for iPhone / iPad / iOS - tips and hints?

For a simple and effective PDF viewer, when you require only limited functionality, you can now (iOS 4.0+) use the QuickLook framework:

First, you need to link against QuickLook.framework and #import <QuickLook/QuickLook.h>;

Afterwards, in either viewDidLoad or any of the lazy initialization methods:

QLPreviewController *previewController = [[QLPreviewController alloc] init];
previewController.dataSource = self;
previewController.delegate = self;
previewController.currentPreviewItemIndex = indexPath.row;
[self presentModalViewController:previewController animated:YES];
[previewController release];

Performance of FOR vs FOREACH in PHP

I think but I am not sure : the for loop takes two operations for checking and incrementing values. foreach loads the data in memory then it will iterate every values.

What's is the difference between train, validation and test set, in neural networks?

Training Dataset: The sample of data used to fit the model.

Validation Dataset: The sample of data used to provide an unbiased evaluation of a model fit on the training dataset while tuning model hyperparameters. The evaluation becomes more biased as skill on the validation dataset is incorporated into the model configuration.

Test Dataset: The sample of data used to provide an unbiased evaluation of a final model fit on the training dataset.

MySQL SELECT x FROM a WHERE NOT IN ( SELECT x FROM b ) - Unexpected result

I'm a little out of touch with the details of how MySQL deals with nulls, but here's two things to try:

SELECT * FROM match WHERE id NOT IN 
    ( SELECT id FROM email WHERE id IS NOT NULL) ;

SELECT
    m.*
FROM
    match m
    LEFT OUTER JOIN email e ON
        m.id = e.id
        AND e.id IS NOT NULL
WHERE
    e.id IS NULL

The second query looks counter intuitive, but it does the join condition and then the where condition. This is the case where joins and where clauses are not equivalent.

MySQL joins and COUNT(*) from another table

SELECT DISTINCT groups.id, 
       (SELECT COUNT(*) FROM group_members
        WHERE member_id = groups.id) AS memberCount
FROM groups

how to call a method in another Activity from Activity

The startActivityForResult pattern is much better suited for what you're trying to achieve : http://developer.android.com/reference/android/app/Activity.html#StartingActivities

Try below code

public class MainActivity extends Activity {  

    Button button1;  
    @Override  
    protected void onCreate(Bundle savedInstanceState) {  
        super.onCreate(savedInstanceState);  
        setContentView(R.layout.activity_main);  
        textView1=(TextView)findViewById(R.id.textView1);  
        button1=(Button)findViewById(R.id.button1);  
        button1.setOnClickListener(new OnClickListener() {  
            @Override  
            public void onClick(View arg0) {  
                Intent intent=new Intent(MainActivity.this,SecondActivity.class);  
                startActivityForResult(intent, 2);// Activity is started with requestCode 2  
            }  
        });  
    }  
 // Call Back method  to get the Message form other Activity  
    @Override  
       protected void onActivityResult(int requestCode, int resultCode, Intent data)  
       {  
                 super.onActivityResult(requestCode, resultCode, data);  
                  // check if the request code is same as what is passed  here it is 2  
                   if(requestCode==2)  
                         {  
                          //do the things u wanted 
                         }  
     }  

}

SecondActivity.class

public class SecondActivity extends Activity {  

    Button button1;  
    @Override  
    protected void onCreate(Bundle savedInstanceState) {  
        super.onCreate(savedInstanceState);  
        setContentView(R.layout.activity_second);  

            button1=(Button)findViewById(R.id.button1);  
            button1.setOnClickListener(new OnClickListener() {  
                @Override  
                public void onClick(View arg0) {  
                    String message="hello ";  
                    Intent intent=new Intent();  
                    intent.putExtra("MESSAGE",message);  
                    setResult(2,intent);  
                    finish();//finishing activity  
                }  
            });  
    }  

}

Let me know if it helped...

Command CompileSwift failed with a nonzero exit code in Xcode 10

For me, the error message said I had too many simulator files open to build Swift. When I quit the simulator and built again, everything worked.

How to get your Netbeans project into Eclipse

One other easy way of doing it would be as follows (if you have a simple NetBeans project and not using maven for example).

In Eclipse, Go to File -> New -> Java Project
Give a name for your project and click finish to create your project
When the project is created find the source folder in NetBeans project, drag and drop all the source files from the NetBeans project to 'src' folder of your new created project in eclipse.
Move the java source files to respective package (if required)
Now you should be able to run your NetBeans project in Eclipse.

how to fix EXE4J_JAVA_HOME, No JVM could be found on your system error?

There are few steps to overcome this problem:

Uninstall Java related softwares
Uninstall NodeJS if installed
Download java 8 update161
Install it

The problem solved: The problem raised to me at the uninstallation on openfire server.

CSS3's border-radius property and border-collapse:collapse don't mix. How can I use border-radius to create a collapsed table with rounded corners?

I always do this way using Sass

table {
  border-radius: 0.25rem;
  thead tr:first-child th {
    &:first-child {
      border-top-left-radius: 0.25rem;
    }
    &:last-child {
      border-top-right-radius: 0.25rem;
    }
  }
  tbody tr:last-child td {
    &:first-child {
      border-bottom-left-radius: 0.25rem;
    }
    &:last-child {
      border-bottom-right-radius: 0.25rem;
    }
  }
}

Convert HTML + CSS to PDF

In terms of cost, using a web-service (API) may in many cases be the more sensible approach. Plus, by outsourcing this process you unburden your own infrastructure/backend and - provided you are using a reputable service - ensure compatibility with adjusting web standards, uptime, short processing times and quick content delivery.

I've done some research on most of the web services currently on the market, please find below the APIs that I feel are worth mentioning on this thread, in an order based on price/value ratio. All of them are offering pre-composed PHP classes and packages.

pdflayer.com - Cost: $ - Quality: ????
docraptor.com - Cost: $$$ - Quality: ?????
pdfcrowd.com - Cost: $$ - Quality: ???

Quality:

Having the high-quality engine PrinceXML as a backbone, DocRaptor clearly offers the best PDF quality, returning highly polished and well converted PDF documents. However, the pdflayer API service gets pretty close here. Pdfcrowd does not necessarily score with quality, but with processing speed.

Cost:

pdflayer.com - As indicated above, the most cost-effective option here is pdflayer.com, offering an entirely free subscription plan for 100 monthly PDFs and premium subscriptions ranging between $9.99-$119.99. The price for 10,000 monthly PDF documents is $39.99.

docraptor.com - Offering a 7-Day Free Trial period. Premium subscription plans range from $15-$2250. The price for 10,000 monthly PDF documents is ~ $300.00.

pdfcrowd.com - Offering 100 PDFs once for free. Premium subscription plans range from $9-$89. The price for 10,000 monthly PDF documents is ~ $49.00.

I've used all three of them and this text is supposed to help anyone decide without having to pay for all of them. This text has not been written to endorse any one product and I have no affiliation with any of the products.

Where is the syntax for TypeScript comments documented?

TypeScript is a strict syntactical superset of JavaScript hence

Single line comments start with //
Multi-line comments start with /* and end with */

QComboBox - set selected item based on the item's data

You lookup the value of the data with findData() and then use setCurrentIndex()

QComboBox* combo = new QComboBox;
combo->addItem("100",100.0);    // 2nd parameter can be any Qt type
combo->addItem .....

float value=100.0;
int index = combo->findData(value);
if ( index != -1 ) { // -1 for not found
   combo->setCurrentIndex(index);
}

How do I make a matrix from a list of vectors in R?

t(sapply(a, '[', 1:max(sapply(a, length))))

where 'a' is a list. Would work for unequal row size

Difference between Destroy and Delete

delete will only delete current object record from db but not its associated children records from db.

destroy will delete current object record from db and also its associated children record from db.

Their use really matters:

If your multiple parent objects share common children objects, then calling destroy on specific parent object will delete children objects which are shared among other multiple parents.

How to pass arguments to addEventListener listener function?

One way is doing this with an outer function:

elem.addEventListener('click', (function(numCopy) {
  return function() {
    alert(numCopy)
  };
})(num));

This method of wrapping an anonymous function in parentheses and calling it right away is called an IIFE (Immediately-Invoked Function Expression)

You can check an example with two parameters in http://codepen.io/froucher/pen/BoWwgz.

catimg.addEventListener('click', (function(c, i){
  return function() {
    c.meows++;
    i.textContent = c.name + '\'s meows are: ' + c.meows;
  }
})(cat, catmeows));

Is there a css cross-browser value for "width: -moz-fit-content;"?

Mozilla's MDN suggests something like the following [source]:

 p {
  width: intrinsic;           /* Safari/WebKit uses a non-standard name */
  width: -moz-max-content;    /* Firefox/Gecko */
  width: -webkit-max-content; /* Chrome */
}

How to set different colors in HTML in one statement?

_x000D_

.rainbow {_x000D_
  background-image: -webkit-gradient( linear, left top, right top, color-stop(0, #f22), color-stop(0.15, #f2f), color-stop(0.3, #22f), color-stop(0.45, #2ff), color-stop(0.6, #2f2),color-stop(0.75, #2f2), color-stop(0.9, #ff2), color-stop(1, #f22) );_x000D_
  background-image: gradient( linear, left top, right top, color-stop(0, #f22), color-stop(0.15, #f2f), color-stop(0.3, #22f), color-stop(0.45, #2ff), color-stop(0.6, #2f2),color-stop(0.75, #2f2), color-stop(0.9, #ff2), color-stop(1, #f22) );_x000D_
  color:transparent;_x000D_
  -webkit-background-clip: text;_x000D_
  background-clip: text;_x000D_
}

_x000D_

<h2><span class="rainbow">Rainbows are colorful and scalable and lovely</span></h2>

_x000D_

center image in div with overflow hidden

you the have to corp your image from sides to hide it try this

3 Easy and Fast CSS Techniques for Faux Image Cropping | Css ...

one of the demo for the first way on the site above

try demo

i will do some reading on it too

Printing 1 to 1000 without loop or conditionals

#include <boost/mpl/range_c.hpp>
#include <boost/mpl/for_each.hpp>
#include <boost/lambda/lambda.hpp>
#include <iostream>

int main()
{
  boost::mpl::for_each<boost::mpl::range_c<unsigned, 1, 1001> >(std::cout << boost::lambda::_1 << '\n');
  return(0);
}

How do I invoke a Java method when given the method name as a string?

Method method = someVariable.class.getMethod(SomeClass);
String status = (String) method.invoke(method);

SomeClass is the class and someVariable is a variable.

Removing carriage return and new-line from the end of a string in c#

This will trim off any combination of carriage returns and newlines from the end of s:

s = s.TrimEnd(new char[] { '\r', '\n' });

Edit: Or as JP kindly points out, you can spell that more succinctly as:

s = s.TrimEnd('\r', '\n');

How to use border with Bootstrap

While it's probably not the correct way to do it, something that I've found to be a simple workaround is to simply use a box-shadow rather than a border... This doesn't break the grid system. For example, in your case:

HTML

<div class="container">
    <div class="row" >
        <div class="span12">
            <div class="row">
                <div class="span4">
                    1
                </div>
                <div class="span4">
                    2
                </div>
                <div class="span4">
                    3
                </div>
            </div>
        </div>
    </div>
</div>

CSS

.span12{
    -moz-box-shadow: 0 0 2px black;
    -webkit-box-shadow: 0 0 2px black;
    box-shadow: 0 0 2px black;
}

Fiddle

In Python script, how do I set PYTHONPATH?

I linux this works too:

import sys
sys.path.extend(["/path/to/dotpy/file/"])

How to set selected index JComboBox by value

Why not take a collection, likely a Map such as a HashMap, and use it as the nucleus of your own combo box model class that implements the ComboBoxModel interface? Then you could access your combo box's items easily via their key Strings rather than ints.

For instance...

import java.util.HashMap;
import java.util.Map;

import javax.swing.ComboBoxModel;
import javax.swing.event.ListDataListener;

public class MyComboModel<K, V>   implements ComboBoxModel {
   private Map<K, V> nucleus = new HashMap<K, V>();

   // ... any constructors that you want would go here

   public void put(K key, V value) {
      nucleus.put(key, value);
   }

   public V get(K key) {
      return nucleus.get(key);
   }

   @Override
   public void addListDataListener(ListDataListener arg0) {
      // TODO Auto-generated method stub

   }

   // ... plus all the other methods required by the interface
}

How can I get LINQ to return the object which has the max value for a given property?

This will loop through only once.

Item biggest = items.Aggregate((i1,i2) => i1.ID > i2.ID ? i1 : i2);

Thanks Nick - Here's the proof

class Program
{
    static void Main(string[] args)
    {
        IEnumerable<Item> items1 = new List<Item>()
        {
            new Item(){ ClientID = 1, ID = 1},
            new Item(){ ClientID = 2, ID = 2},
            new Item(){ ClientID = 3, ID = 3},
            new Item(){ ClientID = 4, ID = 4},
        };
        Item biggest1 = items1.Aggregate((i1, i2) => i1.ID > i2.ID ? i1 : i2);

        Console.WriteLine(biggest1.ID);
        Console.ReadKey();
    }


}

public class Item
{
    public int ClientID { get; set; }
    public int ID { get; set; }
}

Rearrange the list and get the same result

How do I install PIL/Pillow for Python 3.6?

For python version 2.x you can simply use

pip install pillow

But for python version 3.X you need to specify

(sudo) pip3 install pillow

when you enter pip in bash hit tab and you will see what options you have

Line break in SSRS expression

If your placeholder is in html enabled mode then "<br />" will work as a newline

Using a RegEx to match IP addresses in Python

I came across the same situation, I found the answer with use of socket library helpful but it doesn't provide support for ipv6 addresses. Found a better way for it:

Unfortunately it Works for python3 only

import ipaddress

def valid_ip(address):
    try: 
        print ipaddress.ip_address(address)
        return True
    except:
        return False

print valid_ip('10.10.20.30')
print valid_ip('2001:DB8::1')
print valid_ip('gibberish')

C# static class constructor

C# has a static constructor for this purpose.

static class YourClass
{
    static YourClass()
    {
        // perform initialization here
    }
}

From MSDN:

A static constructor is used to initialize any static data, or to perform a particular action that needs to be performed once only. It is called automatically before the first instance is created or any static members are referenced

MSDN link

How to insert multiple rows from a single query using eloquent/fluent

using Eloquent

$data = array(
    array('user_id'=>'Coder 1', 'subject_id'=> 4096),
    array('user_id'=>'Coder 2', 'subject_id'=> 2048),
    //...
);

Model::insert($data);

How can I update the current line in a C# Windows Console App?

From the Console docs in MSDN:

You can solve this problem by setting the TextWriter.NewLine property of the Out or Error property to another line termination string. For example, the C# statement, Console.Error.NewLine = "\r\n\r\n";, sets the line termination string for the standard error output stream to two carriage return and line feed sequences. Then you can explicitly call the WriteLine method of the error output stream object, as in the C# statement, Console.Error.WriteLine();

So - I did this:

Console.Out.Newline = String.Empty;

Then I am able to control the output myself;

Console.WriteLine("Starting item 1:");
    Item1();
Console.WriteLine("OK.\nStarting Item2:");

Another way of getting there.

DLL load failed error when importing cv2

I had the same issue when installing opencv 2.4.13 on Anaconda3 (Python 3.6)... I managed to fix this issue by reverting to Anaconda2 (Python 2.7)

Automatically set appsettings.json for dev and release environments in asp.net core?

You can make use of environment variables and the ConfigurationBuilder class in your Startup constructor like this:

public Startup(IHostingEnvironment env)
{
    var builder = new ConfigurationBuilder()
    .SetBasePath(env.ContentRootPath)
    .AddJsonFile("appsettings.json", optional: true, reloadOnChange: true)
    .AddJsonFile($"appsettings.{env.EnvironmentName}.json", optional: true)
    .AddEnvironmentVariables();
    this.configuration = builder.Build();
}

Then you create an appsettings.xxx.json file for every environment you need, with "xxx" being the environment name. Note that you can put all global configuration values in your "normal" appsettings.json file and only put the environment specific stuff into these new files.

Now you only need an environment variable called ASPNETCORE_ENVIRONMENT with some specific environment value ("live", "staging", "production", whatever). You can specify this variable in your project settings for your development environment, and of course you need to set it in your staging and production environments also. The way you do it there depends on what kind of environment this is.

UPDATE: I just realized you want to choose the appsettings.xxx.json based on your current build configuration. This cannot be achieved with my proposed solution and I don't know if there is a way to do this. The "environment variable" way, however, works and might as well be a good alternative to your approach.

How does Spring autowire by name when more than one matching bean is found?

One more solution with resolving by name:

@Resource(name="country")

It uses javax.annotation package, so it's not Spring specific, but Spring supports it.

How do I get the Session Object in Spring?

In my scenario, I've injected the HttpSession into the CustomAuthenticationProvider class like this

public class CustomAuthenticationProvider extends  AbstractUserDetailsAuthenticationProvider{

    @Autowired 
    private HttpSession httpSession;

    @Override
    protected void additionalAuthenticationChecks(UserDetails userDetails, UsernamePasswordAuthenticationToken usernamePasswordAuthenticationToken)
             throws AuthenticationException
    {
        System.out.println("Method invoked : additionalAuthenticationChecks isAuthenticated ? :"+usernamePasswordAuthenticationToken.isAuthenticated());
    }

    @Override
    protected UserDetails retrieveUser(String username,UsernamePasswordAuthenticationToken authentication) throws AuthenticationException 
    {
        System.out.println("Method invoked : retrieveUser");
        //so far so good, i can authenticate user here, and throw exception 
if not authenticated!!
        //THIS IS WHERE I WANT TO ACCESS SESSION OBJECT
        httpSession.setAttribute("userObject", myUserObject);
    }
}

How to search for a string in an arraylist

Since your list doesn't appear to be sorted, you have to iterate over its elements. Apply startsWith() or contains() to each element, and store matches in an auxiliary list. Return the auxiliary list when done.

Making view resize to its parent when added with addSubview

Just copy the parent view's frame to the child-view then add it. After that autoresizing will work. Actually you should only copy the size CGRectMake(0, 0, parentView.frame.size.width, parentView.frame.size.height)

childView.frame = CGRectMake(0, 0, parentView.frame.size.width, parentView.frame.size.height);
[parentView addSubview:childView];

Get LatLng from Zip Code - Google Maps API

This is just an improvement to the previous answers because it didn't work for me with some zipcodes even when in https://www.google.com/maps it does, I fixed just adding the word "zipcode " before to put the zipcode, like this:

_x000D_

function getLatLngByZipcode(zipcode) _x000D_
{_x000D_
    var geocoder = new google.maps.Geocoder();_x000D_
    var address = zipcode;_x000D_
    geocoder.geocode({ 'address': 'zipcode '+address }, function (results, status) {_x000D_
        if (status == google.maps.GeocoderStatus.OK) {_x000D_
            var latitude = results[0].geometry.location.lat();_x000D_
            var longitude = results[0].geometry.location.lng();_x000D_
            alert("Latitude: " + latitude + "\nLongitude: " + longitude);_x000D_
        } else {_x000D_
            alert("Request failed.")_x000D_
        }_x000D_
    });_x000D_
    return [latitude, longitude];_x000D_
}

_x000D_

How to import large sql file in phpmyadmin

Edit the config.inc.php file located in the phpmyadmin directory. In my case it is located at C:\wamp\apps\phpmyadmin3.2.0.1\config.inc.php.

Find the line with $cfg['UploadDir'] on it and update it to $cfg['UploadDir'] = 'upload';

Then, create a directory called ‘upload’ within the phpmyadmin directory (for me, at C:\wamp\apps\phpmyadmin3.2.0.1\upload\).

Then place the large SQL file that you are trying to import into the new upload directory. Now when you go onto the db import page within phpmyadmin console you will notice a drop down present that wasn’t there before – it contains all of the sql files in the upload directory that you have just created. You can now select this and begin the import.

If you’re not using WAMP on Windows, then I’m sure you’ll be able to adapt this to your environment without too much trouble.

Reference : http://daipratt.co.uk/importing-large-files-into-mysql-with-phpmyadmin/comment-page-4/

Boxplot show the value of mean

The Magrittr way

I know there is an accepted answer already, but I wanted to show one cool way to do it in single command with the help of magrittr package.

PlantGrowth %$% # open dataset and make colnames accessible with '$'
split(weight,group) %T>% # split by group and side-pipe it into boxplot
boxplot %>% # plot
lapply(mean) %>% # data from split can still be used thanks to side-pipe '%T>%'
unlist %T>% # convert to atomic and side-pipe it to points
points(pch=18)  %>% # add points for means to the boxplot
text(x=.+0.06,labels=.) # use the values to print text

This code will produce a boxplot with means printed as points and values:

I split the command on multiple lines so I can comment on what each part does, but it can also be entered as a oneliner. You can learn more about this in my gist.

Command line input in Python

Start your script with the following line. The script will first run and then you will get the python command prompt. At this point all variables and functions will be available for interactive use and invocations.

#!/usr/bin/env python -i

Merge up to a specific commit

Sure, being in master branch all you need to do is:

git merge <commit-id>

where commit-id is hash of the last commit from newbranch that you want to get in your master branch.

You can find out more about any git command by doing git help <command>. It that case it's git help merge. And docs are saying that the last argument for merge command is <commit>..., so you can pass reference to any commit or even multiple commits. Though, I never did the latter myself.

MySQL Error #1133 - Can't find any matching row in the user table

I encountered this issue, but in my case the password for the 'phpmyadmin' user did not match the contents of /etc/phpmyadmin/config-db.php

Once I updated the password for the 'phpmyadmin' user the error went away.

These are the steps I took:

Log in to mysql as root: mysql -uroot -pYOUR_ROOT_PASS
Change to the 'mysql' db: use mysql;
Update the password for the 'phpmyadmin' user: UPDATE mysql.user SET Password=PASSWORD('YOUR_PASS_HERE') WHERE User='phpmyadmin' AND Host='localhost';
Flush privileges: FLUSH PRIVILEGES;

DONE!! It worked for me.

How to use "raise" keyword in Python

Besides raise Exception("message") and raise Python 3 introduced a new form, raise Exception("message") from e. It's called exception chaining, it allows you to preserve the original exception (the root cause) with its traceback.

It's very similar to inner exceptions from C#.

More info: https://www.python.org/dev/peps/pep-3134/

Disable F5 and browser refresh using JavaScript

From the site Enrique posted:

window.history.forward(1);
document.attachEvent("onkeydown", my_onkeydown_handler);
function my_onkeydown_handler() {
    switch (event.keyCode) {
        case 116 : // 'F5'
            event.returnValue = false;
            event.keyCode = 0;
            window.status = "We have disabled F5";
            break;
    }
}

compilation error: identifier expected

You have not defined a method around your code.

import java.io.*;

public class details
{
    public static void main( String[] args )
    {
        BufferedReader in = new BufferedReader(new InputStreamReader(System.in));
        System.out.println("What is your name?");
        String name = in.readLine(); ;
        System.out.println("Hello " + name);
    }
}

In this case, I have assumed that you want your code to be executed in the main method of the class. It is, of course, possible that this code goes in any other method.

Convert int to ASCII and back in Python

If multiple characters are bound inside a single integer/long, as was my issue:

s = '0123456789'
nchars = len(s)
# string to int or long. Type depends on nchars
x = sum(ord(s[byte])<<8*(nchars-byte-1) for byte in range(nchars))
# int or long to string
''.join(chr((x>>8*(nchars-byte-1))&0xFF) for byte in range(nchars))

Yields '0123456789' and x = 227581098929683594426425L

Sort a two dimensional array based on one column

install java8 jdk+jre
use lamda expression to sort 2D array.

code:

import java.util.Arrays;
import java.util.Comparator;

class SortString {

    public static void main(final String[] args) {
        final String[][] data = new String[][] {
                new String[] { "2009.07.25 20:24", "Message A" },
                new String[] { "2009.07.25 20:17", "Message G" },
                new String[] { "2009.07.25 20:25", "Message B" },
                new String[] { "2009.07.25 20:30", "Message D" },
                new String[] { "2009.07.25 20:01", "Message F" },
                new String[] { "2009.07.25 21:08", "Message E" },
                new String[] { "2009.07.25 19:54", "Message R" } 
        };
        // this is applicable only in java 8 version.
        Arrays.sort(data, (String[] s1, String[] s2) -> s1[0].compareTo(s2[0]));

        // we can also use Comparator.comparing and point to Comparable value we want to use        
        // Arrays.sort(data, Comparator.comparing(row->row[0]));

        for (final String[] s : data) {
            System.out.println(s[0] + " " + s[1]);
        }
    }
}

output

2009.07.25 19:54 Message R
2009.07.25 20:01 Message F
2009.07.25 20:17 Message G
2009.07.25 20:24 Message A
2009.07.25 20:25 Message B
2009.07.25 20:30 Message D
2009.07.25 21:08 Message E

When do I need to use AtomicBoolean in Java?

Excerpt from the package description

Package java.util.concurrent.atomic description: A small toolkit of classes that support lock-free thread-safe programming on single variables.[...]

The specifications of these methods enable implementations to employ efficient machine-level atomic instructions that are available on contemporary processors.[...]

Instances of classes AtomicBoolean, AtomicInteger, AtomicLong, and AtomicReference each provide access and updates to a single variable of the corresponding type.[...]

The memory effects for accesses and updates of atomics generally follow the rules for volatiles:

get has the memory effects of reading a volatile variable.

set has the memory effects of writing (assigning) a volatile variable.

weakCompareAndSet atomically reads and conditionally writes a variable, is ordered with respect to other memory operations on that variable, but otherwise acts as an ordinary non-volatile memory operation.

compareAndSet and all other read-and-update operations such as getAndIncrement have the memory effects of both reading and writing volatile variables.

Execute a command line binary with Node.js

Since version 4 the closest alternative is child_process.execSync method:

const {execSync} = require('child_process');

let output = execSync('prince -v builds/pdf/book.html -o builds/pdf/book.pdf');

?? Note that execSync call blocks event loop.

Get top n records for each group of grouped results

I wanted to share this because I spent a long time searching for an easy way to implement this in a java program I'm working on. This doesn't quite give the output you're looking for but its close. The function in mysql called GROUP_CONCAT() worked really well for specifying how many results to return in each group. Using LIMIT or any of the other fancy ways of trying to do this with COUNT didn't work for me. So if you're willing to accept a modified output, its a great solution. Lets say I have a table called 'student' with student ids, their gender, and gpa. Lets say I want to top 5 gpas for each gender. Then I can write the query like this

SELECT sex, SUBSTRING_INDEX(GROUP_CONCAT(cast(gpa AS char ) ORDER BY gpa desc), ',',5) 
AS subcategories FROM student GROUP BY sex;

Note that the parameter '5' tells it how many entries to concatenate into each row

And the output would look something like

+--------+----------------+
| Male   | 4,4,4,4,3.9    |
| Female | 4,4,3.9,3.9,3.8|
+--------+----------------+

You can also change the ORDER BY variable and order them a different way. So if I had the student's age I could replace the 'gpa desc' with 'age desc' and it will work! You can also add variables to the group by statement to get more columns in the output. So this is just a way I found that is pretty flexible and works good if you are ok with just listing results.

How do I clear/reset the selected dates on the jQuery UI Datepicker calendar?

MySql sum elements of a column

select
  sum(a) as atotal,
  sum(b) as btotal,
  sum(c) as ctotal
from
  yourtable t
where
  t.id in (1, 2, 3)

CodeIgniter 404 Page Not Found, but why?

If your application is in sub-folder then the Folder name in directory and URL must be same (case-sensitive).

PHP Try and Catch for SQL Insert

Use any method described in the previous post to somehow catch the mysql error.
Most common is:

$res = mysql_query('bla');
if ($res===false) {
  //error
  die();
}
//normal page

This would also work:

function error() {
  //error
  die()
}
$res = mysql_query('bla') or error();
//normal page

try { ... } catch {Exception $e) { .... } will not work!

Note: Not directly related to you question but I think it would much more better if you display something usefull to the user. I would never revisit a website that just displays a blank screen or any mysterious error message.

How to update/modify an XML file in python?

To make this process more robust, you could consider using the SAX parser (that way you don't have to hold the whole file in memory), read & write till the end of tree and then start appending.

makefiles - compile all c files at once

SRCS=$(wildcard *.c)

OBJS=$(SRCS:.c=.o)

all: $(OBJS)

Smooth scroll to specific div on click

There are many examples of smooth scrolling using JS libraries like jQuery, Mootools, Prototype, etc.

The following example is on pure JavaScript. If you have no jQuery/Mootools/Prototype on page or you don't want to overload page with heavy JS libraries the example will be of help.

http://jsfiddle.net/rjSfP/

HTML Part:

<div class="first"><button type="button" onclick="smoothScroll(document.getElementById('second'))">Click Me!</button></div>
<div class="second" id="second">Hi</div>

CSS Part:

.first {
    width: 100%;
    height: 1000px;
    background: #ccc;
}

.second {
    width: 100%;
    height: 1000px;
    background: #999;
}

JS Part:

window.smoothScroll = function(target) {
    var scrollContainer = target;
    do { //find scroll container
        scrollContainer = scrollContainer.parentNode;
        if (!scrollContainer) return;
        scrollContainer.scrollTop += 1;
    } while (scrollContainer.scrollTop == 0);

    var targetY = 0;
    do { //find the top of target relatively to the container
        if (target == scrollContainer) break;
        targetY += target.offsetTop;
    } while (target = target.offsetParent);

    scroll = function(c, a, b, i) {
        i++; if (i > 30) return;
        c.scrollTop = a + (b - a) / 30 * i;
        setTimeout(function(){ scroll(c, a, b, i); }, 20);
    }
    // start scrolling
    scroll(scrollContainer, scrollContainer.scrollTop, targetY, 0);
}

What's the fastest way to read a text file line-by-line?

To find the fastest way to read a file line by line you will have to do some benchmarking. I have done some small tests on my computer but you cannot expect that my results apply to your environment.

Using StreamReader.ReadLine

This is basically your method. For some reason you set the buffer size to the smallest possible value (128). Increasing this will in general increase performance. The default size is 1,024 and other good choices are 512 (the sector size in Windows) or 4,096 (the cluster size in NTFS). You will have to run a benchmark to determine an optimal buffer size. A bigger buffer is - if not faster - at least not slower than a smaller buffer.

const Int32 BufferSize = 128;
using (var fileStream = File.OpenRead(fileName))
  using (var streamReader = new StreamReader(fileStream, Encoding.UTF8, true, BufferSize)) {
    String line;
    while ((line = streamReader.ReadLine()) != null)
      // Process line
  }

The FileStream constructor allows you to specify FileOptions. For example, if you are reading a large file sequentially from beginning to end, you may benefit from FileOptions.SequentialScan. Again, benchmarking is the best thing you can do.

Using File.ReadLines

This is very much like your own solution except that it is implemented using a StreamReader with a fixed buffer size of 1,024. On my computer this results in slightly better performance compared to your code with the buffer size of 128. However, you can get the same performance increase by using a larger buffer size. This method is implemented using an iterator block and does not consume memory for all lines.

var lines = File.ReadLines(fileName);
foreach (var line in lines)
  // Process line

Using File.ReadAllLines

This is very much like the previous method except that this method grows a list of strings used to create the returned array of lines so the memory requirements are higher. However, it returns String[] and not an IEnumerable<String> allowing you to randomly access the lines.

var lines = File.ReadAllLines(fileName);
for (var i = 0; i < lines.Length; i += 1) {
  var line = lines[i];
  // Process line
}

Using String.Split

This method is considerably slower, at least on big files (tested on a 511 KB file), probably due to how String.Split is implemented. It also allocates an array for all the lines increasing the memory required compared to your solution.

using (var streamReader = File.OpenText(fileName)) {
  var lines = streamReader.ReadToEnd().Split("\r\n".ToCharArray(), StringSplitOptions.RemoveEmptyEntries);
  foreach (var line in lines)
    // Process line
}

My suggestion is to use File.ReadLines because it is clean and efficient. If you require special sharing options (for example you use FileShare.ReadWrite), you can use your own code but you should increase the buffer size.

BeautifulSoup Grab Visible Webpage Text

from bs4 import BeautifulSoup
from bs4.element import Comment
import urllib.request
import re
import ssl

def tag_visible(element):
    if element.parent.name in ['style', 'script', 'head', 'title', 'meta', '[document]']:
        return False
    if isinstance(element, Comment):
        return False
    if re.match(r"[\n]+",str(element)): return False
    return True
def text_from_html(url):
    body = urllib.request.urlopen(url,context=ssl._create_unverified_context()).read()
    soup = BeautifulSoup(body ,"lxml")
    texts = soup.findAll(text=True)
    visible_texts = filter(tag_visible, texts)  
    text = u",".join(t.strip() for t in visible_texts)
    text = text.lstrip().rstrip()
    text = text.split(',')
    clean_text = ''
    for sen in text:
        if sen:
            sen = sen.rstrip().lstrip()
            clean_text += sen+','
    return clean_text
url = 'http://www.nytimes.com/2009/12/21/us/21storm.html'
print(text_from_html(url))

Converting 24 hour time to 12 hour time w/ AM & PM using Javascript

Here is a nice little function that worked for me.

function getDisplayDatetime() {
    var d = new Date(); var hh = d.getHours(); var mm = d.getMinutes(); var dd = "AM"; var h = hh;

    if (mm.toString().length == 1) {
        mm = "0" + mm;
    }

    if (h >= 12) {
        h = hh - 12;
        dd = "PM";
    }

    if (h == 0) {
        h = 12;
    }
    var Datetime = "Datetime: " + d.getFullYear() + "/" + (d.getMonth() + 1) + "/" + d.getUTCDate() + " " + h + ":" + mm;
    return Datetime + " " + dd;
}

Transport endpoint is not connected

Now this answer is for those lost souls that got here with this problem because they force-unmounted the drive but their hard drive is NTFS Formatted. Assuming you have ntfs-3g installed (sudo apt-get install ntfs-3g).

sudo ntfs-3g /dev/hdd /mnt/mount_point -o force

Where hdd is the hard drive in question and the "/mnt/mount_point" directory exists.

NOTES: This fixed the issue on an Ubuntu 18.04 machine using NTFS drives that had their journal files reset through sudo ntfsfix /dev/hdd and unmounted by force using sudo umount -l /mnt/mount_point

Leaving my answer here in case this fix can aid anyone!

How to split a dos path into its components in Python

Adapted the solution of @Mike Robins avoiding empty path elements at the beginning:

def parts(path):
    p,f = os.path.split(os.path.normpath(path))
    return parts(p) + [f] if f and p else [p] if p else []

os.path.normpath() is actually required only once and could be done in a separate entry function to the recursion.

How to change MySQL data directory?

Under SuSE 13.1, this works fine to move the mysql data directory elsewhere, e.g. to /home/example_user/ , and to give it a more informative name:

In /var/lib/ :

# mv -T mysql /home/example_user/mysql_datadir
# ln -s /home/example_user/mysql_datadir ./mysql

I restarted mysql:

# systemctl restart mysql.service

but suspect that even that wasn't necessary.

Disable the postback on an <ASP:LinkButton>

call java script function on onclick event.

Get restaurants near my location

Is this what you are looking for?

https://maps.googleapis.com/maps/api/place/search/xml?location=49.260691,-123.137784&radius=500&sensor=false&key=*PlacesAPIKey*&types=restaurant

types is optional

Removing empty lines in Notepad++

CTRL+A, Select the TextFX menu -> TextFX Edit -> Delete Blank Lines as suggested above works.

But if lines contains some space, then move the cursor to that line and do a CTRL + H. The "Find what:" sec will show the blank space and in the "Replace with" section, leave it blank. Now all the spaces are removed and now try CTRL+A, Select the TextFX menu -> TextFX Edit -> Delete Blank Lines

ssh : Permission denied (publickey,gssapi-with-mic)

fixed by setting GSSAPIAuthentication to no in /etc/ssh/sshd_config

What is "android:allowBackup"?

Here is what backup in this sense really means:

Android's backup service allows you to copy your persistent application data to remote "cloud" storage, in order to provide a restore point for the application data and settings. If a user performs a factory reset or converts to a new Android-powered device, the system automatically restores your backup data when the application is re-installed. This way, your users don't need to reproduce their previous data or application settings.

~Taken from http://developer.android.com/guide/topics/data/backup.html

You can register for this backup service as a developer here: https://developer.android.com/google/backup/signup.html

The type of data that can be backed up are files, databases, sharedPreferences, cache, and lib. These are generally stored in your device's /data/data/[com.myapp] directory, which is read-protected and cannot be accessed unless you have root privileges.

UPDATE: You can see this flag listed on BackupManager's api doc: BackupManager

How to get a substring between two strings in PHP?

If the strings are different (ie: [foo] & [/foo]), take a look at this post from Justin Cook. I copy his code below:

function get_string_between($string, $start, $end){
    $string = ' ' . $string;
    $ini = strpos($string, $start);
    if ($ini == 0) return '';
    $ini += strlen($start);
    $len = strpos($string, $end, $ini) - $ini;
    return substr($string, $ini, $len);
}

$fullstring = 'this is my [tag]dog[/tag]';
$parsed = get_string_between($fullstring, '[tag]', '[/tag]');

echo $parsed; // (result = dog)

How to save user input into a variable in html and js

<html>    
    <input type="text" placeholder ="username" id="userinput">
    <br>
    <input type="password" placeholder="password">
    <br>
    <button type="submit" onclick="myfunc()" id="demo">click me</button>

    <script type="text/javascript">
        function myfunc() {
            var input = document.getElementById('userinput');
            alert(input.value);
        } 
    </script>
</html>

Search all of Git history for a string?

Try the following commands to search the string inside all previous tracked files:

git log --patch  | less +/searching_string

git rev-list --all | GIT_PAGER=cat xargs git grep 'search_string'

which needs to be run from the parent directory where you'd like to do the searching.

how to put image in a bundle and pass it to another activity

So you can do it like this, but the limitation with the Parcelables is that the payload between activities has to be less than 1MB total. It's usually better to save the Bitmap to a file and pass the URI to the image to the next activity.

 protected void onCreate(Bundle savedInstanceState) {     setContentView(R.layout.my_layout);     Bitmap bitmap = getIntent().getParcelableExtra("image");     ImageView imageView = (ImageView) findViewById(R.id.imageview);     imageView.setImageBitmap(bitmap);  }

HTML not loading CSS file

Your css file should be defined as UTF-8. Put this in the first line of you css file.

@charset "UTF-8";

C++ -- expected primary-expression before ' '

You should not be repeating the string part when sending parameters.

int wordLength = wordLengthFunction(word); //you do not put string word here.

Calculate difference between 2 date / times in Oracle SQL

select round( (tbl.Todate - tbl.fromDate) * 24 * 60 * 60 ) from table tbl

Base64 Encoding Image

Google led me to this solution (base64_encode). Hope this helps!

get DATEDIFF excluding weekends using sql server

/* EXAMPLE: /MONDAY/ SET DATEFIRST 1 SELECT dbo.FUNC_GETDATEDIFFERENCE_WO_WEEKEND('2019-02-01','2019-02-12') */ CREATE FUNCTION FUNC_GETDATEDIFFERENCE_WO_WEEKEND ( @pdtmaLastLoanPayDate DATETIME, @pdtmaDisbursedDate DATETIME ) RETURNS BIGINT BEGIN

DECLARE
@mintDaysDifference     BIGINT

SET @mintDaysDifference = 0

WHILE CONVERT(NCHAR(10),@pdtmaLastLoanPayDate,121) <= CONVERT(NCHAR(10),@pdtmaDisbursedDate,121)
BEGIN
    IF DATEPART(WEEKDAY,@pdtmaLastLoanPayDate) NOT IN (6,7)
    BEGIN
        SET @mintDaysDifference = @mintDaysDifference + 1
    END

    SET @pdtmaLastLoanPayDate = DATEADD(DAY,1,@pdtmaLastLoanPayDate)
END

RETURN ISNULL(@mintDaysDifference,0)

END

How to get week number in Python?

There are many systems for week numbering. The following are the most common systems simply put with code examples:

ISO: First week starts with Monday and must contain the January 4th. The ISO calendar is already implemented in Python:
```
>>> from datetime import date
>>> date(2014, 12, 29).isocalendar()[:2]
(2015, 1)
```

North American: First week starts with Sunday and must contain the January 1st. The following code is my modified version of Python's ISO calendar implementation for the North American system:

from datetime import date

def week_from_date(date_object):
    date_ordinal = date_object.toordinal()
    year = date_object.year
    week = ((date_ordinal - _week1_start_ordinal(year)) // 7) + 1
    if week >= 52:
        if date_ordinal >= _week1_start_ordinal(year + 1):
            year += 1
            week = 1
    return year, week

def _week1_start_ordinal(year):
    jan1 = date(year, 1, 1)
    jan1_ordinal = jan1.toordinal()
    jan1_weekday = jan1.weekday()
    week1_start_ordinal = jan1_ordinal - ((jan1_weekday + 1) % 7)
    return week1_start_ordinal

>>> from datetime import date
>>> week_from_date(date(2014, 12, 29))
(2015, 1)

MMWR (CDC): First week starts with Sunday and must contain the January 4th. I created the epiweeks package specifically for this numbering system (also has support for the ISO system). Here is an example:
```
>>> from datetime import date
>>> from epiweeks import Week
>>> Week.fromdate(date(2014, 12, 29))
(2014, 53)
```

How to cache data in a MVC application

I use two classes. First one the cache core object:

public class Cacher<TValue>
    where TValue : class
{
    #region Properties
    private Func<TValue> _init;
    public string Key { get; private set; }
    public TValue Value
    {
        get
        {
            var item = HttpRuntime.Cache.Get(Key) as TValue;
            if (item == null)
            {
                item = _init();
                HttpContext.Current.Cache.Insert(Key, item);
            }
            return item;
        }
    }
    #endregion

    #region Constructor
    public Cacher(string key, Func<TValue> init)
    {
        Key = key;
        _init = init;
    }
    #endregion

    #region Methods
    public void Refresh()
    {
        HttpRuntime.Cache.Remove(Key);
    }
    #endregion
}

Second one is list of cache objects:

public static class Caches
{
    static Caches()
    {
        Languages = new Cacher<IEnumerable<Language>>("Languages", () =>
                                                          {
                                                              using (var context = new WordsContext())
                                                              {
                                                                  return context.Languages.ToList();
                                                              }
                                                          });
    }
    public static Cacher<IEnumerable<Language>> Languages { get; private set; }
}

nginx - nginx: [emerg] bind() to [::]:80 failed (98: Address already in use)

I had several *.save files (emergency dumps from nano) from different NGINX config files in my sites-avilable dir. Once I deleted these .save files, NGINX restarted fine. I assumed these were harmless since there were no corresponding symlinks, but I guess I was wrong.

The openssl extension is required for SSL/TLS protection

The same error occurred to me. I fixed it by turning off TLS for Composer, it's not safe but I assumed the risk on my develop machine.

try this:

composer config -g -- disable-tls true

and re-run your Composer. It works to me!

But it's unsecure and not recommended for your Server. The official website says:

If set to true all HTTPS URLs will be tried with HTTP instead and no network-level encryption is performed. Enabling this is a security risk and is NOT recommended. The better way is to enable the php_openssl extension in php.ini.

If you don't want to enable unsecure layer in your machine/server, then setup your php to enable openssl and it also works. Make sure the PHP Openssl extension has been installed and enable it on php.ini file.

To enable OpenSSL, add or find and uncomment this line on your php.ini file:

Linux/OSx:

extension=php_openssl.so

Windows:

extension=php_openssl.dll

And reload your php-fpm / web-server if needed!

Convert a Unicode string to an escaped ASCII string

Here is my current implementation:

public static class UnicodeStringExtensions
{
    public static string EncodeNonAsciiCharacters(this string value) {
        var bytes = Encoding.Unicode.GetBytes(value);
        var sb = StringBuilderCache.Acquire(value.Length);
        bool encodedsomething = false;
        for (int i = 0; i < bytes.Length; i += 2) {
            var c = BitConverter.ToUInt16(bytes, i);
            if ((c >= 0x20 && c <= 0x7f) || c == 0x0A || c == 0x0D) {
                sb.Append((char) c);
            } else {
                sb.Append($"\\u{c:x4}");
                encodedsomething = true;
            }
        }
        if (!encodedsomething) {
            StringBuilderCache.Release(sb);
            return value;
        }
        return StringBuilderCache.GetStringAndRelease(sb);
    }


    public static string DecodeEncodedNonAsciiCharacters(this string value)
      => Regex.Replace(value,/*language=regexp*/@"(?:\\u[a-fA-F0-9]{4})+", Decode);

    static readonly string[] Splitsequence = new [] { "\\u" };
    private static string Decode(Match m) {
        var bytes = m.Value.Split(Splitsequence, StringSplitOptions.RemoveEmptyEntries)
                .Select(s => ushort.Parse(s, NumberStyles.HexNumber)).SelectMany(BitConverter.GetBytes).ToArray();
        return Encoding.Unicode.GetString(bytes);
    }
}

This passes a test:

public void TestBigUnicode() {
    var s = "\U00020000";
    var encoded = s.EncodeNonAsciiCharacters();
    var decoded = encoded.DecodeEncodedNonAsciiCharacters();
    Assert.Equals(s, decoded);
}

with the encoded value: "\ud840\udc00"

This implementation makes use of a StringBuilderCache (reference source link)

ASP.NET MVC JsonResult Date Format

I found this to be the easiest way to change it server side.

using System.Collections.Generic;
using System.Web.Mvc;
using Newtonsoft.Json;
using Newtonsoft.Json.Converters;
using Newtonsoft.Json.Serialization;

namespace Website
{
    /// <summary>
    /// This is like MVC5's JsonResult but it uses CamelCase and date formatting.
    /// </summary>
    public class MyJsonResult : ContentResult
    {
        private static readonly JsonSerializerSettings Settings = new JsonSerializerSettings
        {
            ContractResolver = new CamelCasePropertyNamesContractResolver(),
            Converters = new List<JsonConverter> { new StringEnumConverter() }
        };

        public FindersJsonResult(object obj)
        {
            this.Content = JsonConvert.SerializeObject(obj, Settings);
            this.ContentType = "application/json";
        }
    }
}

How do I reformat HTML code using Sublime Text 2?

I created a Package called HTMLBeautify that does a decent job of reformatting HTML. I based it off of a Perl script I found back in 1997—I updated it to work with all the new fangled modern tags. :)

Check it out and let me know what you think!

https://github.com/rareyman/HTMLBeautify

adding x and y axis labels in ggplot2

[Note: edited to modernize ggplot syntax]

Your example is not reproducible since there is no ex1221new (there is an ex1221 in Sleuth2, so I guess that is what you meant). Also, you don't need (and shouldn't) pull columns out to send to ggplot. One advantage is that ggplot works with data.frames directly.

You can set the labels with xlab() and ylab(), or make it part of the scale_*.* call.

library("Sleuth2")
library("ggplot2")
ggplot(ex1221, aes(Discharge, Area)) +
  geom_point(aes(size=NO3)) + 
  scale_size_area() + 
  xlab("My x label") +
  ylab("My y label") +
  ggtitle("Weighted Scatterplot of Watershed Area vs. Discharge and Nitrogen Levels (PPM)")

enter image description here

ggplot(ex1221, aes(Discharge, Area)) +
  geom_point(aes(size=NO3)) + 
  scale_size_area("Nitrogen") + 
  scale_x_continuous("My x label") +
  scale_y_continuous("My y label") +
  ggtitle("Weighted Scatterplot of Watershed Area vs. Discharge and Nitrogen Levels (PPM)")

enter image description here

An alternate way to specify just labels (handy if you are not changing any other aspects of the scales) is using the labs function

ggplot(ex1221, aes(Discharge, Area)) +
  geom_point(aes(size=NO3)) + 
  scale_size_area() + 
  labs(size= "Nitrogen",
       x = "My x label",
       y = "My y label",
       title = "Weighted Scatterplot of Watershed Area vs. Discharge and Nitrogen Levels (PPM)")

which gives an identical figure to the one above.

Android java.lang.NoClassDefFoundError

Try going to Project -> Properties -> Java Build Path -> Order & Export And Confirm Android Private Libraries are checked for your project and for all other library projects you are using in your Application.

DataRow: Select cell value by a given column name

for (int i=0;i < Table.Rows.Count;i++)
{
      Var YourValue = Table.Rows[i]["ColumnName"];
}

Passing just a type as a parameter in C#

There are two common approaches. First, you can pass System.Type

object GetColumnValue(string columnName, Type type)
{
    // Here, you can check specific types, as needed:

    if (type == typeof(int)) { // ...

This would be called like: int val = (int)GetColumnValue(columnName, typeof(int));

The other option would be to use generics:

T GetColumnValue<T>(string columnName)
{
    // If you need the type, you can use typeof(T)...

This has the advantage of avoiding the boxing and providing some type safety, and would be called like: int val = GetColumnValue<int>(columnName);

How to install Ruby 2.1.4 on Ubuntu 14.04

Use RVM (Ruby Version Manager) to install and manage any versions of Ruby. You can have multiple versions of Ruby installed on the machine and you can easily select the one you want.

To install RVM type into terminal:

\curl -sSL https://get.rvm.io | bash -s stable

And let it work. After that you will have RVM along with Ruby installed.

Source: RVM Site

CSS Background Image Not Displaying

background : url (/img.. )

NOTE: If you have your css in a different folder, ensure that you start the image path with THE FORWARD SLASH.

It worked for me. !

jQuery Ajax Request inside Ajax Request

Here is an example:

$.ajax({
        type: "post",
        url: "ajax/example.php",
        data: 'page=' + btn_page,
        success: function (data) {
            var a = data; // This line shows error.
            $.ajax({
                type: "post",
                url: "example.php",
                data: 'page=' + a,
                success: function (data) {

                }
            });
        }
    });

How can I force browsers to print background images in CSS?

The below code works well for me (at least for Chrome).

I also added some margin and page orientation controls.(portrait, landscape)

<style type="text/css" media="print">
@media print {
  body {-webkit-print-color-adjust: exact;}
}
@page {
    size:A4 landscape;
    margin-left: 0px;
    margin-right: 0px;
    margin-top: 0px;
    margin-bottom: 0px;
    margin: 0;
    -webkit-print-color-adjust: exact;
}
</style>

How to remove items from a list while iterating?

In some situations, where you're doing more than simply filtering a list one item at time, you want your iteration to change while iterating.

Here is an example where copying the list beforehand is incorrect, reverse iteration is impossible and a list comprehension is also not an option.

""" Sieve of Eratosthenes """

def generate_primes(n):
    """ Generates all primes less than n. """
    primes = list(range(2,n))
    idx = 0
    while idx < len(primes):
        p = primes[idx]
        for multiple in range(p+p, n, p):
            try:
                primes.remove(multiple)
            except ValueError:
                pass #EAFP
        idx += 1
        yield p

Uncaught SyntaxError: Unexpected token :

I had the same problem and it turned out that the Json returned from the server wasn't valid Json-P. If you don't use the call as a crossdomain call use regular Json.

System.out.println() shortcut on Intellij IDEA

In Idea 17eap:

sout: Prints

System.out.println();

soutm: Prints current class and method names to System.out

System.out.println("$CLASS_NAME$.$METHOD_NAME$");

soutp: Prints method parameter names and values to System.out

System.out.println($FORMAT$);

soutv: Prints a value to System.out

System.out.println("$EXPR_COPY$ = " + $EXPR$);

How to import an Excel file into SQL Server?

There are many articles about writing code to import an excel file, but this is a manual/shortcut version:

If you don't need to import your Excel file programmatically using code you can do it very quickly using the menu in SQL Management Studio.

The quickest way to get your Excel file into SQL is by using the import wizard:

Open SSMS (Sql Server Management Studio) and connect to the database where you want to import your file into.
Import Data: in SSMS in Object Explorer under 'Databases' right-click the destination database, select Tasks, Import Data. An import wizard will pop up (you can usually just click 'Next' on the first screen).

The next window is 'Choose a Data Source', select Excel:
- In the 'Data Source' dropdown list select Microsoft Excel (this option should appear automatically if you have excel installed).
- Click the 'Browse' button to select the path to the Excel file you want to import.
- Select the version of the excel file (97-2003 is usually fine for files with a .XLS extension, or use 2007 for newer files with a .XLSX extension)
- Tick the 'First Row has headers' checkbox if your excel file contains headers.
- Click next.

On the 'Choose a Destination' screen, select destination database:
- Select the 'Server name', Authentication (typically your sql username & password) and select a Database as destination. Click Next.

On the 'Specify Table Copy or Query' window:
- For simplicity just select 'Copy data from one or more tables or views', click Next.
'Select Source Tables:' choose the worksheet(s) from your Excel file and specify a destination table for each worksheet. If you don't have a table yet the wizard will very kindly create a new table that matches all the columns from your spreadsheet. Click Next.

Click Finish.

How to beautifully update a JPA entity in Spring Data?

If you need to work with DTOs rather than entities directly then you should retrieve the existing Customer instance and map the updated fields from the DTO to that.

Customer entity = //load from DB
//map fields from DTO to entity

Convert int to string?

None of the answers mentioned that the ToString() method can be applied to integer expressions

Debug.Assert((1000*1000).ToString()=="1000000");

even to integer literals

Debug.Assert(256.ToString("X")=="100");

Although integer literals like this are often considered to be bad coding style (magic numbers) there may be cases where this feature is useful...

How do I check if a Socket is currently connected in Java?

Assuming you have some level of control over the protocol, I'm a big fan of sending heartbeats to verify that a connection is active. It's proven to be the most fail proof method and will often give you the quickest notification when a connection has been broken.

TCP keepalives will work, but what if the remote host is suddenly powered off? TCP can take a long time to timeout. On the other hand, if you have logic in your app that expects a heartbeat reply every x seconds, the first time you don't get them you know the connection no longer works, either by a network or a server issue on the remote side.

See Do I need to heartbeat to keep a TCP connection open? for more discussion.

An ASP.NET setting has been detected that does not apply in Integrated managed pipeline mode

Check if there is any conflict in your IIS authentication. i.e. you enable the anonymous authentication and ASP.NET impersonation both might cause the error also.

Can't connect to MySQL server on '127.0.0.1' (10061) (2003)

I know that there are a lot of answers to this question already already but i wanted to share my experience as none of the answers provided fixed this issue for me.

After about a day of exploring different solutions I believe the issue was that I have recently installed XAMPP and it was interfering with the MySQL workbench. I have tried changing the port numbers however this hasn't helped, and it seems that both programs are sharing configuration files. Repairing MySQL in the Control Panel didn't resolve it, so now I am uninstalling MySQL and plan to reinstall it. Another potential solution maybe to uninstall XAMPP however the config files may either be deleted, or left in the xampp folder instead of the MySQL folder by doing so.

How to calculate UILabel height dynamically?

If you are using a UILabel with attributes, you can try the method textRect(forBounds:limitedToNumberOfLines).

This is my example:

let label = UILabel(frame: CGRect(x: 0, y: 0, width: 100, height: 30))
label.numberOfLines = 0
label.text = "Learn how to use RxSwift and RxCocoa to write applications that can react to changes in your underlying data without you telling it to do so."

let rectOfLabel = label.textRect(forBounds: CGRect(x: 0, y: 0, width: 100, height: CGFloat.greatestFiniteMagnitude), limitedToNumberOfLines: 0)
let rectOfLabelOneLine = label.textRect(forBounds: CGRect(x: 0, y: 0, width: 100, height: CGFloat.greatestFiniteMagnitude), limitedToNumberOfLines: 1)
let heightOfLabel = rectOfLabel.height
let heightOfLine = rectOfLabelOneLine.height
let numberOfLines = Int(heightOfLabel / heightOfLine)

And my results on the Playground:

Convert array to JSON string in swift

You can try this.

func convertToJSONString(value: AnyObject) -> String? {
        if JSONSerialization.isValidJSONObject(value) {
            do{
                let data = try JSONSerialization.data(withJSONObject: value, options: [])
                if let string = NSString(data: data, encoding: String.Encoding.utf8.rawValue) {
                    return string as String
                }
            }catch{
            }
        }
        return nil
    }

Python Math - TypeError: 'NoneType' object is not subscriptable

lista = list.sort(lista)

This should be

lista.sort()

The .sort() method is in-place, and returns None. If you want something not in-place, which returns a value, you could use

sorted_list = sorted(lista)

Aside #1: please don't call your lists list. That clobbers the builtin list type.

Aside #2: I'm not sure what this line is meant to do:

print str("value 1a")+str(" + ")+str("value 2")+str(" = ")+str("value 3a ")+str("value 4")+str("\n")

is it simply

print "value 1a + value 2 = value 3a value 4"

? In other words, I don't know why you're calling str on things which are already str.

Aside #3: sometimes you use print("something") (Python 3 syntax) and sometimes you use print "something" (Python 2). The latter would give you a SyntaxError in py3, so you must be running 2.*, in which case you probably don't want to get in the habit or you'll wind up printing tuples, with extra parentheses. I admit that it'll work well enough here, because if there's only one element in the parentheses it's not interpreted as a tuple, but it looks strange to the pythonic eye..

The exception TypeError: 'NoneType' object is not subscriptable happens because the value of lista is actually None. You can reproduce TypeError that you get in your code if you try this at the Python command line:

None[0]

The reason that lista gets set to None is because the return value of list.sort() is None... it does not return a sorted copy of the original list. Instead, as the documentation points out, the list gets sorted in-place instead of a copy being made (this is for efficiency reasons).

If you do not want to alter the original version you can use

other_list = sorted(lista)

Difference between except: and except Exception as e: in Python

There are differences with some exceptions, e.g. KeyboardInterrupt.

Reading PEP8:

A bare except: clause will catch SystemExit and KeyboardInterrupt exceptions, making it harder to interrupt a program with Control-C, and can disguise other problems. If you want to catch all exceptions that signal program errors, use except Exception: (bare except is equivalent to except BaseException:).

PHP MySQL Google Chart JSON - Complete Example

Some might encounter this error either locally or on the server:

syntax error var data = new google.visualization.DataTable(<?=$jsonTable?>);

This means that their environment does not support short tags the solution is to use this instead:

<?php echo $jsonTable; ?>

And everything should work fine!

How to convert a GUID to a string in C#?

Following Sonar rules, you should whenever you can try to protect yourself, and use System.globalisation whenever it's possible like for DateTime.ToString().

So regarding the other answers you could use:

guid.ToString("", CultureInfo.InvariantCulture)

where "" can be replaces by : N, D, B , P and X for more infos see this comment.

Example here

How to abort an interactive rebase if --abort doesn't work?

Try to follow the advice you see on the screen, and first reset your master's HEAD to the commit it expects.

git update-ref refs/heads/master b918ac16a33881ce00799bea63d9c23bf7022d67

Then, abort the rebase again.

Best way to compare two complex objects

Thanks to the example of Jonathan. I expanded it for all cases (arrays, lists, dictionaries, primitive types).

This is a comparison without serialization and does not require the implementation of any interfaces for compared objects.

        /// <summary>Returns description of difference or empty value if equal</summary>
        public static string Compare(object obj1, object obj2, string path = "")
        {
            string path1 = string.IsNullOrEmpty(path) ? "" : path + ": ";
            if (obj1 == null && obj2 != null)
                return path1 + "null != not null";
            else if (obj2 == null && obj1 != null)
                return path1 + "not null != null";
            else if (obj1 == null && obj2 == null)
                return null;

            if (!obj1.GetType().Equals(obj2.GetType()))
                return "different types: " + obj1.GetType() + " and " + obj2.GetType();

            Type type = obj1.GetType();
            if (path == "")
                path = type.Name;

            if (type.IsPrimitive || typeof(string).Equals(type))
            {
                if (!obj1.Equals(obj2))
                    return path1 + "'" + obj1 + "' != '" + obj2 + "'";
                return null;
            }
            if (type.IsArray)
            {
                Array first = obj1 as Array;
                Array second = obj2 as Array;
                if (first.Length != second.Length)
                    return path1 + "array size differs (" + first.Length + " vs " + second.Length + ")";

                var en = first.GetEnumerator();
                int i = 0;
                while (en.MoveNext())
                {
                    string res = Compare(en.Current, second.GetValue(i), path);
                    if (res != null)
                        return res + " (Index " + i + ")";
                    i++;
                }
            }
            else if (typeof(System.Collections.IEnumerable).IsAssignableFrom(type))
            {
                System.Collections.IEnumerable first = obj1 as System.Collections.IEnumerable;
                System.Collections.IEnumerable second = obj2 as System.Collections.IEnumerable;

                var en = first.GetEnumerator();
                var en2 = second.GetEnumerator();
                int i = 0;
                while (en.MoveNext())
                {
                    if (!en2.MoveNext())
                        return path + ": enumerable size differs";

                    string res = Compare(en.Current, en2.Current, path);
                    if (res != null)
                        return res + " (Index " + i + ")";
                    i++;
                }
            }
            else
            {
                foreach (PropertyInfo pi in type.GetProperties(BindingFlags.NonPublic | BindingFlags.Instance | BindingFlags.Public))
                {
                    try
                    {
                        var val = pi.GetValue(obj1);
                        var tval = pi.GetValue(obj2);
                        if (path.EndsWith("." + pi.Name))
                            return null;
                        var pathNew = (path.Length == 0 ? "" : path + ".") + pi.Name;
                        string res = Compare(val, tval, pathNew);
                        if (res != null)
                            return res;
                    }
                    catch (TargetParameterCountException)
                    {
                        //index property
                    }
                }
                foreach (FieldInfo fi in type.GetFields(BindingFlags.NonPublic | BindingFlags.Instance | BindingFlags.Public))
                {
                    var val = fi.GetValue(obj1);
                    var tval = fi.GetValue(obj2);
                    if (path.EndsWith("." + fi.Name))
                        return null;
                    var pathNew = (path.Length == 0 ? "" : path + ".") + fi.Name;
                    string res = Compare(val, tval, pathNew);
                    if (res != null)
                        return res;
                }
            }
            return null;
        }

For easy copying of the code created repository

Getting a list of associative array keys

for (var key in dictionary) {
  // Do something with key
}

It's the for..in statement.

How do I remove an item from a stl vector with a certain value?

From c++20:

A non-member function introduced std::erase, which takes the vector and value to be removed as inputs.

ex:

std::vector<int> v = {90,80,70,60,50};
std::erase(v,50);

Nexus 7 (2013) and Win 7 64 - cannot install USB driver despite checking many forums and online resources

Don´t use USB3.0 ports ... try it on a usb 2.0 port

Also try to change transfer mode, like suggested here: https://android.stackexchange.com/a/49662

Android: Internet connectivity change listener

first add dependency in your code as implementation 'com.treebo:internetavailabilitychecker:1.0.4'
implements your class with InternetConnectivityListener.

public class MainActivity extends AppCompatActivity implements InternetConnectivityListener {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        InternetAvailabilityChecker.init(this);
        mInternetAvailabilityChecker = InternetAvailabilityChecker.getInstance();
        mInternetAvailabilityChecker.addInternetConnectivityListener(this);
    }

    @Override
    public void onInternetConnectivityChanged(boolean isConnected) {
        if (isConnected) {
            alertDialog = new AlertDialog.Builder(this).create();
            alertDialog.setTitle(" internet is connected or not");
            alertDialog.setMessage("connected");
            alertDialog.setButton(AlertDialog.BUTTON_NEUTRAL, "OK",
                    new DialogInterface.OnClickListener() {
                        public void onClick(DialogInterface dialog, int which) {
                            dialog.dismiss();
                        }
                    });
            alertDialog.show();

    }
    else {
            alertDialog = new AlertDialog.Builder(this).create();
            alertDialog.setTitle("internet is connected or not");
            alertDialog.setMessage("not connected");
            alertDialog.setButton(AlertDialog.BUTTON_NEUTRAL, "OK",
                    new DialogInterface.OnClickListener() {
                        public void onClick(DialogInterface dialog, int which) {
                            dialog.dismiss();
                        }
                    });
            alertDialog.show();

        }
    }
}

How can I insert a line break into a <Text> component in React Native?

You can try using like this

<text>{`${val}\n`}</text>

Add zero-padding to a string

int num = 1;
num.ToString("0000");

Regular expression for decimal number

There is an alternative approach, which does not have I18n problems (allowing ',' or '.' but not both): Decimal.TryParse.

Just try converting, ignoring the value.

bool IsDecimalFormat(string input) {
  Decimal dummy;
  return Decimal.TryParse(input, out dummy);
}

This is significantly faster than using a regular expression, see below.

(The overload of Decimal.TryParse can be used for finer control.)

Performance test results: Decimal.TryParse: 0.10277ms, Regex: 0.49143ms

Code (PerformanceHelper.Run is a helper than runs the delegate for passed iteration count and returns the average TimeSpan.):

using System;
using System.Text.RegularExpressions;
using DotNetUtils.Diagnostics;

class Program {
    static private readonly string[] TestData = new string[] {
        "10.0",
        "10,0",
        "0.1",
        ".1",
        "Snafu",
        new string('x', 10000),
        new string('2', 10000),
        new string('0', 10000)
    };

    static void Main(string[] args) {
        Action parser = () => {
            int n = TestData.Length;
            int count = 0;
            for (int i = 0; i < n; ++i) {
                decimal dummy;
                count += Decimal.TryParse(TestData[i], out dummy) ? 1 : 0;
            }
        };
        Regex decimalRegex = new Regex(@"^[0-9]([\.\,][0-9]{1,3})?$");
        Action regex = () => {
            int n = TestData.Length;
            int count = 0;
            for (int i = 0; i < n; ++i) {
                count += decimalRegex.IsMatch(TestData[i]) ? 1 : 0;
            }
        };

        var paserTotal = 0.0;
        var regexTotal = 0.0;
        var runCount = 10;
        for (int run = 1; run <= runCount; ++run) {
            var parserTime = PerformanceHelper.Run(10000, parser);
            var regexTime = PerformanceHelper.Run(10000, regex);

            Console.WriteLine("Run #{2}: Decimal.TryParse: {0}ms, Regex: {1}ms",
                              parserTime.TotalMilliseconds, 
                              regexTime.TotalMilliseconds,
                              run);
            paserTotal += parserTime.TotalMilliseconds;
            regexTotal += regexTime.TotalMilliseconds;
        }

        Console.WriteLine("Overall averages: Decimal.TryParse: {0}ms, Regex: {1}ms",
                          paserTotal/runCount,
                          regexTotal/runCount);
    }
}

Rails: Get Client IP address

request.remote_ip is an interpretation of all the available IP address information and it will make a best-guess. If you access the variables directly you assume responsibility for testing them in the correct precedence order. Proxies introduce a number of headers that create environment variables with different names.

How to remove index.php from URLs?

Hi I'm late to the party.. just wanted to point out that the instructions from http://davidtsadler.com/archives/2012/06/03/how-to-install-magento-on-ubuntu/ were really useful.

I had Ubuntu server installed with Apache, MySql and Php so I thought I could jump to the heading Creating the directory from which Magento will be served from and I reached the same problem as the OP, i.e. I had 'index.php' needed in all the URLs (or I would get 404 not found). I then went back to Installing and configuring the Apache HTTP server and after restarting apache it works perfectly.

For reference, I was missing:

sudo bash -c "cat >> /etc/apache2/conf.d/servername.conf <<EOF
ServerName localhost
EOF"

... and

sudo a2enmod rewrite
sudo service apache2 restart

Hope this helps

Allow 2 decimal places in <input type="number">

I found using jQuery was my best solution.

$( "#my_number_field" ).blur(function() {
    this.value = parseFloat(this.value).toFixed(2);
});

Updating the value of data attribute using jQuery

$('.toggle img').data('block', 'something');
$('.toggle img').attr('src', 'something.jpg');

Use jQuery.data and jQuery.attr.

I'm showing them to you separately for the sake of understanding.

Public class is inaccessible due to its protection level

You could go into the designer of the web form and change the "webcontrols" to be "public" instead of "protected" but I'm not sure how safe that is. I prefer to make hidden inputs and have some jQuery set the values into those hidden inputs, then create public properties in the web form's class (code behind), and access the values that way.

Open youtube video in Fancybox jquery

Thanx, Alexander!

And to set the fancy-close button above the youtube's flash-content add 'wmode' to 'swf' parameters:

'swf': {'allowfullscreen':'true', 'wmode':'transparent'}

c++ parse int from string

There is no "right way". If you want a universal (but suboptimal) solution you can use a boost::lexical cast.

A common solution for C++ is to use std::ostream and << operator. You can use a stringstream and stringstream::str() method for conversion to string.

If you really require a fast mechanism (remember the 20/80 rule) you can look for a "dedicated" solution like C++ String Toolkit Library

Best Regards,
Marcin

Add new element to an existing object

jQuery syntax mentioned above by Danilo Valente is not working. It should be as following-

$.extend(myFunction,{
    bookName:'mybook',
    bookdesc: 'new'
});

How can I convert integer into float in Java?

Here is how you can do it :

public static void main(String[] args) {
    // TODO Auto-generated method stub
    int x = 3;
    int y = 2;
    Float fX = new Float(x);
    float res = fX.floatValue()/y;
    System.out.println("res = "+res);
}

See you !

What is 0x10 in decimal?

0xNNNN (not necessarily four digits) represents, in C at least, a hexadecimal (base-16 because 'hex' is 6 and 'dec' is 10 in Latin-derived languages) number, where N is one of the digits 0 through 9 or A through F (or their lower case equivalents, either representing 10 through 15), and there may be 1 or more of those digits in the number. The other way of representing it is NNNN₁₆.

It's very useful in the computer world as a single hex digit represents four bits (binary digits). That's because four bits, each with two possible values, gives you a total of 2 x 2 x 2 x 2 or 16 (2⁴) values. In other words:

  _____________________________________bits____________________________________
 /                                                                             \
+----+----+----+----+----+----+----+----+----+----+----+----+----+----+----+----+
| bF | bE | bD | bC | bB | bA | b9 | b8 | b7 | b6 | b5 | b4 | b3 | b2 | b1 | b0 |
+----+----+----+----+----+----+----+----+----+----+----+----+----+----+----+----+
 \_________________/ \_________________/ \_________________/ \_________________/ 
      Hex digit           Hex digit           Hex digit           Hex digit

A base-X number is a number where each position represents a multiple of a power of X.

In base 10, which we humans are used to, the digits used are 0 through 9, and the number 7304₁₀ is:

(7 x 10³) = 7000₁₀ ; plus
(3 x 10²) = 300₁₀ ; plus
(0 x 10¹) = 0₁₀ ; plus
(4 x 10⁰) = 4₁₀ ; equals 7304.

In octal, where the digits are 0 through 7. the number 754₈ is:

(7 x 8²) = 448₁₀ ; plus
(5 x 8¹) = 40₁₀ ; plus
(4 x 8⁰) = 4₁₀ ; equals 492₁₀.

Octal numbers in C are preceded by the character 0 so 0123 is not 123 but is instead (1 * 64) + (2 * 8) + 3, or 83.

In binary, where the digits are 0 and 1. the number 1011₂ is:

(1 x 2³) = 8₁₀ ; plus
(0 x 2²) = 0₁₀ ; plus
(1 x 2¹) = 2₁₀ ; plus
(1 x 2⁰) = 1₁₀ ; equals 11₁₀.

In hexadecimal, where the digits are 0 through 9 and A through F (which represent the "digits" 10 through 15). the number 7F24₁₆ is:

(7 x 16³) = 28672₁₀ ; plus
(F x 16²) = 3840₁₀ ; plus
(2 x 16¹) = 32₁₀ ; plus
(4 x 16⁰) = 4₁₀ ; equals 32548₁₀.

Your relatively simple number 0x10, which is the way C represents 10₁₆, is simply:

(1 x 16¹) = 16₁₀ ; plus
(0 x 16⁰) = 0₁₀ ; equals 16₁₀.

As an aside, the different bases of numbers are used for many things.

base 10 is used, as previously mentioned, by we humans with 10 digits on our hands.
base 2 is used by computers due to the relative ease of representing the two binary states with electrical circuits.
base 8 is used almost exclusively in UNIX file permissions so that each octal digit represents a 3-tuple of binary permissions (read/write/execute). It's also used in C-based languages and UNIX utilities to inject binary characters into an otherwise printable-character-only data stream.
base 16 is a convenient way to represent four bits to a digit, especially as most architectures nowadays have a word size which is a multiple of four bits.
base 64 is used in encoding mail so that binary files may be sent using only printable characters. Each digit represents six binary digits so you can pack three eight-bit characters into four six-bit digits (25% increased file size but guaranteed to get through the mail gateways untouched).
as a semi-useful snippet, base 60 comes from some very old civilisation (Babylon, Sumeria, Mesopotamia or something like that) and is the source of 60 seconds/minutes in the minute/hour, 360 degrees in a circle, 60 minutes (of arc) in a degree and so on [not really related to the computer industry, but interesting nonetheless].
as an even less-useful snippet, the ultimate question and answer in The Hitchhikers Guide To The Galaxy was "What do you get when you multiply 6 by 9?" and "42". Whilst same say this is because the Earth computer was faulty, others see it as proof that the creator has 13 fingers :-)

Scala: write string to file in one statement

If you like Groovy syntax, you can use the Pimp-My-Library design pattern to bring it to Scala:

import java.io._
import scala.io._

class RichFile( file: File ) {

  def text = Source.fromFile( file )(Codec.UTF8).mkString

  def text_=( s: String ) {
    val out = new PrintWriter( file , "UTF-8")
    try{ out.print( s ) }
    finally{ out.close }
  }
}

object RichFile {

  implicit def enrichFile( file: File ) = new RichFile( file )

}

It will work as expected:

scala> import RichFile.enrichFile
import RichFile.enrichFile

scala> val f = new File("/tmp/example.txt")
f: java.io.File = /tmp/example.txt

scala> f.text = "hello world"

scala> f.text
res1: String = 
"hello world

How to draw rounded rectangle in Android UI?

Right_click on the drawable and create new layout xml file in the name of for example button_background.xml. then copy and paste the following code. You can change it according your need.

<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android"
android:shape="rectangle">
<corners
android:radius="14dp" />
<solid android:color="@color/colorButton" />
<padding
android:bottom="0dp"
android:left="0dp"
android:right="0dp"
android:top="0dp" />
<size
android:width="120dp"
android:height="40dp" />
</shape>

Now you can use it.

<Button
android:background="@drawable/button_background"
android:layout_width="wrap_content"
android:layout_height="wrap_content"/>

Javascript: open new page in same window

try

_x000D_

<a href="#" _x000D_
   onclick="location='http://example.com/submit.php?url='+escape(location)"_x000D_
   >click here</a>

_x000D_

PHP refresh window? equivalent to F5 page reload?

Actually it is possible:

Header('Location: '.$_SERVER['PHP_SELF']);
Exit(); //optional

And it will reload the same page.

How to change the link color in a specific class for a div CSS

#register a:link
{
color:#fffff;
}

Measure execution time for a Java method

Check this: System.currentTimeMillis.

With this you can calculate the time of your method by doing:

long start = System.currentTimeMillis();
class.method();
long time = System.currentTimeMillis() - start;

Ansible playbook shell output

This is a start may be :

- hosts: all
  gather_facts: no
  tasks:
    - shell: ps -eo pcpu,user,args | sort -r -k1 | head -n5
      register: ps

    - local_action: command echo item
      with_items: ps.stdout_lines

NOTE: Docs regarding ps.stdout_lines are covered here: ('Register Variables' chapter).

How do I get the current date in JavaScript?

(function() { var d = new Date(); return new Date(d - d % 86400000); })()

Change the Blank Cells to "NA"

My function takes into account factor, character vector and potential attributes, if you use haven or foreign package to read external files. Also it allows matching different self-defined na.strings. To transform all columns, simply use lappy: df[] = lapply(df, blank2na, na.strings=c('','NA','na','N/A','n/a','NaN','nan'))

See more the comments:

#' Replaces blank-ish elements of a factor or character vector to NA
#' @description Replaces blank-ish elements of a factor or character vector to NA
#' @param x a vector of factor or character or any type
#' @param na.strings case sensitive strings that will be coverted to NA. The function will do a trimws(x,'both') before conversion. If NULL, do only trimws, no conversion to NA.
#' @return Returns a vector trimws (always for factor, character) and NA converted (if matching na.strings). Attributes will also be kept ('label','labels', 'value.labels').
#' @seealso \code{\link{ez.nan2na}}
#' @export
blank2na = function(x,na.strings=c('','.','NA','na','N/A','n/a','NaN','nan')) {
    if (is.factor(x)) {
        lab = attr(x, 'label', exact = T)
        labs1 <- attr(x, 'labels', exact = T)
        labs2 <- attr(x, 'value.labels', exact = T)

        # trimws will convert factor to character
        x = trimws(x,'both')
        if (! is.null(lab)) lab = trimws(lab,'both')
        if (! is.null(labs1)) labs1 = trimws(labs1,'both')
        if (! is.null(labs2)) labs2 = trimws(labs2,'both')

        if (!is.null(na.strings)) {
            # convert to NA
            x[x %in% na.strings] = NA
            # also remember to remove na.strings from value labels 
            labs1 = labs1[! labs1 %in% na.strings]
            labs2 = labs2[! labs2 %in% na.strings]
        }

        # the levels will be reset here
        x = factor(x)

        if (! is.null(lab)) attr(x, 'label') <- lab
        if (! is.null(labs1)) attr(x, 'labels') <- labs1
        if (! is.null(labs2)) attr(x, 'value.labels') <- labs2
    } else if (is.character(x)) {
        lab = attr(x, 'label', exact = T)
        labs1 <- attr(x, 'labels', exact = T)
        labs2 <- attr(x, 'value.labels', exact = T)

        # trimws will convert factor to character
        x = trimws(x,'both')
        if (! is.null(lab)) lab = trimws(lab,'both')
        if (! is.null(labs1)) labs1 = trimws(labs1,'both')
        if (! is.null(labs2)) labs2 = trimws(labs2,'both')

        if (!is.null(na.strings)) {
            # convert to NA
            x[x %in% na.strings] = NA
            # also remember to remove na.strings from value labels 
            labs1 = labs1[! labs1 %in% na.strings]
            labs2 = labs2[! labs2 %in% na.strings]
        }

        if (! is.null(lab)) attr(x, 'label') <- lab
        if (! is.null(labs1)) attr(x, 'labels') <- labs1
        if (! is.null(labs2)) attr(x, 'value.labels') <- labs2
    } else {
        x = x
    }
    return(x)
}

Escaping special characters in Java Regular Expressions

I wrote this pattern:

Pattern SPECIAL_REGEX_CHARS = Pattern.compile("[{}()\\[\\].+*?^$\\\\|]");

And use it in this method:

String escapeSpecialRegexChars(String str) {

    return SPECIAL_REGEX_CHARS.matcher(str).replaceAll("\\\\$0");
}

Then you can use it like this, for example:

Pattern toSafePattern(String text)
{
    return Pattern.compile(".*" + escapeSpecialRegexChars(text) + ".*");
}

We needed to do that because, after escaping, we add some regex expressions. If not, you can simply use \Q and \E:

Pattern toSafePattern(String text)
{
    return Pattern.compile(".*\\Q" + text + "\\E.*")
}

TypeError: can't use a string pattern on a bytes-like object in re.findall()

The problem is that your regex is a string, but html is bytes:

>>> type(html)
<class 'bytes'>

Since python doesn't know how those bytes are encoded, it throws an exception when you try to use a string regex on them.

You can either decode the bytes to a string:

html = html.decode('ISO-8859-1')  # encoding may vary!
title = re.findall(pattern, html)  # no more error

Or use a bytes regex:

regex = rb'<title>(,+?)</title>'
#        ^

In this particular context, you can get the encoding from the response headers:

with urllib.request.urlopen(url) as response:
    encoding = response.info().get_param('charset', 'utf8')
    html = response.read().decode(encoding)

See the urlopen documentation for more details.

MySQL default datetime through phpmyadmin

I don't think you can achieve that with mysql date. You have to use timestamp or try this approach..

CREATE TRIGGER table_OnInsert BEFORE INSERT ON `DB`.`table`
FOR EACH ROW SET NEW.dateColumn = IFNULL(NEW.dateColumn, NOW());

RestSharp simple complete example

Pawel Sawicz .NET blog has a real good explanation and example code, explaining how to call the library;

GET:

var client = new RestClient("192.168.0.1");
var request = new RestRequest("api/item/", Method.GET);
var queryResult = client.Execute<List<Items>>(request).Data;

POST:

var client = new RestClient("http://192.168.0.1");
var request = new RestRequest("api/item/", Method.POST);
request.RequestFormat = DataFormat.Json;
request.AddBody(new Item
{
   ItemName = someName,
   Price = 19.99
});
client.Execute(request);

DELETE:

var item = new Item(){//body};
var client = new RestClient("http://192.168.0.1");
var request = new RestRequest("api/item/{id}", Method.DELETE);
request.AddParameter("id", idItem);
 
client.Execute(request)

The RestSharp GitHub page has quite an exhaustive sample halfway down the page. To get started install the RestSharp NuGet package in your project, then include the necessary namespace references in your code, then above code should work (possibly negating your need for a full example application).

NuGet RestSharp

Get list of data-* attributes using javascript / jQuery

you could access the data using $('#prod')[0].dataset

Background color in input and text fields

The best solution is the attribute selector in CSS (input[type="text"]) as the others suggested.

But if you have to support Internet Explorer 6, you cannot use it (QuirksMode). Well, only if you have to and also are willing to support it.

In this case your only option seems to be to define classes on input elements.

<input type="text" class="input-box" ... />
<input type="submit" class="button" ... />
...

and target them with a class selector:

input.input-box, textarea { background: cyan; }

How to install the Sun Java JDK on Ubuntu 10.10 (Maverick Meerkat)?

Ubuntu reporsitories can be more useful

https://wiki.ubuntu.com/LucidLynx/ReleaseNotes#Sun%20Java%20moved%20to%20the%20Partner%20repository

MySQL fails on: mysql "ERROR 1524 (HY000): Plugin 'auth_socket' is not loaded"

I got a solution!

When resetting root password at step 2), also change the auth plugin to mysql_native_password:

use mysql;
update user set authentication_string=PASSWORD("") where User='root';
update user set plugin="mysql_native_password" where User='root';  # THIS LINE

flush privileges;
quit;

This allowed me to log in successfully!

Full code solution

1. run bash commands

1. first, run these bash commands

sudo /etc/init.d/mysql stop # stop mysql service
sudo mysqld_safe --skip-grant-tables & # start mysql without password
# enter -> go
mysql -uroot # connect to mysql

2. then run mysql commands => copy paste this to cli manually

use mysql; # use mysql table
update user set authentication_string=PASSWORD("") where User='root'; # update password to nothing
update user set plugin="mysql_native_password" where User='root'; # set password resolving to default mechanism for root user

flush privileges;
quit;

3. run more bash commands

sudo /etc/init.d/mysql stop 
sudo /etc/init.d/mysql start # reset mysql
# try login to database, just press enter at password prompt because your password is now blank
mysql -u root -p

4. Socket issue (from your comments)

When you see a socket error, a community came with 2 possible solutions:

sudo mkdir -p /var/run/mysqld; sudo chown mysql /var/run/mysqld
sudo mysqld_safe --skip-grant-tables &

(thanks to @Cerin)

mkdir -p /var/run/mysqld && chown mysql:mysql /var/run/mysqld

(thanks to @Peter Dvukhrechensky)

Blind paths and possible edge errors

Use 127.0.0.1 instead of localhost

mysql -uroot # "-hlocalhost" is default

Can lead to "missing file" or slt error.

mysql -uroot -h127.0.0.1

Works better.

Skip the socket issue

I've found many ways to create mysqld.sock file, change access rights or symlink it. It was not the issue after all.

Skip the `my.cnf` file

The issue also was not there. If you are not sure, this might help you.

How can I store the result of a system command in a Perl variable?

Also for eg. you can use IPC::Run:

use IPC::Run qw(run);

my $pid = 5892;
run [qw(top -H -n 1 -p), $pid],
    '|', sub { print grep { /myprocess/ } <STDIN> },
    '|', [qw(wc -l)],
    '>', \my $out;

print $out;

processes are running without bash subprocess
can be piped to perl subs
very similar to shell

How to redirect the output of a PowerShell to a file during its execution

To embed this in your script, you can do it like this:

        Write-Output $server.name | Out-File '(Your Path)\Servers.txt' -Append

That should do the trick.

Difference between core and processor

In the early days...like before the 90s...the processors weren't able to do multi tasks that efficiently...coz a single processor could handle just a single task...so when we used to say that my antivirus,microsoft word,vlc,etc. softwares are all running at the same time...that isn't actually true. When I said a processor could handle a single process at a time...I meant it. It actually would process a single task...then it used to pause that task...take another task...complete it if its a short one or again pause it and add it to the queue...then the next. But this 'pause' that I mentioned was so small (appx. 1ns) that you didn't understand that the task has been paused. Eg. On vlc while listening to music there are other apps running simultaneously but as I told you...one program at a time...so the vlc is actually pausing in between for ns so you dont underatand it but the music is actually stopping in between.

But this was about the old processors...

Now-a- days processors ie 3rd gen pcs have multi cored processors. Now the 'cores' can be compared to a 1st or 2nd gen processors itself...embedded onto a single chip, a single processor. So now we understood what are cores ie they are mini processors which combine to become a processor. And each core can handle a single process at a time or multi threads as designed for the OS. And they folloq the same steps as I mentioned above about the single processor.

Eg. A i7 6gen processor has 8 cores...ie 8 mini processors in 1 i7...ie its speed is 8x times the old processors. And this is how multi tasking can be done.

There could be hundreds of cores in a single processor Eg. Intel i128.

I hope I explaned this well.

Excel - Using COUNTIF/COUNTIFS across multiple sheets/same column

My first post... UDF I managed quickly to compile. Usage: Select 3D range as normal and enclose is into quotation marks like below...

=CountIf3D("'StartSheet:EndSheet'!G16:G878";"Criteria")

Advisably sheets to be adjacent to avoid unanticipated results.

Public Function CountIf3D(SheetstoCount As String, CriteriaToUse As Variant)

     Dim sStarSheet As String, sEndSheet As String, sAddress As String
     Dim lColonPos As Long, lExclaPos As Long, cnt As Long

    lColonPos = InStr(SheetstoCount, ":") 'Finding ':' separating sheets
    lExclaPos = InStr(SheetstoCount, "!") 'Finding '!' separating address from the sheets

    sStarSheet = Mid(SheetstoCount, 2, lColonPos - 2) 'Getting first sheet's name
    sEndSheet = Mid(SheetstoCount, lColonPos + 1, lExclaPos - lColonPos - 2) 'Getting last sheet's name

    sAddress = Mid(SheetstoCount, lExclaPos + 1, Len(SheetstoCount) - lExclaPos) 'Getting address

        cnt = 0
   For i = Sheets(sStarSheet).Index To Sheets(sEndSheet).Index
        cnt = cnt + Application.CountIf(Sheets(i).Range(sAddress), CriteriaToUse)
   Next

   CountIf3D = cnt

End Function

Show constraints on tables command

afaik to make a request to information_schema you need privileges. If you need simple list of keys you can use this command:

SHOW INDEXES IN <tablename>

Get selected value in dropdown list using JavaScript

The simplest way to do this is:

var value = document.getElementById("selectId").value;

Installing Bootstrap 3 on Rails App

For me, the simplest way to do this is

1) Download and unzip bootstrap into vendor

2) Add the bootstrap path to your config

config.assets.paths << Rails.root.join("vendor/bootstrap-3.3.6-dist")

3) Require them

in css *= require css/bootstrap

in js //= require js/bootstrap

Done!

This methods makes the fonts load without any other special configuration and doesn't require moving the bootstrap files out of their self-contained directory.

Download large file in python with requests

use wget module of python instead. Here is a snippet

import wget
wget.download(url)

jQuery get value of selected radio button

multi group radio button covert value to array

_x000D_

var arr = [];_x000D_
    function r(n) {_x000D_
_x000D_
_x000D_
        var section = $('input:radio[name="' + n + '"]:checked').val();_x000D_
        arr[n] = section;_x000D_
_x000D_
        console.log(arr)_x000D_
    }

_x000D_

<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>_x000D_
<input type="radio" onchange="r('b1')" class="radioID" name="b1" value="1">1_x000D_
<input type="radio" onchange="r('b1')"  class="radioID" name="b1" value="2"  >2_x000D_
<input type="radio" onchange="r('b1')"   class="radioID" name="b1" value="3">3_x000D_
_x000D_
<br>_x000D_
_x000D_
<input type="radio" onchange="r('b2')" class="radioID2" name="b2" value="4">4_x000D_
<input type="radio" onchange="r('b2')"  class="radioID2" name="b2" value="5"  >5_x000D_
<input type="radio" onchange="r('b2')"   class="radioID2" name="b2" value="6">6

_x000D_

How to play only the audio of a Youtube video using HTML 5?

The answer is simple: Use a 3rd party product like jwplayer or similar, then set it to the minimal player size which is the audio player size (only shows player controls).

Voila.

Been using this for over 8 years.

ASP.NET MVC Razor: How to render a Razor Partial View's HTML inside the controller action

You could also use the RenderView Controller extension from here (source)

and use it like this:

public ActionResult Do() {
var html = this.RenderView("index", theModel);
...
}

it works for razor and web-forms viewengines

How to remove all leading zeroes in a string

Similar to another suggestion, except will not obliterate actual zero:

if (ltrim($str, '0') != '') {
    $str = ltrim($str, '0');
} else {
    $str = '0';
}

Or as was suggested (as of PHP 5.3), shorthand ternary operator can be used:

$str = ltrim($str, '0') ?: '0';

How do I use ROW_NUMBER()?

If you need to return the table's total row count, you can use an alternative way to the SELECT COUNT(*) statement.

Because SELECT COUNT(*) makes a full table scan to return the row count, it can take very long time for a large table. You can use the sysindexes system table instead in this case. There is a ROWS column that contains the total row count for each table in your database. You can use the following select statement:

SELECT rows FROM sysindexes WHERE id = OBJECT_ID('table_name') AND indid < 2

This will drastically reduce the time your query takes.

jquery's append not working with svg element?

I can see circle in firefox, doing 2 things:

1) Renaming file from html to xhtml

2) Change script to

<script type="text/javascript">
$(document).ready(function(){
    var obj = document.createElementNS("http://www.w3.org/2000/svg", "circle");
    obj.setAttributeNS(null, "cx", 100);
    obj.setAttributeNS(null, "cy", 50);
    obj.setAttributeNS(null, "r",  40);
    obj.setAttributeNS(null, "stroke", "black");
    obj.setAttributeNS(null, "stroke-width", 2);
    obj.setAttributeNS(null, "fill", "red");
    $("svg")[0].appendChild(obj);
});
</script>

Capture key press without placing an input element on the page?

Code & detects ctrl+z

document.onkeyup = function(e) {
  if(e.ctrlKey && e.keyCode == 90) {
    // ctrl+z pressed
  }
}

Specifying Font and Size in HTML table

The font tag has been deprecated for some time now.

That being said, the reason why both of your tables display with the same font size is that the 'size' attribute only accepts values ranging from 1 - 7. The smallest size is 1. The largest size is 7. The default size is 3. Any values larger than 7 will just display the same as if you had used 7, because 7 is the maximum value allowed.

And as @Alex H said, you should be using CSS for this.

Increment a value in Postgres

UPDATE totals 
   SET total = total + 1
WHERE name = 'bill';

If you want to make sure the current value is indeed 203 (and not accidently increase it again) you can also add another condition:

UPDATE totals 
   SET total = total + 1
WHERE name = 'bill'
  AND total = 203;

Android findViewById() in Custom View

@Override
public View getView(int position, View convertView, ViewGroup parent) {
    View row = convertView;
    ImageHolder holder = null;
    if (row == null) {
        LayoutInflater inflater = ((Activity) context).getLayoutInflater();
        row = inflater.inflate(layoutResourceId, parent, false);
        holder = new ImageHolder();
        editText = (EditText) row.findViewById(R.id.id_number_custom);
        loadButton = (ImageButton) row.findViewById(R.id.load_data_button);
        row.setTag(holder);
    } else {
        holder = (ImageHolder) row.getTag();
    }


    holder.editText.setText("Your Value");
    holder.loadButton.setImageBitmap("Your Bitmap Value");
    return row;
}

What is the difference between T(n) and O(n)?

Short explanation:

If an algorithm is of T(g(n)), it means that the running time of the algorithm as n (input size) gets larger is proportional to g(n).

If an algorithm is of O(g(n)), it means that the running time of the algorithm as n gets larger is at most proportional to g(n).

Normally, even when people talk about O(g(n)) they actually mean T(g(n)) but technically, there is a difference.

More technically:

O(n) represents upper bound. T(n) means tight bound. O(n) represents lower bound.

f(x) = T(g(x)) iff f(x) = O(g(x)) and f(x) = O(g(x))

Basically when we say an algorithm is of O(n), it's also O(n²), O(n^1000000), O(2ⁿ), ... but a T(n) algorithm is not T(n²).

In fact, since f(n) = T(g(n)) means for sufficiently large values of n, f(n) can be bound within c₁g(n) and c₂g(n) for some values of c₁ and c₂, i.e. the growth rate of f is asymptotically equal to g: g can be a lower bound and and an upper bound of f. This directly implies f can be a lower bound and an upper bound of g as well. Consequently,

f(x) = T(g(x)) iff g(x) = T(f(x))

Similarly, to show f(n) = T(g(n)), it's enough to show g is an upper bound of f (i.e. f(n) = O(g(n))) and f is a lower bound of g (i.e. f(n) = O(g(n)) which is the exact same thing as g(n) = O(f(n))). Concisely,

f(x) = T(g(x)) iff f(x) = O(g(x)) and g(x) = O(f(x))

There are also little-oh and little-omega (?) notations representing loose upper and loose lower bounds of a function.

To summarize:

f(x) = O(g(x)) (big-oh) means that the growth rate of f(x) is asymptotically less than or equal to to the growth rate of g(x).

f(x) = O(g(x)) (big-omega) means that the growth rate of f(x) is asymptotically greater than or equal to the growth rate of g(x)

f(x) = o(g(x)) (little-oh) means that the growth rate of f(x) is asymptotically less than the growth rate of g(x).

f(x) = ?(g(x)) (little-omega) means that the growth rate of f(x) is asymptotically greater than the growth rate of g(x)

f(x) = T(g(x)) (theta) means that the growth rate of f(x) is asymptotically equal to the growth rate of g(x)

For a more detailed discussion, you can read the definition on Wikipedia or consult a classic textbook like Introduction to Algorithms by Cormen et al.

How to describe "object" arguments in jsdoc?

I see that there is already an answer about the @return tag, but I want to give more details about it.

First of all, the official JSDoc 3 documentation doesn't give us any examples about the @return for a custom object. Please see https://jsdoc.app/tags-returns.html. Now, let's see what we can do until some standard will appear.

Function returns object where keys are dynamically generated. Example: {1: 'Pete', 2: 'Mary', 3: 'John'}. Usually, we iterate over this object with the help of for(var key in obj){...}.

Possible JSDoc according to https://google.github.io/styleguide/javascriptguide.xml#JsTypes
```
/**
 * @return {Object.<number, string>}
 */
function getTmpObject() {
    var result = {}
    for (var i = 10; i >= 0; i--) {
        result[i * 3] = 'someValue' + i;
    }
    return result
}
```

Function returns object where keys are known constants. Example: {id: 1, title: 'Hello world', type: 'LEARN', children: {...}}. We can easily access properties of this object: object.id.

Possible JSDoc according to https://groups.google.com/forum/#!topic/jsdoc-users/TMvUedK9tC4

Fake It.

/**
 * Generate a point.
 *
 * @returns {Object} point - The point generated by the factory.
 * @returns {number} point.x - The x coordinate.
 * @returns {number} point.y - The y coordinate.
 */
var pointFactory = function (x, y) {
    return {
        x:x,
        y:y
    }
}

The Full Monty.

/**
 @class generatedPoint
 @private
 @type {Object}
 @property {number} x The x coordinate.
 @property {number} y The y coordinate.
 */
function generatedPoint(x, y) {
    return {
        x:x,
        y:y
    };
}

/**
 * Generate a point.
 *
 * @returns {generatedPoint} The point generated by the factory.
 */

var pointFactory = function (x, y) {
    return new generatedPoint(x, y);
}

Define a type.

/**
 @typedef generatedPoint
 @type {Object}
 @property {number} x The x coordinate.
 @property {number} y The y coordinate.
 */


/**
 * Generate a point.
 *
 * @returns {generatedPoint} The point generated by the factory.
 */

var pointFactory = function (x, y) {
    return {
        x:x,
        y:y
    }
}

According to https://google.github.io/styleguide/javascriptguide.xml#JsTypes

The record type.

/**
 * @return {{myNum: number, myObject}}
 * An anonymous type with the given type members.
 */
function getTmpObject() {
    return {
        myNum: 2,
        myObject: 0 || undefined || {}
    }
}

.ssh directory not being created

Is there a step missing?

Yes. You need to create the directory:

mkdir ${HOME}/.ssh

Additionally, SSH requires you to set the permissions so that only you (the owner) can access anything in ~/.ssh:

% chmod 700 ~/.ssh

Should the .ssh dir be generated when I use the ssh-keygen command?

No. This command generates an SSH key pair but will fail if it cannot write to the required directory:

% ssh-keygen
Generating public/private rsa key pair.
Enter file in which to save the key (/Users/xxx/.ssh/id_rsa): /Users/tmp/does_not_exist
Enter passphrase (empty for no passphrase): 
Enter same passphrase again: 
open /Users/tmp/does_not_exist failed: No such file or directory.
Saving the key failed: /Users/tmp/does_not_exist.

Once you've created your keys, you should also restrict who can read those key files to just yourself:

% chmod -R go-wrx ~/.ssh/*

Build Android Studio app via command line

Cheatsheet for running Gradle from the command line for Android Studio projects on Linux:

cd <project-root>
./gradlew
./gradlew tasks
./gradlew --help

Should get you started..

DELETE ... FROM ... WHERE ... IN

The canonical T-SQL (SqlServer) answer is to use a DELETE with JOIN as such

DELETE o
FROM Orders o
INNER JOIN Customers c
    ON o.CustomerId = c.CustomerId
WHERE c.FirstName = 'sklivvz'

This will delete all orders which have a customer with first name Sklivvz.

How to select id with max date group by category in PostgreSQL?

This is a perfect use-case for DISTINCT ON - a Postgres specific extension of the standard DISTINCT:

SELECT DISTINCT ON (category)
       id  -- , category, date  -- any other column (expression) from the same row
FROM   tbl
ORDER  BY category, date DESC;

Careful with descending sort order. If the column can be NULL, you may want to add NULLS LAST:

Sort by column ASC, but NULL values first?

DISTINCT ON is simple and fast. Detailed explanation in this related answer:

Select first row in each GROUP BY group?

For big tables with many rows per category consider an alternative approach:

Google Map API - Removing Markers

According to Google documentation they said that this is the best way to do it. First create this function to find out how many markers there are/

   function setMapOnAll(map1) {
    for (var i = 0; i < markers.length; i++) {
      markers[i].setMap(map1);
    }
  }

Next create another function to take away all these markers

 function clearMarker(){
setMapOnAll(null);
}

Then create this final function to erase all the markers when ever this function is called upon.

 function delateMarkers(){
clearMarker()
markers = []
//console.log(markers) This is just if you want to

}

Hope that helped good luck

Delete specific values from column with where condition?

UPDATE YourTable SET columnName = null WHERE YourCondition

Writing a dictionary to a text file?

The probelm with your first code block was that you were opening the file as 'r' even though you wanted to write to it using 'w'

with open('/Users/your/path/foo','w') as data:
    data.write(str(dictionary))

AES Encryption for an NSString on the iPhone

@owlstead, regarding your request for "a cryptographically secure variant of one of the given answers," please see RNCryptor. It was designed to do exactly what you're requesting (and was built in response to the problems with the code listed here).

RNCryptor uses PBKDF2 with salt, provides a random IV, and attaches HMAC (also generated from PBKDF2 with its own salt. It support synchronous and asynchronous operation.

How do I "break" out of an if statement?

You probably need to break up your if statement into smaller pieces. That being said, you can do two things:

wrap the statement into do {} while (false) and use real break (not recommended!!! huge kludge!!!)
put the statement into its own subroutine and use return This may be the first step to improving your code.

Best way to get child nodes

The cross browser way to do is to use childNodes to get NodeList, then make an array of all nodes with nodeType ELEMENT_NODE.

/**
 * Return direct children elements.
 *
 * @param {HTMLElement}
 * @return {Array}
 */
function elementChildren (element) {
    var childNodes = element.childNodes,
        children = [],
        i = childNodes.length;

    while (i--) {
        if (childNodes[i].nodeType == 1) {
            children.unshift(childNodes[i]);
        }
    }

    return children;
}

http://jsfiddle.net/s4kxnahu/

This is especially easy if you are using a utility library such as lodash:

/**
 * Return direct children elements.
 *
 * @param {HTMLElement}
 * @return {Array}
 */
function elementChildren (element) {
    return _.where(element.childNodes, {nodeType: 1});
}

Future:

You can use querySelectorAll in combination with :scope pseudo-class (matches the element that is the reference point of the selector):

parentElement.querySelectorAll(':scope > *');

At the time of writing this :scope is supported in Chrome, Firefox and Safari.

remove empty lines from text file with PowerShell

(Get-Content c:\FileWithEmptyLines.txt) | 
    Foreach { $_ -Replace  "Old content", " New content" } | 
    Set-Content c:\FileWithEmptyLines.txt;

What does an exclamation mark before a cell reference mean?

When entered as the reference of a Named range, it refers to range on the sheet the named range is used on.

For example, create a named range MyName refering to =SUM(!B1:!K1)

Place a formula on Sheet1 =MyName. This will sum Sheet1!B1:K1

Now place the same formula (=MyName) on Sheet2. That formula will sum Sheet2!B1:K1

Note: (as pnuts commented) this and the regular SheetName!B1:K1 format are relative, so reference different cells as the =MyName formula is entered into different cells.

how to configure apache server to talk to HTTPS backend server?

Your server tells you exactly what you need : [Hint: SSLProxyEngine]

You need to add that directive to your VirtualHost before the Proxy directives :

SSLProxyEngine on
ProxyPass /primary/store https://localhost:9763/store/
ProxyPassReverse /primary/store https://localhost:9763/store/

See the doc for more detail.

Using isKindOfClass with Swift

The proper Swift operator is is:

if touch.view is UIPickerView {
    // touch.view is of type UIPickerView
}

Of course, if you also need to assign the view to a new constant, then the if let ... as? ... syntax is your boy, as Kevin mentioned. But if you don't need the value and only need to check the type, then you should use the is operator.

Why use static_cast<int>(x) instead of (int)x?

It's about how much type-safety you want to impose.

When you write (bar) foo (which is equivalent to reinterpret_cast<bar> foo if you haven't provided a type conversion operator) you are telling the compiler to ignore type safety, and just do as it's told.

When you write static_cast<bar> foo you are asking the compiler to at least check that the type conversion makes sense and, for integral types, to insert some conversion code.

EDIT 2014-02-26

I wrote this answer more than 5 years ago, and I got it wrong. (See comments.) But it still gets upvotes!

How to split a python string on new line characters

? Splitting line in Python:

Have you tried using str.splitlines() method?:

From the docs:

str.splitlines([keepends])

Return a list of the lines in the string, breaking at line boundaries. Line breaks are not included in the resulting list unless keepends is given and true.

For example:

>>> 'Line 1\n\nLine 3\rLine 4\r\n'.splitlines()
['Line 1', '', 'Line 3', 'Line 4']

>>> 'Line 1\n\nLine 3\rLine 4\r\n'.splitlines(True)
['Line 1\n', '\n', 'Line 3\r', 'Line 4\r\n']

Which delimiters are considered?

This method uses the universal newlines approach to splitting lines.

The main difference between Python 2.X and Python 3.X is that the former uses the universal newlines approach to splitting lines, so "\r", "\n", and "\r\n" are considered line boundaries for 8-bit strings, while the latter uses a superset of it that also includes:

\v or \x0b: Line Tabulation (added in Python 3.2).
\f or \x0c: Form Feed (added in Python 3.2).
\x1c: File Separator.
\x1d: Group Separator.
\x1e: Record Separator.
\x85: Next Line (C1 Control Code).
\u2028: Line Separator.
\u2029: Paragraph Separator.

splitlines VS split:

Unlike str.split() when a delimiter string sep is given, this method returns an empty list for the empty string, and a terminal line break does not result in an extra line:

>>> ''.splitlines()
[]

>>> 'Line 1\n'.splitlines()
['Line 1']

While str.split('\n') returns:

>>> ''.split('\n')
['']

>>> 'Line 1\n'.split('\n')
['Line 1', '']

?? Removing additional whitespace:

If you also need to remove additional leading or trailing whitespace, like spaces, that are ignored by str.splitlines(), you could use str.splitlines() together with str.strip():

>>> [str.strip() for str in 'Line 1  \n  \nLine 3 \rLine 4 \r\n'.splitlines()]
['Line 1', '', 'Line 3', 'Line 4']

? Removing empty strings (''):

Lastly, if you want to filter out the empty strings from the resulting list, you could use filter():

>>> # Python 2.X:
>>> filter(bool, 'Line 1\n\nLine 3\rLine 4\r\n'.splitlines())
['Line 1', 'Line 3', 'Line 4']

>>> # Python 3.X:
>>> list(filter(bool, 'Line 1\n\nLine 3\rLine 4\r\n'.splitlines()))
['Line 1', 'Line 3', 'Line 4']

Additional comment regarding the original question:

As the error you posted indicates and Burhan suggested, the problem is from the print. There's a related question about that could be useful to you: UnicodeEncodeError: 'charmap' codec can't encode - character maps to <undefined>, print function

Rails select helper - Default selected value, how?

<%= f.select :project_id, @project_select, :selected => params[:pid] %>

How to generate List<String> from SQL query?

I think this is what you're looking for.

List<String> columnData = new List<String>();

using(SqlConnection connection = new SqlConnection("conn_string"))
{
    connection.Open();
    string query = "SELECT Column1 FROM Table1";
    using(SqlCommand command = new SqlCommand(query, connection))
    {
        using (SqlDataReader reader = command.ExecuteReader())
        {
            while (reader.Read())
            {
                columnData.Add(reader.GetString(0));
            }         
        }
    }
}

Not tested, but this should work fine.

Passing ArrayList from servlet to JSP

<html>
    <%

        ArrayList<Actor> list = new ArrayList<Actor>();
        list = (ArrayList<Actor>) request.getAttribute("actors");
    %>
<head>
    <link rel="stylesheet" type="text/css" href="style.css">
    <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
    <title>Actor</title>
</head>

<body>

    <h2>This is Actor Class</h2>
    <table>
        <thead>
            <tr>
                <th>Id</th>
                <th>First Name</th>
                <th>Last Name</th>
            </tr>
        </thead>
        <tbody>
            <% for(int i = 0; i < list.size(); i++) {
                Actor actor = new Actor();
                actor = list.get(i);
                //out.println(actor.getId());
                //out.println(actor.getFirstname());
                //out.println(actor.getLastname());
            %>


            <tr>
                <td><%=actor.getId()%></td>
                <td><%=actor.getFirstname()%></td>
                <td><%=actor.getLastname()%></td>
               </tr>
            <%
            };
            %>
        </tbody>
    </table>

</body>

Get current date in DD-Mon-YYY format in JavaScript/Jquery

I've made a custom date string format function, you can use that.

var  getDateString = function(date, format) {
        var months = ['Jan', 'Feb', 'Mar', 'Apr', 'May', 'Jun', 'Jul', 'Aug', 'Sep', 'Oct', 'Nov', 'Dec'],
        getPaddedComp = function(comp) {
            return ((parseInt(comp) < 10) ? ('0' + comp) : comp)
        },
        formattedDate = format,
        o = {
            "y+": date.getFullYear(), // year
            "M+": months[date.getMonth()], //month
            "d+": getPaddedComp(date.getDate()), //day
            "h+": getPaddedComp((date.getHours() > 12) ? date.getHours() % 12 : date.getHours()), //hour
             "H+": getPaddedComp(date.getHours()), //hour
            "m+": getPaddedComp(date.getMinutes()), //minute
            "s+": getPaddedComp(date.getSeconds()), //second
            "S+": getPaddedComp(date.getMilliseconds()), //millisecond,
            "b+": (date.getHours() >= 12) ? 'PM' : 'AM'
        };

        for (var k in o) {
            if (new RegExp("(" + k + ")").test(format)) {
                formattedDate = formattedDate.replace(RegExp.$1, o[k]);
            }
        }
        return formattedDate;
    };

And now suppose you've :-

    var date = "2014-07-12 10:54:11";

So to format this date you write:-

var formattedDate = getDateString(new Date(date), "d-M-y")

Problems installing the devtools package

I worked through a number of issues installing all of the following to get devtools to install on Ubuntu 18.04.1.

sudo apt-get install libcurl4-openssl-dev
sudo apt-get install libssl-dev
sudo apt-get install libcurl4-gnutls-dev
sudo apt-get install libxml2-dev

Jquery split function

Javascript String objects have a split function, doesn't really need to be jQuery specific

 var str = "nice.test"
 var strs = str.split(".")

strs would be

 ["nice", "test"]

I'd be tempted to use JSON in your example though. The php could return the JSON which could easily be parsed

 success: function(data) {
   var items = JSON.parse(data)
 }

How to Select Every Row Where Column Value is NOT Distinct

How about

SELECT EmailAddress, CustomerName FROM Customers a
WHERE Exists ( SELECT emailAddress FROM customers c WHERE a.customerName != c.customerName AND a.EmailAddress = c.EmailAddress)

How to set the range of y-axis for a seaborn boxplot?

It is standard matplotlib.pyplot:

...
import matplotlib.pyplot as plt
plt.ylim(10, 40)

Or simpler, as mwaskom comments below:

ax.set(ylim=(10, 40))

html5 audio player - jquery toggle click play/pause?

You can call native methods trough trigger in jQuery. Just do this:

$('.play').trigger("play");

And the same for pause: $('.play').trigger("pause");

EDIT: as F... pointed out in the comments, you can do something similar to access properties: $('.play').prop("paused");

Android RelativeLayout programmatically Set "centerInParent"

Just to add another flavor from the Reuben response, I use it like this to add or remove this rule according to a condition:

    RelativeLayout.LayoutParams layoutParams =
            (RelativeLayout.LayoutParams) holder.txtGuestName.getLayoutParams();

    if (SOMETHING_THAT_WOULD_LIKE_YOU_TO_CHECK) {
        // if true center text:
        layoutParams.addRule(RelativeLayout.CENTER_IN_PARENT);
        holder.txtGuestName.setLayoutParams(layoutParams);
    } else {
        // if false remove center:
        layoutParams.addRule(RelativeLayout.CENTER_IN_PARENT, 0);
        holder.txtGuestName.setLayoutParams(layoutParams);
    }

Mongoose, update values in array of objects

model.update({"_id": 1, "items.id": "2"}, 
{$set: {"items.$.name": "yourValue","items.$.value": "yourvalue"}})

Mongodb document

How do I install a module globally using npm?

You might not have write permissions to install a node module in the global location such as /usr/local/lib/node_modules, in which case run npm install -g package as root.

OpenCV Error: (-215)size.width>0 && size.height>0 in function imshow

cv2.circle and cv2.lines are not working. Mask and frame both are returning None. these functions (line and circle) are in opencv 3 but not in older versions.

Formatting a float to 2 decimal places

string outString= number.ToString("####0.00");

Not able to install Python packages [SSL: TLSV1_ALERT_PROTOCOL_VERSION]

For all the python3 and pip3 users out there:

curl https://bootstrap.pypa.io/get-pip.py | sudo python3

and then assume you want to install pandas

pip3 install pandas --user

Initializing a two dimensional std::vector

Suppose you want to initialize a two dimensional integer vector with n rows and m column each having value 'VAL'

Write it as

std::vector<vector<int>> arr(n, vector<int>(m,VAL));

This VAL can be a integer type variable or constant such as 100

Delete all SYSTEM V shared memory and semaphores on UNIX-like systems

This is how I do it in FreeBSD:

#!/usr/local/bin/bash
for i in $(ipcs -a | grep "^s" | awk '{ print $2 }');
do
        echo "ipcrm -s $i"
        ipcrm -s $i
done

HTML 5 video or audio playlist

To add to the current answers, here is a playlist of videos which works with separate subtitle files. At the end of the playlist, it will go to endPage

<video id="video" controls autoplay preload="metadata">
   <source src="vid1.mp4" type="mp4">
   <track id="subs" label="English" kind="subtitles" srclang="en" src="sub1.vtt" default>
</video>

<script type="text/javascript">
var endPage = "duckduckgo.com";
var playlist = [
    { 
        'file': 'vid2.mp4',
        'subtitle': 'sub2.vtt'
    },{
        'file': 'vid3.mp4',
        'subtitle': 'sub3.vtt'
    }
]
var i = 0;
var videoPlayer = document.getElementById('video');
var subtitles = document.getElementById('subs');
videoPlayer.onended = function(){
    if(i < playlist.length){
        videoPlayer.src = playlist[i].file;
        subtitles.src = playlist[i].subtitle;
        i++;
    } else {
        console.log("We are leaving")
        document.location.href = endPage;
    }
}
</script>

Not equal string

Try this:

if(myString != "-1")

The opperand is != and not =!

You can also use Equals

if(!myString.Equals("-1"))

Note the ! before myString

How to create a sticky footer that plays well with Bootstrap 3

The best way is to do the following:
HTML:Sticky Footer
CSS: CSS for Sticky Footer
HTML Code Sample:

<div class="container">
  <div class="page-header">
    <h1>Sticky footer</h1>
  </div>
  <p class="lead">Pin a fixed-height footer to the bottom of the viewport in desktop browsers with this custom HTML and CSS.</p>
  <p>Use <a href="../sticky-footer-navbar">the sticky footer with a fixed navbar</a> if need be, too.</p>
</div>

<footer class="footer">
  <div class="container">
    <p class="text-muted">Place sticky footer content here.</p>
  </div>
</footer>

CSS Code Sample:

    html {
  position: relative;
  min-height: 100%;
}
body {
  /* Margin bottom by footer height */
  margin-bottom: 60px;
}
.footer {
  position: absolute;
  bottom: 0;
  width: 100%;
  /* Set the fixed height of the footer here */
  height: 60px;
  background-color: #f5f5f5;
}

Another little tweak might make it more perfect (depends on your project), so it will not affect footer on mobile views.

@media (max-width:768px){ .footer{position:absolute;width:100%;} }
@media (min-width:768px){ .footer{position:absolute;bottom:0;height:60px;width:100%;}}

Is there a bash command which counts files?

You can use the -R option to find the files along with those inside the recursive directories

ls -R | wc -l // to find all the files

ls -R | grep log | wc -l // to find the files which contains the word log

you can use patterns on the grep

How to check if an array value exists?

You could use the PHP in_array function

if( in_array( "bla" ,$yourarray ) )
{
    echo "has bla";
}

justify-content property isn't working

I had a further issue that foxed me for a while when theming existing code from a CMS. I wanted to use flexbox with justify-content:space-between but the left and right elements weren't flush.

In that system the items were floated and the container had a :before and/or an :after to clear floats at beginning or end. So setting those sneaky :before and :after elements to display:none did the trick.

Programs & Examples On #Pastebin

How to clear Flutter's Build cache?

Node.js heap out of memory

Session 'app': Error Launching activity

Bootstrap : TypeError: $(...).modal is not a function

Android Error [Attempt to invoke virtual method 'void android.app.ActionBar' on a null object reference]

IE11 meta element Breaks SVG

sudo service mongodb restart gives "unrecognized service error" in ubuntu 14.0.4

Android Studio - Unable to find valid certification path to requested target

SyntaxError: JSON.parse: unexpected character at line 1 column 1 of the JSON data

Plotting a fast Fourier transform in Python

In response to the raw data and comments being posted

Swap x and y axis without manually swapping values

Composer Update Laravel

SEVERE: Unable to create initial connections of pool - tomcat 7 with context.xml file

Install Visual Studio 2013 on Windows 7

Can not deserialize instance of java.lang.String out of START_OBJECT token

The APR based Apache Tomcat Native library was not found on the java.library.path

The POM for project is missing, no dependency information available

Getting error: Peer authentication failed for user "postgres", when trying to get pgsql working with rails

$apply already in progress error

Grouped bar plot in ggplot

TypeError: 'undefined' is not an object

Uncaught ReferenceError: function is not defined with onclick

WARNINGS:

Maven compile: package does not exist

Linq: GroupBy, Sum and Count

Creating a Shopping Cart using only HTML/JavaScript

Invalid column count in CSV input on line 1 Error

Parse error: syntax error, unexpected T_ECHO in

Convert Base64 string to an image file?

Java SSLHandshakeException "no cipher suites in common"

How to display binary data as image - extjs 4

Errno 10060] A connection attempt failed because the connected party did not properly respond after a period of time

XAMPP Apache won't start

Fatal error: Out of memory, but I do have plenty of memory (PHP)

Javascript : calling function from another file

Unstaged changes left after git reset --hard

Very Simple, Very Smooth, JavaScript Marquee

JTable - Selected Row click event

Moving matplotlib legend outside of the axis makes it cutoff by the figure box

Binary Data Posting with curl

Can not connect to local PostgreSQL

Android: show/hide status bar/power bar

Adding timestamp to a filename with mv in BASH

Could not find an implementation of the query pattern

Python: maximum recursion depth exceeded while calling a Python object

Removing all script tags from html with JS Regular Expression

How do I compile a .cpp file on Linux?

Disable Buttons in jQuery Mobile

Fast and Lean PDF Viewer for iPhone / iPad / iOS - tips and hints?

Performance of FOR vs FOREACH in PHP

What's is the difference between train, validation and test set, in neural networks?

MySQL SELECT x FROM a WHERE NOT IN ( SELECT x FROM b ) - Unexpected result

MySQL joins and COUNT(*) from another table

how to call a method in another Activity from Activity

Command CompileSwift failed with a nonzero exit code in Xcode 10

How to get your Netbeans project into Eclipse

how to fix EXE4J_JAVA_HOME, No JVM could be found on your system error?

CSS3's border-radius property and border-collapse:collapse don't mix. How can I use border-radius to create a collapsed table with rounded corners?

Convert HTML + CSS to PDF

Where is the syntax for TypeScript comments documented?

QComboBox - set selected item based on the item's data

How do I make a matrix from a list of vectors in R?

Difference between Destroy and Delete

How to pass arguments to addEventListener listener function?

Is there a css cross-browser value for "width: -moz-fit-content;"?

How to set different colors in HTML in one statement?

center image in div with overflow hidden

Printing 1 to 1000 without loop or conditionals

How do I invoke a Java method when given the method name as a string?

Removing carriage return and new-line from the end of a string in c#

How to use border with Bootstrap

In Python script, how do I set PYTHONPATH?

How to set selected index JComboBox by value

How can I get LINQ to return the object which has the max value for a given property?

How do I install PIL/Pillow for Python 3.6?

Line break in SSRS expression

Using a RegEx to match IP addresses in Python

C# static class constructor