Xcode Simulator: how to remove older unneeded devices?

In Xcode 6 and above, you can find and delete the simulators from the path /Library/Developer/CoreSimulator/Profiles/Runtimes. Restart Xcode in order to take effect (may not be needed).

Java Web Service client basic authentication

If you use JAX-WS, the following works for me:

    //Get Web service Port
    WSTestService wsService = new WSTestService();
    WSTest wsPort = wsService.getWSTestPort();

    // Add username and password for Basic Authentication
    Map<String, Object> reqContext = ((BindingProvider) 
         wsPort).getRequestContext();
    reqContext.put(BindingProvider.USERNAME_PROPERTY, "username");
        reqContext.put(BindingProvider.PASSWORD_PROPERTY, "password");

Defining private module functions in python

Python has three modes via., private, public and protected .While importing a module only public mode is accessible .So private and protected modules cannot be called from outside of the module i.e., when it is imported .

load scripts asynchronously

Example from google

<script type="text/javascript">
  (function() {
    var po = document.createElement('script'); po.type = 'text/javascript'; po.async = true;
    po.src = 'https://apis.google.com/js/plusone.js?onload=onLoadCallback';
    var s = document.getElementsByTagName('script')[0]; s.parentNode.insertBefore(po, s);
  })();
</script>

Get a worksheet name using Excel VBA

This works for me.

worksheetName = ActiveSheet.Name

PermissionError: [WinError 5] Access is denied python using moviepy to write gif

I got the same error when an imported library was trying to create a directory at path "./logs/".

It turns out that the library was trying to create it at the wrong location, i.e. inside the folder of my python interpreter instead of the base project directory. I solved the issue by setting the "Working directory" path to my project folder inside the "Run Configurations" menu of PyCharm. If instead you're using the terminal to run your code, maybe you just need to move inside the project folder before running it.

How to check if a text field is empty or not in swift

A compact little gem for Swift 2 / Xcode 7

@IBAction func SubmitAgeButton(sender: AnyObject) {

    let newAge = String(inputField.text!)        

if ((textField.text?.isEmpty) != false) {
        label.text = "Enter a number!"
    }
    else {
        label.text = "Oh, you're \(newAge)"

        return
    }

    }

How to get the last element of a slice?

Bit less elegant but can also do:

sl[len(sl)-1: len(sl)]

jQuery get textarea text

Why would you want to convert key strokes to text? Add a button that sends the text inside the textarea to the server when clicked. You can get the text using the value attribute as the poster before has pointed out, or using jQuery's API:

$('input#mybutton').click(function() {
    var text = $('textarea#mytextarea').val();
    //send to server and process response
});

How can I enable auto complete support in Notepad++?

You can also add your own suggestion.

Open this path:

C:\Program Files\Notepad++\plugins\APIs

And open the XML file of the language, such as php.xml. Here suppose, you would like to add addcslashes, so just add this XML code.

<KeyWord name="addcslashes" func="yes">
    <Overload retVal="void">
        <Param name="void"/>
    </Overload>
</KeyWord>

Oracle 10g: Extract data (select) from XML (CLOB Type)

In case of :

<?xml version="1.0" encoding="iso-8859-1"?>
<info xmlns="http://namespaces.default" xmlns:ns2="http://namespaces.ns2" >
    <id> 954 </id>
    <idboss> 954 </idboss>
    <name> Fausto </name>
    <sorname> Anonimo </sorname>
    <phone> 040000000 </phone>
    <fax> 040000001 </fax>
</info>

Query :

Select *
from xmltable(xmlnamespaces(default 'http://namespaces.default'
                              'http://namespaces.ns2' as "ns",
                       ), 
                '/info'
                passing xmltype.createxml(xml) 
                columns id varchar2(10) path '/id',
                        idboss varchar2(500) path '/idboss',
                        etc....

                ) nice_xml_table

How to get the range of occupied cells in excel sheet

See the Range.SpecialCells method. For example, to get cells with constant values or formulas use:

_xlWorksheet.UsedRange.SpecialCells(
        Microsoft.Office.Interop.Excel.XlCellType.xlCellTypeConstants |
        Microsoft.Office.Interop.Excel.XlCellType.xlCellTypeFormulas)

Bootstrap throws Uncaught Error: Bootstrap's JavaScript requires jQuery

On official docs: https://electronjs.org/docs/faq#i-can-not-use-jqueryrequirejsmeteorangularjs-in-electron

<head>
  <script>
  window.nodeRequire = require;
  delete window.require;
  delete window.exports;
  delete window.module;
  </script>
  <script type="text/javascript" src="jquery.js"></script>
</head>

How to recursively download a folder via FTP on Linux

toggle the prompt by PROMPT command.

Usage:

ftp>cd /to/directory    
ftp>prompt    
ftp>mget  *

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

I agree with Tom van der Woerdt. You could use CSS to hide the video (visibility:hidden or overflow:hidden in a div wrapper constrained by height), but that may violate Youtube's policies. Additionally, how could you control the audio (pause, stop, volume, etc.)?

You could instead turn to resources such as http://www.houndbite.com/ to manage audio.

Putting GridView data in a DataTable

Copying Grid to datatable

        if (GridView.Rows.Count != 0)
        {
            //Forloop for header
            for (int i = 0; i < GridView.HeaderRow.Cells.Count; i++)
            {
                dt.Columns.Add(GridView.HeaderRow.Cells[i].Text);
            }
            //foreach for datarow
            foreach (GridViewRow row in GridView.Rows)
            {
                DataRow dr = dt.NewRow();
                for (int j = 0; j < row.Cells.Count; j++)
                {
                    dr[GridView.HeaderRow.Cells[j].Text] = row.Cells[j].Text;
                }
                dt.Rows.Add(dr);
            }
            //Loop for footer
            if (GridView.FooterRow.Cells.Count != 0)
            {
                DataRow dr = dt.NewRow();
                for (int i = 0; i < GridView.FooterRow.Cells.Count; i++)
                {
                    //You have to re-do the work if you did anything in databound for footer.  
                }
                dt.Rows.Add(dr);
            }
            dt.TableName = "tb";
        }

How to use random in BATCH script?

And just to be completely random, a total lack of order: SET /A V=%random% %%15 +1

@(IF not "%1" == "max" (start /MAX cmd /Q /C %0 max&X)ELSE set C=1&set V=A&wmic process where name="cmd.exe" CALL setpriority "REALTIME">NUL)&CLS
:Y
(IF %V% EQU 10 set V=A)&(IF %V% EQU 11 set V=B)&(IF %V% EQU 12 set V=C)&(IF %V% EQU 13 set V=D)&(IF %V% EQU 14 set V=E)&(IF %V% EQU 15 set V=F)
title %V%%random%6%random%%random%%random%%random%9%random%%random%%random%%random%%random%%random%%random%%random%%random%%random%%random%%random%&color %V%&ECHO %random%%C%%random%%random%%random%%random%6%random%9%random%%random%%random%%random%%random%%random%%random%%random%%random%&(IF %C% EQU 46 (TIMEOUT /T 1 /NOBREAK>nul&set C=1&CLS&SET /A V=%random% %%15 +1)ELSE set /A C=%C%+1)&goto Y

How to customise file type to syntax associations in Sublime Text?

I've found the answer (by further examining the Sublime 2 config files structure):

I was to open

~/.config/sublime-text-2/Packages/Scala/Scala.tmLanguage

And edit it to add sbt (the extension of files I want to be opened as Scala code files) to the array after the fileTypes key:

<dict>
  <key>bundleUUID</key>
  <string>452017E8-0065-49EF-AB9D-7849B27D9367</string>
  <key>fileTypes</key>
  <array>
    <string>scala</string>
    <string>sbt</string>
  <array>
  ...

PS: May there be a better way, something like a right place to put my customizations (insted of modifying packages themselves), I'd still like to know.

Which versions of SSL/TLS does System.Net.WebRequest support?

I also put an answer there, but the article @Colonel Panic's update refers to suggests forcing TLS 1.2. In the future, when TLS 1.2 is compromised or just superceded, having your code stuck to TLS 1.2 will be considered a deficiency. Negotiation to TLS1.2 is enabled in .Net 4.6 by default. If you have the option to upgrade your source to .Net 4.6, I would highly recommend that change over forcing TLS 1.2.

If you do force TLS 1.2, strongly consider leaving some type of breadcrumb that will remove that force if you do upgrade to the 4.6 or higher framework.

How to set Android camera orientation properly?

I faced the issue when i was using ZBar for scanning in tabs. Camera orientation issue. Using below code i was able to resolve issue. This is not the whole code snippet, Please take only help from this.

 public void surfaceChanged(SurfaceHolder holder, int format, int width,
                               int height) {
     if (isPreviewRunning) {
            mCamera.stopPreview();
        }

 setCameraDisplayOrientation(mCamera);

        previewCamera();

    }



 public void previewCamera() {

        try {
            // Hard code camera surface rotation 90 degs to match Activity view
            // in portrait
            mCamera.setPreviewDisplay(mHolder);
            mCamera.setPreviewCallback(previewCallback);
            mCamera.startPreview();
            mCamera.autoFocus(autoFocusCallback);
            isPreviewRunning = true;
        } catch (Exception e) {
            Log.d("DBG", "Error starting camera preview: " + e.getMessage());
        }


    }


public void setCameraDisplayOrientation(android.hardware.Camera camera) {
        Camera.Parameters parameters = camera.getParameters();

        android.hardware.Camera.CameraInfo camInfo =
                new android.hardware.Camera.CameraInfo();
        android.hardware.Camera.getCameraInfo(getBackFacingCameraId(), camInfo);


        Display display = ((WindowManager) context.getSystemService(Context.WINDOW_SERVICE)).getDefaultDisplay();
        int rotation = display.getRotation();
        int degrees = 0;
        switch (rotation) {
            case Surface.ROTATION_0:
                degrees = 0;
                break;
            case Surface.ROTATION_90:
                degrees = 90;
                break;
            case Surface.ROTATION_180:
                degrees = 180;
                break;
            case Surface.ROTATION_270:
                degrees = 270;
                break;
        }

        int result;
        if (camInfo.facing == Camera.CameraInfo.CAMERA_FACING_FRONT) {
            result = (camInfo.orientation + degrees) % 360;
            result = (360 - result) % 360;  // compensate the mirror
        } else {  // back-facing
            result = (camInfo.orientation - degrees + 360) % 360;
        }
        camera.setDisplayOrientation(result);
    }




    private int getBackFacingCameraId() {
        int cameraId = -1;
        // Search for the front facing camera
        int numberOfCameras = Camera.getNumberOfCameras();
        for (int i = 0; i < numberOfCameras; i++) {
            Camera.CameraInfo info = new Camera.CameraInfo();
            Camera.getCameraInfo(i, info);
            if (info.facing == Camera.CameraInfo.CAMERA_FACING_BACK) {

                cameraId = i;
                break;
            }
        }
        return cameraId;
    }

Converting strings to floats in a DataFrame

you have to replace empty strings ('') with np.nan before converting to float. ie:

df['a']=df.a.replace('',np.nan).astype(float)

Change the image source on rollover using jQuery

I was hoping for an über one liner like:

$("img.screenshot").attr("src", $(this).replace("foo", "bar"));

How to get Latitude and Longitude of the mobile device in android?

Update 2020: Using Kotlin Coroutine to get Lat, lang & Address of the Device

This is an old question and most answers are outdated. This is how I do it my apps now:

This class help to track the device location and return list of Address of device using Geocoding. Put it in some util class

import android.Manifest
import android.app.AlertDialog
import android.content.Context
import android.content.Intent
import android.content.pm.PackageManager
import android.location.*
import android.os.Bundle
import android.provider.Settings
import android.util.Log
import androidx.core.app.ActivityCompat
import com.bmw.weatherapp.R
import kotlinx.coroutines.*
import java.io.IOException
import java.lang.ref.WeakReference
import java.util.*
import kotlin.coroutines.CoroutineContext

/**
 * Use GPS or Network Provider to get Device Location
 */
class DeviceLocationTracker(context: Context, deviceLocationListener: DeviceLocationListener) : LocationListener, CoroutineScope {
    private var deviceLocation: Location? = null
    private val context: WeakReference<Context>
    private var locationManager: LocationManager? = null
    private var deviceLocationListener: DeviceLocationListener
    private val job = Job()
    override val coroutineContext: CoroutineContext
        get() = job + Dispatchers.Main

    init {
        this.context = WeakReference(context)
        this.deviceLocationListener = deviceLocationListener
        initializeLocationProviders()
    }

    private fun initializeLocationProviders() {
        //Init Location Manger if not already initialized
        if (null == locationManager) {
            locationManager = context.get()
                    ?.getSystemService(Context.LOCATION_SERVICE) as LocationManager
        }
        locationManager?.apply {
            // flag for GPS status
            val isGPSEnabled = isProviderEnabled(LocationManager.GPS_PROVIDER)

            // flag for network status
            val isNetworkEnabled = isProviderEnabled(LocationManager.PASSIVE_PROVIDER)

            //If we have permission
            if (ActivityCompat.checkSelfPermission(context.get()!!, Manifest.permission.ACCESS_FINE_LOCATION)
                    == PackageManager.PERMISSION_GRANTED &&
                    ActivityCompat.checkSelfPermission(context.get()!!, Manifest.permission.ACCESS_COARSE_LOCATION)
                    == PackageManager.PERMISSION_GRANTED) {

                //First Try GPS
                if (isGPSEnabled) {
                    requestLocationUpdates(
                            LocationManager.GPS_PROVIDER,
                            UPDATE_FREQUENCY_TIME,
                            UPDATE_FREQUENCY_DISTANCE.toFloat(), this@DeviceLocationTracker)
                    deviceLocation = locationManager!!.getLastKnownLocation(LocationManager.GPS_PROVIDER)
                } else {
                    // Show alert to open GPS
                    context.get()?.apply {
                        AlertDialog.Builder(this)
                                .setTitle(getString(R.string.title_enable_gps))
                                .setMessage(getString(R.string.desc_enable_gps))
                                .setPositiveButton(getString(R.string.btn_settings)
                                ) { dialog, which ->
                                    val intent = Intent(
                                            Settings.ACTION_LOCATION_SOURCE_SETTINGS)
                                    startActivity(intent)
                                }.setNegativeButton(getString(R.string.btn_cancel))
                                { dialog, which -> dialog.cancel() }.show()
                    }
                }

                //If failed try using NetworkManger
                if(null==deviceLocation && isNetworkEnabled) {
                    requestLocationUpdates(
                            LocationManager.PASSIVE_PROVIDER,
                            0, 0f,
                            this@DeviceLocationTracker)
                    deviceLocation = locationManager!!.getLastKnownLocation(LocationManager.NETWORK_PROVIDER)
                }
            }
        }
    }

    /**
     * Stop using GPS listener
     * Must call this function to stop using GPS
     */
    fun stopUpdate() {
        if (locationManager != null) {
            locationManager!!.removeUpdates(this@DeviceLocationTracker)
        }
    }

    override fun onLocationChanged(newDeviceLocation: Location) {
        deviceLocation = newDeviceLocation
        launch(Dispatchers.Main) {
            withContext(Dispatchers.IO) {
                var addressList: List<Address?>? = null
                try {
                    addressList = Geocoder(context.get(),
                            Locale.ENGLISH).getFromLocation(
                            newDeviceLocation.latitude,
                            newDeviceLocation.longitude,
                            1)
                    deviceLocationListener.onDeviceLocationChanged(addressList)
                    Log.i(TAG, "Fetch address list"+addressList)

                } catch (e: IOException) {
                    Log.e(TAG, "Failed Fetched Address List")
                }
            }
        }
    }

    override fun onProviderDisabled(provider: String) {}
    override fun onProviderEnabled(provider: String) {}
    override fun onStatusChanged(provider: String, status: Int, extras: Bundle) {}
    interface DeviceLocationListener {
        fun onDeviceLocationChanged(results: List<Address>?)
    }

    companion object {
        // The minimum distance to change Updates in meters
        private const val UPDATE_FREQUENCY_DISTANCE: Long = 1 // 10 meters

        // The minimum time between updates in milliseconds
        private const val UPDATE_FREQUENCY_TIME: Long = 1 // 1 minute
        private val TAG = DeviceLocationTracker::class.java.simpleName
    }
}

Add Strings for alert dialog in case GPS is disabled

   <string name="title_enable_gps">Enable GPS</string>
   <string name="desc_enable_gps">GPS is not enabled. Do you want to go to settings menu?</string>
    <string name="btn_settings">Open Settings</string>
    <string name="btn_cancel">Cancel</string>

Add these permission in your Android manifest and request them in app start

<uses-permission android:name="android.permission.INTERNET" />
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
<uses-permission android:name="android.permission.ACCESS_GPS" />
<uses-permission android:name="android.permission.ACCESS_LOCATION" />
<uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" />
<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />

Usage

Implement DeviceLocationListener in your Activity/Fragment class

  class MainActivity : AppCompatActivity, DeviceLocationTracker.DeviceLocationListener {

Override onDeviceLocationChanged callback. You will get current location in onDeviceLocationChanged

  override fun onDeviceLocationChanged(results: List<Address>?) {
        val currntLocation = results?.get(0);
        currntLocation?.apply {
             currentlLat = latitude
             currentLng = longitude
             Country = countryCode
             cityName = getAddressLine(0)
          
        }

    }

To start tracking create a DeviceLocationTracker object in onCreate method of your. Pass the Activity as Context & this as DeviceLocationListener.

private lateinit var deviceLocationTracker: DeviceLocationTracker

override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_main)
        ...
        deviceLocationTracker= DeviceLocationTracker(this, this)

That is it, now you will start to get location update in onDeviceLocationChanged.

How do I get the time of day in javascript/Node.js?

You should checkout the Date object.

In particular, you can look at the getHours() method for the Date object.

getHours() return the time from 0 - 23, so make sure to deal with it accordingly. I think 0-23 is a bit more intuitive since military time runs from 0 - 23, but it's up to you.

With that in mind, the code would be something along the lines of:

var date = new Date();
var current_hour = date.getHours();

How can I make content appear beneath a fixed DIV element?

Here's a responsive way of doing it with jQuery.

 $(window).resize(function () {
      $('#YourRelativeDiv').css('margin-top', $('#YourFixedDiv').height());
 });

AttributeError: 'module' object has no attribute 'urlopen'

import urllib.request as ur
s = ur.urlopen("http://www.google.com")
sl = s.read()
print(sl)

In Python v3 the "urllib.request" is a module by itself, therefore "urllib" cannot be used here.

How to know if .keyup() is a character key (jQuery)

You can't do this reliably with the keyup event. If you want to know something about the character that was typed, you have to use the keypress event instead.

The following example will work all the time in most browsers but there are some edge cases that you should be aware of. For what is in my view the definitive guide on this, see http://unixpapa.com/js/key.html.

$("input").keypress(function(e) {
    if (e.which !== 0) {
        alert("Charcter was typed. It was: " + String.fromCharCode(e.which));
    }
});

keyup and keydown give you information about the physical key that was pressed. On standard US/UK keyboards in their standard layouts, it looks like there is a correlation between the keyCode property of these events and the character they represent. However, this is not reliable: different keyboard layouts will have different mappings.

Git Bash is extremely slow on Windows 7 x64

It appears that completely uninstalling Git, restarting (the classic Windows cure), and reinstalling Git was the cure. I also wiped out all bash config files which were left over (they were manually created). Everything is fast again.

If for some reason reinstalling isn't possible (or desirable), then I would definitely try changing the PS1 variable referenced in Chris Dolan's answer; it resulted in significant speedups in certain operations.

Determine the size of an InputStream

When explicitly dealing with a ByteArrayInputStream then contrary to some of the comments on this page you can use the .available() function to get the size. Just have to do it before you start reading from it.

From the JavaDocs:

Returns the number of remaining bytes that can be read (or skipped over) from this input stream. The value returned is count - pos, which is the number of bytes remaining to be read from the input buffer.

https://docs.oracle.com/javase/7/docs/api/java/io/ByteArrayInputStream.html#available()

gcc: undefined reference to

Are you mixing C and C++? One issue that can occur is that the declarations in the .h file for a .c file need to be surrounded by:

#if defined(__cplusplus)
  extern "C" {                 // Make sure we have C-declarations in C++ programs
#endif

and:

#if defined(__cplusplus)
  }
#endif

Note: if unable / unwilling to modify the .h file(s) in question, you can surround their inclusion with extern "C":

extern "C" {
#include <abc.h>
} //extern

libstdc++-6.dll not found

I placed the libstdc++-6.dll file in the same folder where exe file is generated.

MySQL case sensitive query

To improve James' excellent answer:

It's better to put BINARY in front of the constant instead:

SELECT * FROM `table` WHERE `column` = BINARY 'value'

Putting BINARY in front of column will prevent the use of any index on that column.

Reading text files using read.table

From ?read.table: The number of data columns is determined by looking at the first five lines of input (or the whole file if it has less than five lines), or from the length of col.names if it is specified and is longer. This could conceivably be wrong if fill or blank.lines.skip are true, so specify col.names if necessary.

So, perhaps your data file isn't clean. Being more specific will help the data import:

d = read.table("foobar.txt", 
               sep="\t", 
               col.names=c("id", "name"), 
               fill=FALSE, 
               strip.white=TRUE)

will specify exact columns and fill=FALSE will force a two column data frame.

Running shell command and capturing the output

This is a tricky but super simple solution which works in many situations:

import os
os.system('sample_cmd > tmp')
print open('tmp', 'r').read()

A temporary file(here is tmp) is created with the output of the command and you can read from it your desired output.

Extra note from the comments: You can remove the tmp file in the case of one-time job. If you need to do this several times, there is no need to delete the tmp.

os.remove('tmp')

Code coverage with Mocha

Blanket.js works perfect too.

npm install --save-dev blanket

in front of your test/tests.js

require('blanket')({
    pattern: function (filename) {
        return !/node_modules/.test(filename);
    }
});

run mocha -R html-cov > coverage.html

Maven error :Perhaps you are running on a JRE rather than a JDK?

I was facing the same issue in eclipse maven project, all i did was
right click on the project
maven --> update project
or just press ALT+ F5

python re.split() to split by spaces, commas, and periods, but not in cases like 1,000 or 1.50

Use a negative lookahead and a negative lookbehind:

> s = "one two 3.4 5,6 seven.eight nine,ten"
> parts = re.split('\s|(?<!\d)[,.](?!\d)', s)
['one', 'two', '3.4', '5,6', 'seven', 'eight', 'nine', 'ten']

In other words, you always split by \s (whitespace), and only split by commas and periods if they are not followed (?!\d) or preceded (?<!\d) by a digit.

DEMO.

EDIT: As per @verdesmarald comment, you may want to use the following instead:

> s = "one two 3.4 5,6 seven.eight nine,ten,1.2,a,5"
> print re.split('\s|(?<!\d)[,.]|[,.](?!\d)', s)
['one', 'two', '3.4', '5,6', 'seven', 'eight', 'nine', 'ten', '1.2', 'a', '5']

This will split "1.2,a,5" into ["1.2", "a", "5"].

DEMO.

Print out the values of a (Mat) matrix in OpenCV C++

If you are using opencv3, you can print Mat like python numpy style:

Mat xTrainData = (Mat_<float>(5,2) << 1, 1, 1, 1, 2, 2, 2, 2, 2, 2);

cout << "xTrainData (python)  = " << endl << format(xTrainData, Formatter::FMT_PYTHON) << endl << endl;

Output as below, you can see it'e more readable, see here for more information.

But in most case, there is no need to output all the data in Mat, you can output by row range like 0 ~ 2 row:

#include <opencv2/imgproc/imgproc.hpp>
#include <opencv2/highgui/highgui.hpp>

#include <iostream>
#include <iomanip>

using namespace cv;
using namespace std;

int main(int argc, char** argv)
{
    //row: 6, column: 3,unsigned one channel
    Mat image1(6, 3, CV_8UC1, 5);

    // output row: 0 ~ 2
    cout << "image1 row: 0~2 = "<< endl << " "  << image1.rowRange(0, 2) << endl << endl;

    //row: 8, column: 2,unsigned three channel
    Mat image2(8, 2, CV_8UC3, Scalar(1, 2, 3));

    // output row: 0 ~ 2
    cout << "image2 row: 0~2 = "<< endl << " "  << image2.rowRange(0, 2) << endl << endl;

    return 0;
}

Output as below:

Vue-router redirect on page not found (404)

I think you should be able to use a default route handler and redirect from there to a page outside the app, as detailed below:

const ROUTER_INSTANCE = new VueRouter({
    mode: "history",
    routes: [
        { path: "/", component: HomeComponent },
        // ... other routes ...
        // and finally the default route, when none of the above matches:
        { path: "*", component: PageNotFound }
    ]
})

In the above PageNotFound component definition, you can specify the actual redirect, that will take you out of the app entirely:

Vue.component("page-not-found", {
    template: "",
    created: function() {
        // Redirect outside the app using plain old javascript
        window.location.href = "/my-new-404-page.html";
    }
}

You may do it either on created hook as shown above, or mounted hook also.

Please note:

I have not verified the above. You need to build a production version of app, ensure that the above redirect happens. You cannot test this in vue-cli as it requires server side handling.
Usually in single page apps, server sends out the same index.html along with app scripts for all route requests, especially if you have set <base href="/">. This will fail for your /404-page.html unless your server treats it as a special case and serves the static page.

Let me know if it works!

Update for Vue 3 onward:

You'll need to replace the '*' path property with '/:pathMatch(.*)*' if you're using Vue 3 as the old catch-all path of '*' is no longer supported. The route would then look something like this:

{ path: '/:pathMatch(.*)*', component: PathNotFound },

See the docs for more info on this update.

Is background-color:none valid CSS?

write this:

.class {
background-color:transparent;
}

stopPropagation vs. stopImmediatePropagation

I am a late comer, but maybe I can say this with a specific example:

Say, if you have a <table>, with <tr>, and then <td>. Now, let's say you set 3 event handlers for the <td> element, then if you do event.stopPropagation() in the first event handler you set for <td>, then all event handlers for <td> will still run, but the event just won't propagate to <tr> or <table> (and won't go up and up to <body>, <html>, document, and window).

Now, however, if you use event.stopImmediatePropagation() in your first event handler, then, the other two event handlers for <td> WILL NOT run, and won't propagate up to <tr>, <table> (and won't go up and up to <body>, <html>, document, and window).

Note that it is not just for <td>. For other elements, it will follow the same principle.

How do I open a new window using jQuery?

It's not really something you need jQuery to do. There is a very simple plain old javascript method for doing this:

window.open('http://www.google.com','GoogleWindow', 'width=800, height=600');

That's it.

The first arg is the url, the second is the name of the window, this should be specified because IE will throw a fit about trying to use window.opener later if there was no window name specified (just a little FYI), and the last two params are width/height.

EDIT: Full specification can be found in the link mmmshuddup provided.

Java, How to add values to Array List used as value in HashMap

First you retreieve the value (given a key) and then you add a new element to it

    ArrayList<String> grades = examList.get(courseId);
    grades.add(aGrade);

Error:Execution failed for task ':app:transformClassesWithJarMergingForDebug'

see if their duplicate jars or dependencies your adding remove it and your error will be gone: Eg: if you add android:supportv4 jar and also dependency you will get the error so remove the jar error will be gone

How can I do an OrderBy with a dynamic string parameter?

I did so:

using System.Linq.Expressions;

namespace System.Linq
{
    public static class LinqExtensions
    {

        public static IOrderedQueryable<TSource> OrderBy<TSource>(this IQueryable<TSource> source, string field, string dir = "asc")
        {
            // parametro => expressão
            var parametro = Expression.Parameter(typeof(TSource), "r");
            var expressao = Expression.Property(parametro, field);
            var lambda = Expression.Lambda(expressao, parametro); // r => r.AlgumaCoisa
            var tipo = typeof(TSource).GetProperty(field).PropertyType;

            var nome = "OrderBy";
            if (string.Equals(dir, "desc", StringComparison.InvariantCultureIgnoreCase))
            {
                nome = "OrderByDescending";
            }
            var metodo = typeof(Queryable).GetMethods().First(m => m.Name == nome && m.GetParameters().Length == 2);
            var metodoGenerico = metodo.MakeGenericMethod(new[] { typeof(TSource), tipo });
            return metodoGenerico.Invoke(source, new object[] { source, lambda }) as IOrderedQueryable<TSource>;

        }

        public static IOrderedQueryable<TSource> ThenBy<TSource>(this IOrderedQueryable<TSource> source, string field, string dir = "asc")
        {
            var parametro = Expression.Parameter(typeof(TSource), "r");
            var expressao = Expression.Property(parametro, field);
            var lambda = Expression.Lambda<Func<TSource, string>>(expressao, parametro); // r => r.AlgumaCoisa
            var tipo = typeof(TSource).GetProperty(field).PropertyType;

            var nome = "ThenBy";
            if (string.Equals(dir, "desc", StringComparison.InvariantCultureIgnoreCase))
            {
                nome = "ThenByDescending";
            }

            var metodo = typeof(Queryable).GetMethods().First(m => m.Name == nome && m.GetParameters().Length == 2);
            var metodoGenerico = metodo.MakeGenericMethod(new[] { typeof(TSource), tipo });
            return metodoGenerico.Invoke(source, new object[] { source, lambda }) as IOrderedQueryable<TSource>;
        }

    }
}

Use :

example.OrderBy("Nome", "desc").ThenBy("other")

Work like:

example.OrderByDescending(r => r.Nome).ThenBy(r => r.other)

jQuery scroll to element

If you are not much interested in the smooth scroll effect and just interested in scrolling to a particular element, you don't require some jQuery function for this. Javascript has got your case covered:

https://developer.mozilla.org/en-US/docs/Web/API/element.scrollIntoView

So all you need to do is: $("selector").get(0).scrollIntoView();

.get(0) is used because we want to retrieve the JavaScript's DOM element and not the JQuery's DOM element.

Missing Microsoft RDLC Report Designer in Visual Studio

This trouble passed me. If you can't repair this trouble, perhaps can you review all Framework versions that you have in your system. For example, if you have ReportViewer for Framework 4.5 and your project is assembly in Framework 2 or another Framework minor at 4.5. The differents versions Framework sometime have problems.

How to find a parent with a known class in jQuery?

Pass a selector to the jQuery parents function:

d.parents('.a').attr('id')

EDIT Hmm, actually Slaks's answer is superior if you only want the closest ancestor that matches your selector.

close fancy box from function from within open 'fancybox'

I ended up using:

<script>parent.$("#fancy_close").click();</script>

I guess the version of fancybox we have doesn't have a $.fancybox.close() function for me to call :(

FYI, I just wanted the page to close the fancybox, as it had finished its processing in PHP.

Laravel 4: Redirect to a given url

You can also use redirect() method like this:-

return redirect('https://stackoverflow.com/');

How to get correlation of two vectors in python

The docs indicate that numpy.correlate is not what you are looking for:

numpy.correlate(a, v, mode='valid', old_behavior=False)[source]
  Cross-correlation of two 1-dimensional sequences.
  This function computes the correlation as generally defined in signal processing texts:
     z[k] = sum_n a[n] * conj(v[n+k])
  with a and v sequences being zero-padded where necessary and conj being the conjugate.

Instead, as the other comments suggested, you are looking for a Pearson correlation coefficient. To do this with scipy try:

from scipy.stats.stats import pearsonr   
a = [1,4,6]
b = [1,2,3]   
print pearsonr(a,b)

This gives

(0.99339926779878274, 0.073186395040328034)

You can also use numpy.corrcoef:

import numpy
print numpy.corrcoef(a,b)

This gives:

[[ 1.          0.99339927]
 [ 0.99339927  1.        ]]

Passing properties by reference in C#

I wrote a wrapper using the ExpressionTree variant and c#7 (if somebody is interested):

public class Accessor<T>
{
    private Action<T> Setter;
    private Func<T> Getter;

    public Accessor(Expression<Func<T>> expr)
    {
        var memberExpression = (MemberExpression)expr.Body;
        var instanceExpression = memberExpression.Expression;
        var parameter = Expression.Parameter(typeof(T));

        if (memberExpression.Member is PropertyInfo propertyInfo)
        {
            Setter = Expression.Lambda<Action<T>>(Expression.Call(instanceExpression, propertyInfo.GetSetMethod(), parameter), parameter).Compile();
            Getter = Expression.Lambda<Func<T>>(Expression.Call(instanceExpression, propertyInfo.GetGetMethod())).Compile();
        }
        else if (memberExpression.Member is FieldInfo fieldInfo)
        {
            Setter = Expression.Lambda<Action<T>>(Expression.Assign(memberExpression, parameter), parameter).Compile();
            Getter = Expression.Lambda<Func<T>>(Expression.Field(instanceExpression,fieldInfo)).Compile();
        }

    }

    public void Set(T value) => Setter(value);

    public T Get() => Getter();
}

And use it like:

var accessor = new Accessor<string>(() => myClient.WorkPhone);
accessor.Set("12345");
Assert.Equal(accessor.Get(), "12345");

How to check if an item is selected from an HTML drop down list?

Select select = new Select(_element);
List<WebElement> selectedOptions = select.getAllSelectedOptions();

if(selectedOptions.size() > 0){
    return true;
}else{
    return false;
}

How many bytes does one Unicode character take?

I know this question is old and already has an accepted answer, but I want to offer a few examples (hoping it'll be useful to someone).

As far as I know old ASCII characters took one byte per character.

Right. Actually, since ASCII is a 7-bit encoding, it supports 128 codes (95 of which are printable), so it only uses half a byte (if that makes any sense).

How many bytes does a Unicode character require?

Unicode just maps characters to codepoints. It doesn't define how to encode them. A text file does not contain Unicode characters, but bytes/octets that may represent Unicode characters.

I assume that one Unicode character can contain every possible character from any language - am I correct?

No. But almost. So basically yes. But still no.

So how many bytes does it need per character?

Same as your 2nd question.

And what do UTF-7, UTF-6, UTF-16 etc mean? Are they some kind Unicode versions?

No, those are encodings. They define how bytes/octets should represent Unicode characters.

A couple of examples. If some of those cannot be displayed in your browser (probably because the font doesn't support them), go to http://codepoints.net/U+1F6AA (replace 1F6AA with the codepoint in hex) to see an image.

- U+0061 LATIN SMALL LETTER A: a
  - Nº: 97
  - UTF-8: 61
  - UTF-16: 00 61
- U+00A9 COPYRIGHT SIGN: ©
  - Nº: 169
  - UTF-8: C2 A9
  - UTF-16: 00 A9
- U+00AE REGISTERED SIGN: ®
  - Nº: 174
  - UTF-8: C2 AE
  - UTF-16: 00 AE
- U+1337 ETHIOPIC SYLLABLE PHWA: ?
  - Nº: 4919
  - UTF-8: E1 8C B7
  - UTF-16: 13 37
- U+2014 EM DASH: —
  - Nº: 8212
  - UTF-8: E2 80 94
  - UTF-16: 20 14
- U+2030 PER MILLE SIGN: ‰
  - Nº: 8240
  - UTF-8: E2 80 B0
  - UTF-16: 20 30
- U+20AC EURO SIGN: €
  - Nº: 8364
  - UTF-8: E2 82 AC
  - UTF-16: 20 AC
- U+2122 TRADE MARK SIGN: ™
  - Nº: 8482
  - UTF-8: E2 84 A2
  - UTF-16: 21 22
- U+2603 SNOWMAN: ?
  - Nº: 9731
  - UTF-8: E2 98 83
  - UTF-16: 26 03
- U+260E BLACK TELEPHONE: ?
  - Nº: 9742
  - UTF-8: E2 98 8E
  - UTF-16: 26 0E
- U+2614 UMBRELLA WITH RAIN DROPS: ?
  - Nº: 9748
  - UTF-8: E2 98 94
  - UTF-16: 26 14
- U+263A WHITE SMILING FACE: ?
  - Nº: 9786
  - UTF-8: E2 98 BA
  - UTF-16: 26 3A
- U+2691 BLACK FLAG: ?
  - Nº: 9873
  - UTF-8: E2 9A 91
  - UTF-16: 26 91
- U+269B ATOM SYMBOL: ?
  - Nº: 9883
  - UTF-8: E2 9A 9B
  - UTF-16: 26 9B
- U+2708 AIRPLANE: ?
  - Nº: 9992
  - UTF-8: E2 9C 88
  - UTF-16: 27 08
- U+271E SHADOWED WHITE LATIN CROSS: ?
  - Nº: 10014
  - UTF-8: E2 9C 9E
  - UTF-16: 27 1E
- U+3020 POSTAL MARK FACE: ?
  - Nº: 12320
  - UTF-8: E3 80 A0
  - UTF-16: 30 20
- U+8089 CJK UNIFIED IDEOGRAPH-8089: ?
  - Nº: 32905
  - UTF-8: E8 82 89
  - UTF-16: 80 89
- U+1F4A9 PILE OF POO:
  - Nº: 128169
  - UTF-8: F0 9F 92 A9
  - UTF-16: D8 3D DC A9
- U+1F680 ROCKET:
  - Nº: 128640
  - UTF-8: F0 9F 9A 80
  - UTF-16: D8 3D DE 80

Okay I'm getting carried away...

Fun facts:

If you're looking for a specific character, you can copy&paste it on http://codepoints.net/.
I wasted a lot of time on this useless list (but it's sorted!).
MySQL has a charset called "utf8" which actually does not support characters longer than 3 bytes. So you can't insert a pile of poo, the field will be silently truncated. Use "utf8mb4" instead.
There's a snowman test page (unicodesnowmanforyou.com).

Open JQuery Datepicker by clicking on an image w/ no input field

The jQuery documentation says that the datePicker needs to be attached to a SPAN or a DIV when it is not associated with an input box. You could do something like this:

<img src='someimage.gif' id="datepickerImage" />
<div id="datepicker"></div>

<script type="text/javascript">
 $(document).ready(function() {
    $("#datepicker").datepicker({
            changeMonth: true,
            changeYear: true,
    })
    .hide()
    .click(function() {
      $(this).hide();
    });

    $("#datepickerImage").click(function() {
       $("#datepicker").show(); 
    });
 });
</script>

Unique Key constraints for multiple columns in Entity Framework

You need to define a composite key.

With data annotations it looks like this:

public class Entity
 {
   public string EntityId { get; set;}
   [Key]
   [Column(Order=0)]
   public int FirstColumn  { get; set;}
   [Key]
   [Column(Order=1)]
   public int SecondColumn  { get; set;}
 }

You can also do this with modelBuilder when overriding OnModelCreating by specifying:

modelBuilder.Entity<Entity>().HasKey(x => new { x.FirstColumn, x.SecondColumn });

Show tables, describe tables equivalent in redshift

You can use - desc / to see the view/table definition in Redshift. I have been using Workbench/J as a SQL client for Redshift and it gives the definition in the Messages tab adjacent to Result tab.

Callback functions in C++

The accepted answer is very useful and quite comprehensive. However, the OP states

I would like to see a simple example to write a callback function.

So here you go, from C++11 you have std::function so there is no need for function pointers and similar stuff:

#include <functional>
#include <string>
#include <iostream>

void print_hashes(std::function<int (const std::string&)> hash_calculator) {
    std::string strings_to_hash[] = {"you", "saved", "my", "day"};
    for(auto s : strings_to_hash)
        std::cout << s << ":" << hash_calculator(s) << std::endl;    
}

int main() {
    print_hashes( [](const std::string& str) {   /** lambda expression */
        int result = 0;
        for (int i = 0; i < str.length(); i++)
            result += pow(31, i) * str.at(i);
        return result;
    });
    return 0;
}

This example is by the way somehow real, because you wish to call function print_hashes with different implementations of hash functions, for this purpose I provided a simple one. It receives a string, returns an int (a hash value of the provided string), and all that you need to remember from the syntax part is std::function<int (const std::string&)> which describes such function as an input argument of the function that will invoke it.

converting list to json format - quick and easy way

For me, it worked to use Newtonsoft.Json:

using Newtonsoft.Json;
// ...
var output = JsonConvert.SerializeObject(ListOfMyObject);

How to extract a string using JavaScript Regex?

You need to use the m flag:

multiline; treat beginning and end characters (^ and $) as working over multiple lines (i.e., match the beginning or end of each line (delimited by \n or \r), not only the very beginning or end of the whole input string)

Also put the * in the right place:

"DATE:20091201T220000\r\nSUMMARY:Dad's birthday".match(/^SUMMARY\:(.*)$/gm);
//------------------------------------------------------------------^    ^
//-----------------------------------------------------------------------|

How to host google web fonts on my own server?

~~There is a tool localfont.com to help you download all font variants. It as well generates the corresponding CSS for implementation.~~ deprecated

localfont is down. Instead, as Damir suggests, you can use google-webfonts-helper

Difference between "move" and "li" in MIPS assembly language

The move instruction copies a value from one register to another. The li instruction loads a specific numeric value into that register.

For the specific case of zero, you can use either the constant zero or the zero register to get that:

move $s0, $zero
li   $s0, 0

There's no register that generates a value other than zero, though, so you'd have to use li if you wanted some other number, like:

li $s0, 12345678

Difference between SurfaceView and View?

updated 05/09/2014

OK. We have official document now. It talked all I have mentioned, in a better way.

Why do Python's math.ceil() and math.floor() operations return floats instead of integers?

This is a very interesting question! As a float requires some bits to store the exponent (=bits_for_exponent) any floating point number greater than 2**(float_size - bits_for_exponent) will always be an integral value! At the other extreme a float with a negative exponent will give one of 1, 0 or -1. This makes the discussion of integer range versus float range moot because these functions will simply return the original number whenever the number is outside the range of the integer type. The python functions are wrappers of the C function and so this is really a deficiency of the C functions where they should have returned an integer and forced the programer to do the range/NaN/Inf check before calling ceil/floor.

Thus the logical answer is the only time these functions are useful they would return a value within integer range and so the fact they return a float is a mistake and you are very smart for realizing this!

typecast string to integer - Postgres

If the value contains non-numeric characters, you can convert the value to an integer as follows:

SELECT CASE WHEN <column>~E'^\\d+$' THEN CAST (<column> AS INTEGER) ELSE 0 END FROM table;

The CASE operator checks the < column>, if it matches the integer pattern, it converts the rate into an integer, otherwise it returns 0

How to remove default chrome style for select Input?

textarea, input { outline: none; }

via https://stackoverflow.com/a/935572/1036298

How do I resolve git saying "Commit your changes or stash them before you can merge"?

You can't merge with local modifications. Git protects you from losing potentially important changes.

You have three options:

Commit the change using
```
git commit -m "My message"
```
Stash it.

Stashing acts as a stack, where you can push changes, and you pop them in reverse order.

To stash, type
```
git stash
```
Do the merge, and then pull the stash:
```
git stash pop
```
Discard the local changes

using git reset --hard
or git checkout -t -f remote/branch

Or: Discard local changes for a specific file

using git checkout filename

Split a List into smaller lists of N size

I would suggest to use this extension method to chunk the source list to the sub-lists by specified chunk size:

/// <summary>
/// Helper methods for the lists.
/// </summary>
public static class ListExtensions
{
    public static List<List<T>> ChunkBy<T>(this List<T> source, int chunkSize) 
    {
        return source
            .Select((x, i) => new { Index = i, Value = x })
            .GroupBy(x => x.Index / chunkSize)
            .Select(x => x.Select(v => v.Value).ToList())
            .ToList();
    }
}

For example, if you chunk the list of 18 items by 5 items per chunk, it gives you the list of 4 sub-lists with the following items inside: 5-5-5-3.

Java count occurrence of each item in an array

With java-8, you can do it like this:

String[] array = {"name1","name2","name3","name4", "name5", "name2"};
Arrays.stream(array)
      .collect(Collectors.groupingBy(s -> s))
      .forEach((k, v) -> System.out.println(k+" "+v.size()));

Output:

name5 1
name4 1
name3 1
name2 2
name1 1

What it does is:

Create a Stream<String> from the original array
Group each element by identity, resulting in a Map<String, List<String>>
For each key value pair, print the key and the size of the list

If you want to get a Map that contains the number of occurences for each word, it can be done doing:

Map<String, Long> map = Arrays.stream(array)
    .collect(Collectors.groupingBy(s -> s, Collectors.counting()));

For more informations:

Hope it helps! :)

How can I get enum possible values in a MySQL database?

It is extraordinary how none of you has thought that if you are using an enum field it means that the values to be assigned are known "a priori".

Therefore if the values are known "a priori" the best ways to manage them is through a very simple Enum class.

Kiss rule and save one database call.

<?php
class Genre extends \SplEnum {
 const male = "Male";
 const female = "Female";
}

http://it2.php.net/manual/en/class.splenum.php

MySQL Job failed to start

In my case the problem was the /var/log disk full (check with df -h)

Just deleted some log files and mysql started, no big deal!

Importing data from a JSON file into R

import httr package

library(httr)

Get the url

url <- "http://www.omdbapi.com/?apikey=72bc447a&t=Annie+Hall&y=&plot=short&r=json"
resp <- GET(url)

Print content of resp as text

content(resp, as = "text")

Print content of resp

content(resp)

Use content() to get the content of resp, but this time do not specify a second argument. R figures out automatically that you're dealing with a JSON, and converts the JSON to a named R list.

Today's Date in Perl in MM/DD/YYYY format

Formating numbers with leading zero is done easily with "sprintf", a built-in function in perl (documentation with: perldoc perlfunc)

use strict;
use warnings;
use Date::Calc qw();
my ($y, $m, $d) = Date::Calc::Today();
my $ddmmyyyy = sprintf '%02d.%02d.%d', $d, $m, $y;
print $ddmmyyyy . "\n";

This gives you:

14.05.2014

Command to get nth line of STDOUT

You can use awk:

ls -l | awk 'NR==2'

Update

The above code will not get what we want because of off-by-one error: the ls -l command's first line is the total line. For that, the following revised code will work:

ls -l | awk 'NR==3'

Statically rotate font-awesome icons

If you want to rotate 45 degrees, you can use the CSS transform property:

.fa-rotate-45 {
    -ms-transform:rotate(45deg);     /* Internet Explorer 9 */
    -webkit-transform:rotate(45deg); /* Chrome, Safari, Opera */
    transform:rotate(45deg);         /* Standard syntax */
}

Android TextView Text not getting wrapped

I added a \n in the middle of my string and it looked okay.

Adding a user on .htpasswd

FWIW, htpasswd -n username will output the result directly to stdout, and avoid touching files altogether.

E11000 duplicate key error index in mongodb mongoose

Change the collection name if it already exists in the database, it will show an error. And if you given any property as unique the same error will occur.

Android: making a fullscreen application

I recently had the exact same issue and benefitted from the following post as well (in addition to Rohit5k2's solution above):

https://bsgconsultancy.wordpress.com/2015/09/13/convert-any-website-into-android-application-by-using-android-studio/

In Step 3, MainActivity extends Activity instead of ActionBarActivity (as Rohit5k2 mentioned). Putting the NoTitleBar and Fullscreen theme elements into the correct places in the AndroidManifest.xml file is also very important (take a look at Step 4).

What is 'PermSize' in Java?

This blog post gives a nice explanation and some background. Basically, the "permanent generation" (whose size is given by PermSize) is used to store things that the JVM has to allocate space for, but which will not (normally) be garbage-collected (hence "permanent") (+). That means for example loaded classes and static fields.

There is also a FAQ on garbage collection directly from Sun, which answers some questions about the permanent generation. Finally, here's a blog post with a lot of technical detail.

(+) Actually parts of the permanent generation will be GCed, e.g. class objects will be removed when a class is unloaded. But that was uncommon when the permanent generation was introduced into the JVM, hence the name.

Why do I get "warning longer object length is not a multiple of shorter object length"?

I had a similar problem but it had to do with the structure and class of the object. I would check how dih_y2$MemberID is formatted.

Returning Arrays in Java

As Luiggi mentioned you need to change your main to:

import java.util.Arrays;

public class trial1{

    public static void main(String[] args){
        int[] A = numbers();
        System.out.println(Arrays.toString(A)); //Might require import of util.Arrays
    }

    public static int[] numbers(){
        int[] A = {1,2,3};
        return A;
    }
}

How to resolve git error: "Updates were rejected because the tip of your current branch is behind"

I had this issue and I realized that .gitignore file is changed. So, I changed .gitignore and I could pull the changes.

How to change time in DateTime?

Try this one

var NewDate = Convert.ToDateTime(DateTime.Now.ToString("dd/MMM/yyyy")+" "+"10:15 PM")/*Add your time here*/;

Convert Rows to columns using 'Pivot' in SQL Server

select * from (select name, ID from Empoyee) Visits
    pivot(sum(ID) for name
    in ([Emp1],
    [Emp2],
    [Emp3]
    ) ) as pivottable;

Change bullets color of an HTML list without using span

I tried this today and typed this:
I needed to display color markers in my lists (both bullets and numbers). I came upon this tip and wrote in in my stylesheet whith mutualization of the properties:

ul,
ol {
  list-style: none;
  padding: 0;
  margin: 0 0 0 15px;
}
ul {}
ol {
  counter-reset: li;
}
li {
  padding-left: 1em; 
}
ul li {}
ul li::before,
ol li::before {
  color: #91be3c;
  display: inline-block;
  width: 1em;
}
ul li::before {
  content: "\25CF";
  margin: 0 0.1em 0 -1.1em;
}
ol li {
  counter-increment: li;
}
ol li::before {
  content: counter(li);
  margin: 0 0 0 -1em;
}

I chose a different character to display a bullet, watching it here. I needed to adjust the margin accoardingly, maybe the values won't apply with the font you chose (the numbers use your webfont).

How can I display my windows user name in excel spread sheet using macros?

Range("A1").value = Environ("Username")

This is better than Application.Username, which doesn't always supply the Windows username. Thanks to Kyle for pointing this out.

Application Username is the name of the User set in Excel > Tools > Options
Environ("Username") is the name you registered for Windows; see Control Panel >System

JS strings "+" vs concat method

There was a time when adding strings into an array and finalising the string by using join was the fastest/best method. These days browsers have highly optimised string routines and it is recommended that + and += methods are fastest/best

warning about too many open figures

The following snippet solved the issue for me:


class FigureWrapper(object):
    '''Frees underlying figure when it goes out of scope. 
    '''

    def __init__(self, figure):
        self._figure = figure

    def __del__(self):
        plt.close(self._figure)
        print("Figure removed")


# .....
    f, ax = plt.subplots(1, figsize=(20, 20))
    _wrapped_figure = FigureWrapper(f)

    ax.plot(...
    plt.savefig(...
# .....

When _wrapped_figure goes out of scope the runtime calls our __del__() method with plt.close() inside. It happens even if exception fires after _wrapped_figure constructor.

How to convert R Markdown to PDF?

I think you really need pandoc, which great software was designed and built just for this task :) Besides pdf, you could convert your md file to e.g. docx or odt among others.

Well, installing an up-to-date version of Pandoc might be challanging on Linux (as you would need the entire haskell-platform?to build from the sources), but really easy on Windows/Mac with only a few megabytes of download.

If you have the brewed/knitted markdown file you can just call pandoc in e.g bash or with the system function within R. A POC demo of that latter is implemented in the ?andoc.convert function of my little package (which you must be terribly bored of as I try to point your attention there at every opportunity).

Get model's fields in Django

Another way is add functions to the model and when you want to override the date you can call the function.

class MyModel(models.Model):
    name = models.CharField(max_length=256)
    created = models.DateTimeField(auto_now_add=True)
    modified = models.DateTimeField(auto_now=True)

    def set_created_date(self, created_date):
        field = self._meta.get_field('created')
        field.auto_now_add = False
        self.created = created_date

    def set_modified_date(self, modified_date):
        field = self._meta.get_field('modified')
        field.auto_now = False
        self.modified = modified_date

my_model = MyModel(name='test')
my_model.set_modified_date(new_date)
my_model.set_created_date(new_date)
my_model.save()

Check if a given time lies between two times regardless of date

sorry for the sudo code..I'm on a phone. ;)

between = (time < string2 && time > string1);
if (string1 > string2)  between = !between;

if they are timestamps or strings this works. just change the variable names to match

pdftk compression option

I had the same issue and I used this function to compress individual pages which results in the file size being compressed by upto 1/3 of the original size.

for (int i = 1; i <= theDoc.PageCount; i++)
{
       theDoc.PageNumber = i;
       theDoc.Flatten();
}

Calculate distance between 2 GPS coordinates

Scala version

  def deg2rad(deg: Double) = deg * Math.PI / 180.0

  def rad2deg(rad: Double) = rad / Math.PI * 180.0

  def getDistanceMeters(lat1: Double, lon1: Double, lat2: Double, lon2: Double) = {
    val theta = lon1 - lon2
    val dist = Math.sin(deg2rad(lat1)) * Math.sin(deg2rad(lat2)) + Math.cos(deg2rad(lat1)) *
      Math.cos(deg2rad(lat2)) * Math.cos(deg2rad(theta))
    Math.abs(
      Math.round(
        rad2deg(Math.acos(dist)) * 60 * 1.1515 * 1.609344 * 1000)
    )
  }

How to add a Browse To File dialog to a VB.NET application

You should use the OpenFileDialog class like this

Dim fd As OpenFileDialog = New OpenFileDialog() 
Dim strFileName As String

fd.Title = "Open File Dialog"
fd.InitialDirectory = "C:\"
fd.Filter = "All files (*.*)|*.*|All files (*.*)|*.*"
fd.FilterIndex = 2
fd.RestoreDirectory = True

If fd.ShowDialog() = DialogResult.OK Then
   strFileName = fd.FileName
End If

Then you can use the File class.

Activating Anaconda Environment in VsCode

Just launch the VS Code from the Anaconda Navigator. It works for me.

byte[] to file in Java

Basic example:

String fileName = "file.test";

BufferedOutputStream bs = null;

try {

    FileOutputStream fs = new FileOutputStream(new File(fileName));
    bs = new BufferedOutputStream(fs);
    bs.write(byte_array);
    bs.close();
    bs = null;

} catch (Exception e) {
    e.printStackTrace()
}

if (bs != null) try { bs.close(); } catch (Exception e) {}

How to upload a file using Java HttpClient library working with PHP

If you are testing this on your local WAMP you might need to set up the temporary folder for file uploads. You can do this in your PHP.ini file:

upload_tmp_dir = "c:\mypath\mytempfolder\"

You will need to grant permissions on the folder to allow the upload to take place - the permission you need to grant vary based on your operating system.

Failed to load resource 404 (Not Found) - file location error?

Looks like the path you gave doesn't have any bootstrap files in them.

href="~/lib/bootstrap/dist/css/bootstrap.min.css"

Make sure the files exist over there , else point the files to the correct path, which should be in your case

href="~/node_modules/bootstrap/dist/css/bootstrap.min.css"

MVC [HttpPost/HttpGet] for Action

In Mvc 4 you can use AcceptVerbsAttribute, I think this is a very clean solution

[AcceptVerbs(WebRequestMethods.Http.Get, WebRequestMethods.Http.Post)]
public IHttpActionResult Login()
{
   // Login logic
}

Standard Android menu icons, for example refresh

Maybe a bit late. Completing the other answers, you have the hdpi refresh icon in:

"android_sdk"\platforms\"android_api_level"\data\res\drawable-hdpi\ic_menu_refresh.png

EF Code First "Invalid column name 'Discriminator'" but no inheritance

Here is the Fluent API syntax.

http://blogs.msdn.com/b/adonet/archive/2010/12/06/ef-feature-ctp5-fluent-api-samples.aspx

class Person
{
    public string FirstName { get; set; }
    public string LastName { get; set; }
    public string FullName { 
        get {
            return this.FirstName + " " + this.LastName;
        }
    }
}

class PersonViewModel : Person
{
    public bool UpdateProfile { get; set; }
}


protected override void OnModelCreating(DbModelBuilder modelBuilder)
{
    // ignore a type that is not mapped to a database table
    modelBuilder.Ignore<PersonViewModel>();

    // ignore a property that is not mapped to a database column
    modelBuilder.Entity<Person>()
        .Ignore(p => p.FullName);

}

Debug message "Resource interpreted as other but transferred with MIME type application/javascript"

Another common cause of this error on the Mac is Apple's quarantine flag.

ls the directory containing the resource(s) in question. If you see the extended attribute indicator, i.e., the little @ symbol at the end of the permissions block (e.g. -rw-r--r--@ ) then the file could be quarantined.

Try ls -la@e and look for com.apple.quarantine

The following command will remove the quarantine:

xattr -d com.apple.quarantine /path/to/file

What is a constant reference? (not a reference to a constant)

By "constant reference" I am guessing you really mean "reference to constant data". Pointers on the other hand, can be a constant pointer (the pointer itself is constant, not the data it points to), a pointer to constant data, or both.

How do I display a wordpress page content?

@Sydney Try putting wp_reset_query() before you call the loop. This will display the content of your page.

<?php
    wp_reset_query(); // necessary to reset query
    while ( have_posts() ) : the_post();
        the_content();
    endwhile; // End of the loop.
?>

EDIT: Try this if you have some other loops that you previously ran. Place wp_reset_query(); where you find it most suitable, but before you call this loop.

Materialize CSS - Select Doesn't Seem to Render

Because they override the browser default, the select styling needs Javascript to run. You need to include the Materialize Javascript file, and then call

$(document).ready(function() {
    $('select').formSelect();
    // Old way
    // $('select').material_select();
});

after you've loaded that file.

MySQL: Can't create/write to file '/tmp/#sql_3c6_0.MYI' (Errcode: 2) - What does it even mean?

A better way worked for me.

    chown root:root /tmp
  chmod 1777 /tmp
  /etc/init.d/mysqld restart

That is it.

See here :http://nixcraft.com/databases-servers/14260-error-1-hy000-cant-create-write-file-tmp-sql_9f3_0-myi-errcode-13-a.html

http://smashingweb.info/solved-mysql-tmp-error-cant-createwrite-to-file-tmpmykbo3bl-errcode-13/

How set maximum date in datepicker dialog in android?

You can create Custom date picker, that is work for all api levels.

public class CustomDatePickerDialog extends DatePickerDialog {

    int maxYear;
    int maxMonth;
    int maxDay;

    public CustomDatePickerDialog(Context context, OnDateSetListener callBack, int year, int monthOfYear, int dayOfMonth) {
        super(context, callBack, year, monthOfYear, dayOfMonth);
    }

    public void setMaxDate(long maxDate) {
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.HONEYCOMB) {
            getDatePicker().setMaxDate(System.currentTimeMillis());
        } else {
            final Calendar c = Calendar.getInstance();
            c.setTimeInMillis(maxDate);
            maxYear = c.get(Calendar.YEAR);
            maxMonth = c.get(Calendar.MONTH);
            maxDay = c.get(Calendar.DAY_OF_MONTH);
        }
    }

    @Override
    public void onDateChanged(DatePicker view, int year, int monthOfYear, int dayOfMonth) {
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.HONEYCOMB) {
            super.onDateChanged(view, year, monthOfYear, dayOfMonth);
        } else {
            if (year > maxYear)
                view.updateDate(maxYear, maxMonth, maxDay);

            if (monthOfYear > maxMonth && year == maxYear)
                view.updateDate(maxYear, maxMonth, maxDay);

            if (dayOfMonth > maxDay && year == maxYear && monthOfYear == maxMonth)
                view.updateDate(maxYear, maxMonth, maxDay);
        }
    }

set max date

final CustomDatePickerDialog pickerDialog = new CustomDatePickerDialog(getActivity(),
        myDateListener, year, month, day);
pickerDialog.setMaxDate(System.currentTimeMillis());
pickerDialog.show();

How to set "style=display:none;" using jQuery's attr method?

Based on the comment we are removing one property from style attribute.

Here this was not affect, but when more property are used within the style it helpful.

$('#msform').css('display', '')

After this we use

$("#msform").show();

Sheet.getRange(1,1,1,12) what does the numbers in bracket specify?

Found these docu on the google docu pages:

row --- int --- top row of the range
column --- int--- leftmost column of the range
optNumRows --- int --- number of rows in the range.
optNumColumns --- int --- number of columns in the range

In your example, you would get (if you picked the 3rd row) "C3:O3", cause C --> O is 12 columns

edit

Using the example on the docu:

// The code below will get the number of columns for the range C2:G8
// in the active spreadsheet, which happens to be "4"
var count = SpreadsheetApp.getActiveSheet().getRange(2, 3, 6, 4).getNumColumns(); Browser.msgBox(count);

The values between brackets:
2: the starting row = 2
3: the starting col = C
6: the number of rows = 6 so from 2 to 8
4: the number of cols = 4 so from C to G

So you come to the range: C2:G8

How to convert FormData (HTML5 object) to JSON

If the following items meet your needs, you're in luck:

You want to convert an array of arrays like [['key','value1'], ['key2','value2'] (like what FormData gives you) into a key->value object like {key1: 'value1', key2: 'value2'} and the convert it to a JSON string.
You are targeting browsers/devices with the latest ES6 interpreter or are compiling with something like babel.
You want the tiniest way to accomplish this.

Here is the code you'll need:

const data = new FormData(document.querySelector('form'));
const json = JSON.stringify(Array.from(data).reduce((o,[k,v])=>(o[k]=v,o),{}));

Hope this helps someone.

Detect Close windows event by jQuery

You can solve this problem with vanilla-Js:

Unload Basics

If you want to prompt or warn your user that they're going to close your page, you need to add code that sets .returnValue on a beforeunload event:

    window.addEventListener('beforeunload', (event) => {
      event.returnValue = `Are you sure you want to leave?`;
    });

There's two things to remember.

Most modern browsers (Chrome 51+, Safari 9.1+ etc) will ignore what you say and just present a generic message. This prevents webpage authors from writing egregious messages, e.g., "Closing this tab will make your computer EXPLODE! ".
Showing a prompt isn't guaranteed. Just like playing audio on the web, browsers can ignore your request if a user hasn't interacted with your page. As a user, imagine opening and closing a tab that you never switch to—the background tab should not be able to prompt you that it's closing.

Optionally Show

You can add a simple condition to control whether to prompt your user by checking something within the event handler. This is fairly basic good practice, and could work well if you're just trying to warn a user that they've not finished filling out a single static form. For example:

    let formChanged = false;
    myForm.addEventListener('change', () => formChanged = true);
    window.addEventListener('beforeunload', (event) => {
      if (formChanged) {
        event.returnValue = 'You have unfinished changes!';
      }
    });

But if your webpage or webapp is reasonably complex, these kinds of checks can get unwieldy. Sure, you can add more and more checks, but a good abstraction layer can help you and have other benefits—which I'll get to later. ???

Promises

So, let's build an abstraction layer around the Promise object, which represents the future result of work- like a response from a network fetch().

The traditional way folks are taught promises is to think of them as a single operation, perhaps requiring several steps- fetch from the server, update the DOM, save to a database. However, by sharing the Promise, other code can leverage it to watch when it's finished.

Pending Work

Here's an example of keeping track of pending work. By calling addToPendingWork with a Promise—for example, one returned from fetch()—we'll control whether to warn the user that they're going to unload your page.

    const pendingOps = new Set();

    window.addEventListener('beforeunload', (event) => {
      if (pendingOps.size) {
        event.returnValue = 'There is pending work. Sure you want to leave?';
      }
    });

    function addToPendingWork(promise) {
      pendingOps.add(promise);
      const cleanup = () => pendingOps.delete(promise);
      promise.then(cleanup).catch(cleanup);
    }

Now, all you need to do is call addToPendingWork(p) on a promise, maybe one returned from fetch(). This works well for network operations and such- they naturally return a Promise because you're blocked on something outside the webpage's control.

more detail can view in this url:

https://dev.to/chromiumdev/sure-you-want-to-leavebrowser-beforeunload-event-4eg5

Hope that can solve your problem.

What is more efficient? Using pow to square or just multiply it with itself?

I tested the performance difference between x*x*... vs pow(x,i) for small i using this code:

#include <cstdlib>
#include <cmath>
#include <boost/date_time/posix_time/posix_time.hpp>

inline boost::posix_time::ptime now()
{
    return boost::posix_time::microsec_clock::local_time();
}

#define TEST(num, expression) \
double test##num(double b, long loops) \
{ \
    double x = 0.0; \
\
    boost::posix_time::ptime startTime = now(); \
    for (long i=0; i<loops; ++i) \
    { \
        x += expression; \
        x += expression; \
        x += expression; \
        x += expression; \
        x += expression; \
        x += expression; \
        x += expression; \
        x += expression; \
        x += expression; \
        x += expression; \
    } \
    boost::posix_time::time_duration elapsed = now() - startTime; \
\
    std::cout << elapsed << " "; \
\
    return x; \
}

TEST(1, b)
TEST(2, b*b)
TEST(3, b*b*b)
TEST(4, b*b*b*b)
TEST(5, b*b*b*b*b)

template <int exponent>
double testpow(double base, long loops)
{
    double x = 0.0;

    boost::posix_time::ptime startTime = now();
    for (long i=0; i<loops; ++i)
    {
        x += std::pow(base, exponent);
        x += std::pow(base, exponent);
        x += std::pow(base, exponent);
        x += std::pow(base, exponent);
        x += std::pow(base, exponent);
        x += std::pow(base, exponent);
        x += std::pow(base, exponent);
        x += std::pow(base, exponent);
        x += std::pow(base, exponent);
        x += std::pow(base, exponent);
    }
    boost::posix_time::time_duration elapsed = now() - startTime;

    std::cout << elapsed << " ";

    return x;
}

int main()
{
    using std::cout;
    long loops = 100000000l;
    double x = 0.0;
    cout << "1 ";
    x += testpow<1>(rand(), loops);
    x += test1(rand(), loops);

    cout << "\n2 ";
    x += testpow<2>(rand(), loops);
    x += test2(rand(), loops);

    cout << "\n3 ";
    x += testpow<3>(rand(), loops);
    x += test3(rand(), loops);

    cout << "\n4 ";
    x += testpow<4>(rand(), loops);
    x += test4(rand(), loops);

    cout << "\n5 ";
    x += testpow<5>(rand(), loops);
    x += test5(rand(), loops);
    cout << "\n" << x << "\n";
}

Results are:

1 00:00:01.126008 00:00:01.128338 
2 00:00:01.125832 00:00:01.127227 
3 00:00:01.125563 00:00:01.126590 
4 00:00:01.126289 00:00:01.126086 
5 00:00:01.126570 00:00:01.125930 
2.45829e+54

Note that I accumulate the result of every pow calculation to make sure the compiler doesn't optimize it away.

If I use the std::pow(double, double) version, and loops = 1000000l, I get:

1 00:00:00.011339 00:00:00.011262 
2 00:00:00.011259 00:00:00.011254 
3 00:00:00.975658 00:00:00.011254 
4 00:00:00.976427 00:00:00.011254 
5 00:00:00.973029 00:00:00.011254 
2.45829e+52

This is on an Intel Core Duo running Ubuntu 9.10 64bit. Compiled using gcc 4.4.1 with -o2 optimization.

So in C, yes x*x*x will be faster than pow(x, 3), because there is no pow(double, int) overload. In C++, it will be the roughly same. (Assuming the methodology in my testing is correct.)

This is in response to the comment made by An Markm:

Even if a using namespace std directive was issued, if the second parameter to pow is an int, then the std::pow(double, int) overload from <cmath> will be called instead of ::pow(double, double) from <math.h>.

This test code confirms that behavior:

#include <iostream>

namespace foo
{

    double bar(double x, int i)
    {
        std::cout << "foo::bar\n";
        return x*i;
    }


}

double bar(double x, double y)
{
    std::cout << "::bar\n";
    return x*y;
}

using namespace foo;

int main()
{
    double a = bar(1.2, 3); // Prints "foo::bar"
    std::cout << a << "\n";
    return 0;
}

How do I remove an object from an array with JavaScript?

Well splice works:

var arr = [{id:1,name:'serdar'}];
arr.splice(0,1);
// []

Do NOT use the delete operator on Arrays. delete will not remove an entry from an Array, it will simply replace it with undefined.

var arr = [0,1,2];
delete arr[1];
// [0, undefined, 2]

But maybe you want something like this?

var removeByAttr = function(arr, attr, value){
    var i = arr.length;
    while(i--){
       if( arr[i] 
           && arr[i].hasOwnProperty(attr) 
           && (arguments.length > 2 && arr[i][attr] === value ) ){ 

           arr.splice(i,1);

       }
    }
    return arr;
}

Just an example below.

var arr = [{id:1,name:'serdar'}, {id:2,name:'alfalfa'},{id:3,name:'joe'}];
removeByAttr(arr, 'id', 1);   
// [{id:2,name:'alfalfa'}, {id:3,name:'joe'}]

removeByAttr(arr, 'name', 'joe');
// [{id:2,name:'alfalfa'}]

Write in body request with HttpClient

Extending your code (assuming that the XML you want to send is in xmlString) :

String xmlString = "</xml>";
DefaultHttpClient httpClient = new DefaultHttpClient();
HttpPost httpRequest = new HttpPost(this.url);
httpRequest.setHeader("Content-Type", "application/xml");
StringEntity xmlEntity = new StringEntity(xmlString);
httpRequest.setEntity(xmlEntity );
HttpResponse httpresponse = httpclient.execute(httppost);

Force overwrite of local file with what's in origin repo?

This worked for me:

git reset HEAD <filename>

Why does the arrow (->) operator in C exist?

Structure in C

First you need to declare your structure:

struct mystruct{
 char element_1,
 char element_2
};

Instantiate C structure

Once you declared your structure , you can instantiate a variable that has as type your structure using either:

mystruct struct_example;

or :

mystruct* struct_example;

For the first use case you can access the varaiable eleemnet using the following syntax: struct_example.element_1 = 5;

For the second use case which is having a pointer to variable of type your structure, to be able to access the variable structure you need an arrow:

struct_example->element_1 = 5;

Hashmap holding different data types as values for instance Integer, String and Object

You have some variables that are different types in Java language like that:

 message of type string
 timestamp of type time
 count of type integer
 version of type integer

If you use a HashMap like:

HashMap<String,Object> yourHash = new HashMap<String,Object>();
yourHash.put("message","message");
yourHash.put("timestamp",timestamp);
yourHash.put("count ",count);
yourHash.put("version ",version);

If you want to use the yourHash:

for(String key : yourHash.keySet()){
  String message = (String) yourHash.get(key);
  Datetime timestamp= (Datetime) yourHash.get(key);
  int timestamp= (int) yourHash.get(key);
}

Remove characters from a string

You can use replace function.

str.replace(regexp|substr, newSubstr|function)

Posting form to different MVC post action depending on the clicked submit button

you can use ajax calls to call different methods without a postback

$.ajax({
    type: "POST",
     url: "@(Url.Action("Action", "Controller"))",
     data: {id: 'id', id1: 'id1' },
     contentType: "application/json; charset=utf-8",
     cache: false,
     async: true,
     success: function (result) {
        //do something
     }
});

How to extract text from the PDF document?

Download the class.pdf2text.php @ https://pastebin.com/dvwySU1a or http://www.phpclasses.org/browse/file/31030.html (Registration required)

Code:

include('class.pdf2text.php');
$a = new PDF2Text();
$a->setFilename('filename.pdf'); 
$a->decodePDF();
echo $a->output();

class.pdf2text.php Project Home
pdf2textclass doesn't work with all the PDF's I've tested, If it doesn't work for you, try PDF Parser

ajax jquery simple get request

var settings = {
        "async": true,
        "crossDomain": true,
        "url": "<your URL Here>",
        "method": "GET",
        "headers": {
            "content-type": "application/x-www-form-urlencoded"
        },
        "data": {
            "username": "[email protected]",
            "password": "12345678"
        }
    }

    $.ajax(settings).done(function (response) {
        console.log(response);
    });

Using jQuery UI sortable with HTML tables

You can call sortable on a <tbody> instead of on the individual rows.

<table>
    <tbody>
        <tr> 
            <td>1</td>
            <td>2</td>
        </tr>
        <tr>
            <td>3</td>
            <td>4</td> 
        </tr>
        <tr>
            <td>5</td>
            <td>6</td>
        </tr>  
    </tbody>    
</table>?

<script>
    $('tbody').sortable();
</script>

_x000D_

$(function() {_x000D_
  $( "tbody" ).sortable();_x000D_
});

_x000D_

 _x000D_
table {_x000D_
    border-spacing: collapse;_x000D_
    border-spacing: 0;_x000D_
}_x000D_
td {_x000D_
    width: 50px;_x000D_
    height: 25px;_x000D_
    border: 1px solid black;_x000D_
}

_x000D_

 _x000D_
_x000D_
<link href="//code.jquery.com/ui/1.11.1/themes/smoothness/jquery-ui.css" rel="stylesheet">_x000D_
<script src="//code.jquery.com/jquery-1.11.1.js"></script>_x000D_
<script src="//code.jquery.com/ui/1.11.1/jquery-ui.js"></script>_x000D_
_x000D_
<table>_x000D_
    <tbody>_x000D_
        <tr>_x000D_
            <td>1</td>_x000D_
            <td>2</td>_x000D_
        </tr>_x000D_
        <tr>_x000D_
            <td>3</td>_x000D_
            <td>4</td>_x000D_
        </tr>_x000D_
        <tr> _x000D_
            <td>5</td>_x000D_
            <td>6</td>_x000D_
        </tr>_x000D_
        <tr>_x000D_
            <td>7</td>_x000D_
            <td>8</td>_x000D_
        </tr>_x000D_
        <tr>_x000D_
            <td>9</td> _x000D_
            <td>10</td>_x000D_
        </tr>  _x000D_
    </tbody>    _x000D_
</table>

_x000D_

CSS background image to fit height, width should auto-scale in proportion

body.bg {
    background-size: cover;
    background-repeat: no-repeat;
    min-height: 100vh;
    background: white url(../images/bg-404.jpg) center center no-repeat;
    -webkit-background-size: cover;
    -moz-background-size: cover;
    -o-background-size: cover;
}   
Try This
_x000D_
_x000D_
    body.bg {_x000D_
     background-size: cover;_x000D_
     background-repeat: no-repeat;_x000D_
     min-height: 100vh;_x000D_
     background: white url(http://lorempixel.com/output/city-q-c-1920-1080-7.jpg) center center no-repeat;_x000D_
     -webkit-background-size: cover;_x000D_
     -moz-background-size: cover;_x000D_
     -o-background-size: cover;_x000D_
    } _x000D_
    <body class="bg">_x000D_
_x000D_
_x000D_
     _x000D_
    </body>_x000D_
_x000D_
_x000D_

How to loop backwards in python?

for x in reversed(whatever):
    do_something()

This works on basically everything that has a defined order, including xrange objects and lists.

How to implement Enums in Ruby?

I think the best way to implement enumeration like types is with symbols since the pretty much behave as integer (when it comes to performace, object_id is used to make comparisons ); you don't need to worry about indexing and they look really neat in your code xD

java.io.FileNotFoundException: /storage/emulated/0/New file.txt: open failed: EACCES (Permission denied)

I suspect you are running Android 6.0 Marshmallow (API 23) or later. If this is the case, you must implement runtime permissions before you try to read/write external storage.

Write a function that returns the longest palindrome in a given string

Following code calculates Palidrom for even length and odd length strings.

Not the best solution but works for both the cases

HYTBCABADEFGHABCDEDCBAGHTFYW12345678987654321ZWETYGDE HYTBCABADEFGHABCDEDCBAGHTFYW1234567887654321ZWETYGDE

private static String getLongestPalindrome(String string) {
    String odd = getLongestPalindromeOdd(string);
    String even = getLongestPalindromeEven(string);
    return (odd.length() > even.length() ? odd : even);
}

public static String getLongestPalindromeOdd(final String input) {
    int rightIndex = 0, leftIndex = 0;
    String currentPalindrome = "", longestPalindrome = "";
    for (int centerIndex = 1; centerIndex < input.length() - 1; centerIndex++) {
        leftIndex = centerIndex;
        rightIndex = centerIndex + 1;
        while (leftIndex >= 0 && rightIndex < input.length()) {
            if (input.charAt(leftIndex) != input.charAt(rightIndex)) {
                break;
            }
            currentPalindrome = input.substring(leftIndex, rightIndex + 1);
            longestPalindrome = currentPalindrome.length() > longestPalindrome
                    .length() ? currentPalindrome : longestPalindrome;
            leftIndex--;
            rightIndex++;
        }
    }
    return longestPalindrome;
}

public static String getLongestPalindromeEven(final String input) {
    int rightIndex = 0, leftIndex = 0;
    String currentPalindrome = "", longestPalindrome = "";
    for (int centerIndex = 1; centerIndex < input.length() - 1; centerIndex++) {
        leftIndex = centerIndex - 1;
        rightIndex = centerIndex + 1;
        while (leftIndex >= 0 && rightIndex < input.length()) {
            if (input.charAt(leftIndex) != input.charAt(rightIndex)) {
                break;
            }
            currentPalindrome = input.substring(leftIndex, rightIndex + 1);
            longestPalindrome = currentPalindrome.length() > longestPalindrome
                    .length() ? currentPalindrome : longestPalindrome;
            leftIndex--;
            rightIndex++;
        }
    }
    return longestPalindrome;
}

Maven2: Missing artifact but jars are in place

M2Eclipse sometimes does that. Select Project > Clean ... from the Menu and everything will be fine after the rebuild

How to restore a SQL Server 2012 database to SQL Server 2008 R2?

Right click on your database and select Tasks -> Generate Scripts

Select things you want to restore or just let the complete database be selected by default.

Now click Next -> Click Advanced and Choose 'Script for Server Version' to the 'ssms version' you want to restore like 2008 or 2008 R2 or other.

also, select 'type of data to script' to 'Schema and Data'

Finally execute this .sql file on destination ssms and Change Database Name in first Line Use Database

if database is not there then create one and if you get error with executing the script execute the script from alter keyword to complete bottom.

Switching to landscape mode in Android Emulator

To switch to Landscape mode in android emulator u have 2 ways to accomplish.

1> You can create a relative layout such that when you switch from one mode to other it will change accordingly

2> You can create 2 separate XML file both the views and use it whenever required

Why does the html input with type "number" allow the letter 'e' to be entered in the field?

The E stands for the exponent, and it is used to shorten long numbers. Since the input is a math input and exponents are in math to shorten great numbers, so that's why there is an E.

It is displayed like this: 4e.

Links: 1 and 2

How to transition to a new view controller with code only using Swift

This worked perfectly for me:

func switchScreen() {
    let mainStoryboard = UIStoryboard(name: "Main", bundle: Bundle.main)
    if let viewController = mainStoryboard.instantiateViewController(withIdentifier: "yourVcName") as? UIViewController {
        self.present(viewController, animated: true, completion: nil)
    }
}

jQuery - replace all instances of a character in a string

You need to use a regular expression, so that you can specify the global (g) flag:

var s = 'some+multi+word+string'.replace(/\+/g, ' ');

(I removed the $() around the string, as replace is not a jQuery method, so that won't work at all.)

Why is there no SortedList in Java?

List iterators guarantee first and foremost that you get the list's elements in the internal order of the list (aka. insertion order). More specifically it is in the order you've inserted the elements or on how you've manipulated the list. Sorting can be seen as a manipulation of the data structure, and there are several ways to sort the list.

I'll order the ways in the order of usefulness as I personally see it:

1. Consider using `Set` or `Bag` collections instead

NOTE: I put this option at the top because this is what you normally want to do anyway.

A sorted set automatically sorts the collection at insertion, meaning that it does the sorting while you add elements into the collection. It also means you don't need to manually sort it.

Furthermore if you are sure that you don't need to worry about (or have) duplicate elements then you can use the TreeSet<T> instead. It implements SortedSet and NavigableSet interfaces and works as you'd probably expect from a list:

TreeSet<String> set = new TreeSet<String>();
set.add("lol");
set.add("cat");
// automatically sorts natural order when adding

for (String s : set) {
    System.out.println(s);
}
// Prints out "cat" and "lol"

If you don't want the natural ordering you can use the constructor parameter that takes a Comparator<T>.

Alternatively, you can use Multisets (also known as Bags), that is a Set that allows duplicate elements, instead and there are third-party implementations of them. Most notably from the Guava libraries there is a TreeMultiset, that works a lot like the TreeSet.

2. Sort your list with `Collections.sort()`

As mentioned above, sorting of Lists is a manipulation of the data structure. So for situations where you need "one source of truth" that will be sorted in a variety of ways then sorting it manually is the way to go.

You can sort your list with the java.util.Collections.sort() method. Here is a code sample on how:

List<String> strings = new ArrayList<String>()
strings.add("lol");
strings.add("cat");

Collections.sort(strings);
for (String s : strings) {
    System.out.println(s);
}
// Prints out "cat" and "lol"

Using comparators

One clear benefit is that you may use Comparator in the sort method. Java also provides some implementations for the Comparator such as the Collator which is useful for locale sensitive sorting strings. Here is one example:

Collator usCollator = Collator.getInstance(Locale.US);
usCollator.setStrength(Collator.PRIMARY); // ignores casing

Collections.sort(strings, usCollator);

Sorting in concurrent environments

Do note though that using the sort method is not friendly in concurrent environments, since the collection instance will be manipulated, and you should consider using immutable collections instead. This is something Guava provides in the Ordering class and is a simple one-liner:

List<string> sorted = Ordering.natural().sortedCopy(strings);

3. Wrap your list with `java.util.PriorityQueue`

Though there is no sorted list in Java there is however a sorted queue which would probably work just as well for you. It is the java.util.PriorityQueue class.

Nico Haase linked in the comments to a related question that also answers this.

In a sorted collection you most likely don't want to manipulate the internal data structure which is why PriorityQueue doesn't implement the List interface (because that would give you direct access to its elements).

Caveat on the `PriorityQueue` iterator

The PriorityQueue class implements the Iterable<E> and Collection<E> interfaces so it can be iterated as usual. However, the iterator is not guaranteed to return elements in the sorted order. Instead (as Alderath points out in the comments) you need to poll() the queue until empty.

Note that you can convert a list to a priority queue via the constructor that takes any collection:

List<String> strings = new ArrayList<String>()
strings.add("lol");
strings.add("cat");

PriorityQueue<String> sortedStrings = new PriorityQueue(strings);
while(!sortedStrings.isEmpty()) {
    System.out.println(sortedStrings.poll());
}
// Prints out "cat" and "lol"

4. Write your own `SortedList` class

NOTE: You shouldn't have to do this.

You can write your own List class that sorts each time you add a new element. This can get rather computation heavy depending on your implementation and is pointless, unless you want to do it as an exercise, because of two main reasons:

It breaks the contract that List<E> interface has because the add methods should ensure that the element will reside in the index that the user specifies.
Why reinvent the wheel? You should be using the TreeSet or Multisets instead as pointed out in the first point above.

However, if you want to do it as an exercise here is a code sample to get you started, it uses the AbstractList abstract class:

public class SortedList<E> extends AbstractList<E> {

    private ArrayList<E> internalList = new ArrayList<E>();

    // Note that add(E e) in AbstractList is calling this one
    @Override 
    public void add(int position, E e) {
        internalList.add(e);
        Collections.sort(internalList, null);
    }

    @Override
    public E get(int i) {
        return internalList.get(i);
    }

    @Override
    public int size() {
        return internalList.size();
    }

}

Note that if you haven't overridden the methods you need, then the default implementations from AbstractList will throw UnsupportedOperationExceptions.

Unable to execute dex: Multiple dex files define Lcom/myapp/R$array;

This error occurred to me when I imported a .jar file (as a matter of fact it was httpmime-4.3.jar) and tried to use it. For me the solution was easy: I removed the .jar file from the libs folder and deleted it from Order and Export. Ran the project again, it worked, so I added the .jar file again and it was finally okay.

Good Free Alternative To MS Access

The issue is finding an alternative to MS Access that includes a visual, drag and drop development environment with a "reasonable" database where the whole kit and caboodle can be deployed free of charge.

My first suggestion would be to look at this very complete list of MS Access alternatives (many of which are free), followed by a gander at this list of open source database development tools on osalt.com.

My second suggestion would be to check out WaveMaker, which is sort of an open source PowerBuilder for the cloud (disclaimer: I work there so should not be considered to be an unbiased source of information ;-)

WaveMaker combines a drag and drop IDE with an open source Java back end. It is licensed under the Apache license and boasts a 15,000-strong developer community.

Multiple files upload (Array) with CodeIgniter 2.0

function imageUpload(){
            if ($this->input->post('submitImg') && !empty($_FILES['files']['name'])) {
                $filesCount = count($_FILES['files']['name']);
                $userID = $this->session->userdata('userID');
                $this->load->library('upload');

                $config['upload_path'] = './userdp/';
                $config['allowed_types'] = 'jpg|png|jpeg';
                $config['max_size'] = '9184928';
                $config['max_width']  = '5000';
                $config['max_height']  = '5000';

                $files = $_FILES;
                $cpt = count($_FILES['files']['name']);

                for($i = 0 ; $i < $cpt ; $i++){
                    $_FILES['files']['name']= $files['files']['name'][$i];
                    $_FILES['files']['type']= $files['files']['type'][$i];
                    $_FILES['files']['tmp_name']= $files['files']['tmp_name'][$i];
                    $_FILES['files']['error']= $files['files']['error'][$i];
                    $_FILES['files']['size']= $files['files']['size'][$i];    

                    $imageName = 'image_'.$userID.'_'.rand().'.png';

                    $config['file_name'] = $imageName;

                    $this->upload->initialize($config);
                    if($this->upload->do_upload('files')){
                        $fileData = $this->upload->data(); //it return
                        $uploadData[$i]['picturePath'] = $fileData['file_name'];
                    }
                }

                if (!empty($uploadData)) {
                    $imgInsert = $this->insert_model->insertImg($uploadData);
                    $statusMsg = $imgInsert?'Files uploaded successfully.':'Some problem occurred, please try again.';
                    $this->session->set_flashdata('statusMsg',$statusMsg);
                    redirect('home/user_dash');
                }
            }
            else{
                redirect('home/user_dash');
            }
        }

HTML colspan in CSS

I came here because currently the WordPress table block doesn't support the colspan parameter and i thought i will replace it using CSS. This was my solution, assuming that the columns are the same width:

_x000D_

table {_x000D_
  width: 100%;_x000D_
}_x000D_
_x000D_
table td {_x000D_
  width: 50%;_x000D_
  background: #dbdbdb;_x000D_
  text-align: center;_x000D_
}_x000D_
_x000D_
table tr:nth-child(2n+1) {_x000D_
  position:relative;_x000D_
  display:block;_x000D_
  height:20px;_x000D_
  background:green;_x000D_
}_x000D_
_x000D_
table tr:nth-child(2n+1) td {_x000D_
  position:absolute;_x000D_
  left:0;_x000D_
  right:-100%;_x000D_
  width: auto;_x000D_
  top:0;_x000D_
  bottom:0;_x000D_
  background:red;_x000D_
  text-align:center;_x000D_
}

_x000D_

<table>_x000D_
    <tr>_x000D_
        <td>row</td>_x000D_
    </tr>_x000D_
    <tr>_x000D_
        <td>cell</td>_x000D_
        <td>cell</td>_x000D_
    </tr>_x000D_
    <tr>_x000D_
        <td>row</td>_x000D_
    </tr>_x000D_
    <tr>_x000D_
        <td>cell</td>_x000D_
        <td>cell</td>_x000D_
    </tr>_x000D_
</table>

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'pip install' fails for every package ("Could not find a version that satisfies the requirement")

Upgrade pip as follows:

curl https://bootstrap.pypa.io/get-pip.py | python

Note: You may need to use sudo python above if not in a virtual environment.

What's happening:

Python.org sites are stopping support for TLS versions 1.0 and 1.1. This means that Mac OS X version 10.12 (Sierra) or older will not be able to use pip unless they upgrade pip as above.

(Note that upgrading pip via pip install --upgrade pip will also not upgrade it correctly. It is a chicken-and-egg issue)

This thread explains it (thanks to this Twitter post):

Mac users who use pip and PyPI:

If you are running macOS/OS X version 10.12 or older, then you ought to upgrade to the latest pip (9.0.3) to connect to the Python Package Index securely:
curl https://bootstrap.pypa.io/get-pip.py | python
and we recommend you do that by April 8th.

Pip 9.0.3 supports TLSv1.2 when running under system Python on macOS < 10.13. Official release notes: https://pip.pypa.io/en/stable/news/

Also, the Python status page:

Completed - The rolling brownouts are finished, and TLSv1.0 and TLSv1.1 have been disabled. Apr 11, 15:37 UTC

Update - The rolling brownouts have been upgraded to a blackout, TLSv1.0 and TLSv1.1 will be rejected with a HTTP 403 at all times. Apr 8, 15:49 UTC

Lastly, to avoid other install errors, make sure you also upgrade setuptools after doing the above:

pip install --upgrade setuptools

Bring a window to the front in WPF

Well I figured out a work around. I'm making the call from a keyboard hook used to implement a hotkey. The call works as expected if I put it into a BackgroundWorker with a pause. It's a kludge, but I have no idea why it wasn't working originally.

void hotkey_execute()
{
    IntPtr handle = new WindowInteropHelper(Application.Current.MainWindow).Handle;
    BackgroundWorker bg = new BackgroundWorker();
    bg.DoWork += new DoWorkEventHandler(delegate
        {
            Thread.Sleep(10);
            SwitchToThisWindow(handle, true);
        });
    bg.RunWorkerAsync();
}

How to change DatePicker dialog color for Android 5.0

Kotlin, 2021

// set date as button text if pressed
btnDate.setOnClickListener(View.OnClickListener {

    val dpd = DatePickerDialog(
        this,
        { view, year, monthOfYear, dayOfMonth ->
            val selectDate = Calendar.getInstance()
            selectDate.set(Calendar.YEAR, year)
            selectDate.set(Calendar.MONTH, monthOfYear)
            selectDate.set(Calendar.DAY_OF_MONTH, dayOfMonth)

            var formatDate = SimpleDateFormat("dd/MM/yyyy", Locale.getDefault())
            val date = formatDate.format(selectDate.time)
            Toast.makeText(this, date, Toast.LENGTH_SHORT).show()
            btnDate.text = date
        }, 1990, 6, 6
    )

    val calendar = Calendar.getInstance()
    val year = calendar[Calendar.YEAR]
    val month = calendar[Calendar.MONTH]
    val day = calendar[Calendar.DAY_OF_MONTH]
    dpd.datePicker.minDate = GregorianCalendar(year - 90, month, day, 0, 0).timeInMillis
    dpd.datePicker.maxDate = GregorianCalendar(year - 10, month, day, 0, 0).timeInMillis
    dpd.show()
})

Styles.xml

<style name="AppTheme" parent="Theme.AppCompat.Light.NoActionBar">
    <!-- This is main Theme Style for your application! -->
    <item name="android:datePickerDialogTheme">@style/MyDatePickerDialogTheme</item>
</style>

<style name="MyDatePickerDialogTheme" parent="android:Theme.Material.Dialog">
    <item name="android:datePickerStyle">@style/MyDatePickerStyle</item>
</style>

<style name="MyDatePickerStyle" parent="@android:style/Widget.Material.DatePicker">
    <item name="android:headerBackground">#A500FF</item>
</style>

Count number of rows matching a criteria

to get the number of observations the number of rows from your Dataset would be more valid:

nrow(dat[dat$sCode == "CA",])

Using AngularJS date filter with UTC date

How to make Bootstrap carousel slider use mobile left/right swipe

For anyone finding this, swipe on carousel appears to be native as of about 5 days ago (20 Oct 2018) as per
https://github.com/twbs/bootstrap/pull/25776

https://deploy-preview-25776--twbs-bootstrap4.netlify.com/docs/4.1/components/carousel/

Embedding SVG into ReactJS

There is a package that converts it for you and returns the svg as a string to implement into your reactJS file.

https://www.npmjs.com/package/convert-svg-react

Extract hostname name from string

If you end up on this page and you are looking for the best REGEX of URLS try this one:

^(?:https?:)?(?:\/\/)?([^\/\?]+)

https://regex101.com/r/pX5dL9/1

It works for urls without http:// , with http, with https, with just // and dont grab the path and query path as well.

Good Luck

python modify item in list, save back in list

A common idiom to change every element of a list looks like this:

for i in range(len(L)):
    item = L[i]
    # ... compute some result based on item ...
    L[i] = result

This can be rewritten using enumerate() as:

for i, item in enumerate(L):
    # ... compute some result based on item ...
    L[i] = result

See enumerate.

How can I get the file name from request.FILES?

request.FILES['filename'].name

From the request documentation.

If you don't know the key, you can iterate over the files:

for filename, file in request.FILES.iteritems():
    name = request.FILES[filename].name

Check if null Boolean is true results in exception

Boolean is the object wrapper class for the primitive boolean. This class, as any class, can indeed be null. For performance and memory reasons it is always best to use the primitive.

The wrapper classes in the Java API serve two primary purposes:

To provide a mechanism to “wrap” primitive values in an object so that the primitives can be included in activities reserved for objects, like as being added to Collections, or returned from a method with an object return value.
To provide an assortment of utility functions for primitives. Most of these functions are related to various conversions: converting primitives to and from String objects, and converting primitives and String objects to and from different bases (or radix), such as binary, octal, and hexadecimal.

http://en.wikipedia.org/wiki/Primitive_wrapper_class

Format Date/Time in XAML in Silverlight

You can use StringFormat in Silverlight 4 to provide a custom formatting of the value you bind to.

Dates

The date formatting has a huge range of options.

For the DateTime of “April 17, 2004, 1:52:45 PM”

You can either use a set of standard formats (standard formats)…

StringFormat=f : “Saturday, April 17, 2004 1:52 PM”
StringFormat=g : “4/17/2004 1:52 PM”
StringFormat=m : “April 17”
StringFormat=y : “April, 2004”
StringFormat=t : “1:52 PM”
StringFormat=u : “2004-04-17 13:52:45Z”
StringFormat=o : “2004-04-17T13:52:45.0000000”

… or you can create your own date formatting using letters (custom formats)

StringFormat=’MM/dd/yy’ : “04/17/04”
StringFormat=’MMMM dd, yyyy g’ : “April 17, 2004 A.D.”
StringFormat=’hh:mm:ss.fff tt’ : “01:52:45.000 PM”

Position absolute but relative to parent

#father {
   position: relative;
}

#son1 {
   position: absolute;
   top: 0;
}

#son2 {
   position: absolute;
   bottom: 0;
}

This works because position: absolute means something like "use top, right, bottom, left to position yourself in relation to the nearest ancestor who has position: absolute or position: relative."

So we make #father have position: relative, and the children have position: absolute, then use top and bottom to position the children.

Detecting input change in jQuery?

This covers every change to an input using jQuery 1.7 and above:

$(".inputElement").on("input", null, null, callbackFunction);

adb remount permission denied, but able to access super user in shell -- android

Some newer builds require the following additional adb commands to be run first

adb root
adb disable-verity
adb reboot

Then

adb root
adb remount

How to use numpy.genfromtxt when first column is string and the remaining columns are numbers?

You can use numpy.recfromcsv(filename): the types of each column will be automatically determined (as if you use np.genfromtxt() with dtype=None), and by default delimiter=",". It's basically a shortcut for np.genfromtxt(filename, delimiter=",", dtype=None) that Pierre GM pointed at in his answer.

Latex Multiple Linebreaks

While verbatim might be the best choice, you can also try the commands \smallskip , \medskip or guess what, \bigskip .

Quoting from this page:

These commands can only be used after a paragraph break (which is made by one completely blank line or by the command \par). These commands output flexible or rubber space, approximately 3pt, 6pt, and 12pt high respectively, but these commands will automatically compress or expand a bit, depending on the demands of the rest of the page

Initialize static variables in C++ class?

Optionally, move all your constants to .cpp file without declaration in .h file. Use anonymous namespace to make them invisible beyond the cpp module.

// MyClass.cpp

#include "MyClass.h"

// anonymous namespace
namespace
{
    string RE_ANY = "([^\\n]*)";
    string RE_ANY_RELUCTANT = "([^\\n]*?)";
}

// member function (static or not)
bool MyClass::foo()
{
    // logic that uses constants
    return RE_ANY_RELUCTANT.size() > 0;
}

c++ array - expression must have a constant value

The standard requires the array length to be a value that is computable at compile time so that the compiler is able to allocate enough space on the stack. In your case, you are trying to set the array length to a value that is unknown at compile time. Yes, i know that it seems obvious that it should be known to the compiler, but this is not the case here. The compiler cannot make any assumptions about the contents of non-constant variables. So go with:

const int row = 8;
const int col= 8;
int a[row][col];

UPD: some compilers will actually allow you to pull this off. IIRC, g++ has this feature. However, never use it because your code will become un-portable across compilers.

C++: Where to initialize variables in constructor

See Should my constructors use "initialization lists" or "assignment"?

Briefly: in your specific case, it does not change anything. But:

for class/struct members with constructors, it may be more efficient to use option 1.
only option 1 allows you to initialize reference members.
only option 1 allows you to initialize const members
only option 1 allows you to initialize base classes using their constructor
only option 2 allows you to initialize array or structs that do not have a constructor.

My guess for why option 2 is more common is that option 1 is not well-known, neither are its advantages. Option 2's syntax feels more natural to the new C++ programmer.

Using Default Arguments in a Function

Pass an array to the function, instead of individual parameters and use null coalescing operator (PHP 7+).

Below, I'm passing an array with 2 items. Inside the function, I'm checking if value for item1 is set, if not assigned default vault.

$args = ['item2' => 'item2',
        'item3' => 'value3'];

    function function_name ($args) {
        isset($args['item1']) ? $args['item1'] : 'default value';
    }

Error : ORA-01704: string literal too long

To solve this issue on my side, I had to use a combo of what was already proposed there

DECLARE
  chunk1 CLOB; chunk2 CLOB; chunk3 CLOB;
BEGIN
  chunk1 := 'very long literal part 1';
  chunk2 := 'very long literal part 2';
  chunk3 := 'very long literal part 3';

  INSERT INTO table (MY_CLOB)
  SELECT ( chunk1 || chunk2 || chunk3 ) FROM dual;
END;

Hope this helps.

Simple GUI Java calculator

This is the working code...

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import java.util.*;

public class JavaCalculator extends JFrame {

    private JButton jbtNum1;
    private JButton jbtNum2;
    private JButton jbtNum3;
    private JButton jbtNum4;
    private JButton jbtNum5;
    private JButton jbtNum6;
    private JButton jbtNum7;
    private JButton jbtNum8;
    private JButton jbtNum9;
    private JButton jbtNum0;
    private JButton jbtEqual;
    private JButton jbtAdd;
    private JButton jbtSubtract;
    private JButton jbtMultiply;
    private JButton jbtDivide;
    private JButton jbtSolve;
    private JButton jbtClear;
    private double TEMP;
    private double SolveTEMP;
    private JTextField jtfResult;

    Boolean addBool = false;
    Boolean subBool = false;
    Boolean divBool = false;
    Boolean mulBool = false;

    String display = "";

    public JavaCalculator() {

        JPanel p1 = new JPanel();
        p1.setLayout(new GridLayout(4, 3));
        p1.add(jbtNum1 = new JButton("1"));
        p1.add(jbtNum2 = new JButton("2"));
        p1.add(jbtNum3 = new JButton("3"));
        p1.add(jbtNum4 = new JButton("4"));
        p1.add(jbtNum5 = new JButton("5"));
        p1.add(jbtNum6 = new JButton("6"));
        p1.add(jbtNum7 = new JButton("7"));
        p1.add(jbtNum8 = new JButton("8"));
        p1.add(jbtNum9 = new JButton("9"));
        p1.add(jbtNum0 = new JButton("0"));
        p1.add(jbtClear = new JButton("C"));

        JPanel p2 = new JPanel();
        p2.setLayout(new FlowLayout());
        p2.add(jtfResult = new JTextField(20));
        jtfResult.setHorizontalAlignment(JTextField.RIGHT);
        jtfResult.setEditable(false);

        JPanel p3 = new JPanel();
        p3.setLayout(new GridLayout(5, 1));
        p3.add(jbtAdd = new JButton("+"));
        p3.add(jbtSubtract = new JButton("-"));
        p3.add(jbtMultiply = new JButton("*"));
        p3.add(jbtDivide = new JButton("/"));
        p3.add(jbtSolve = new JButton("="));

        JPanel p = new JPanel();
        p.setLayout(new GridLayout());
        p.add(p2, BorderLayout.NORTH);
        p.add(p1, BorderLayout.SOUTH);
        p.add(p3, BorderLayout.EAST);

        add(p);

        jbtNum1.addActionListener(new ListenToOne());
        jbtNum2.addActionListener(new ListenToTwo());
        jbtNum3.addActionListener(new ListenToThree());
        jbtNum4.addActionListener(new ListenToFour());
        jbtNum5.addActionListener(new ListenToFive());
        jbtNum6.addActionListener(new ListenToSix());
        jbtNum7.addActionListener(new ListenToSeven());
        jbtNum8.addActionListener(new ListenToEight());
        jbtNum9.addActionListener(new ListenToNine());
        jbtNum0.addActionListener(new ListenToZero());

        jbtAdd.addActionListener(new ListenToAdd());
        jbtSubtract.addActionListener(new ListenToSubtract());
        jbtMultiply.addActionListener(new ListenToMultiply());
        jbtDivide.addActionListener(new ListenToDivide());
        jbtSolve.addActionListener(new ListenToSolve());
        jbtClear.addActionListener(new ListenToClear());
    } //JavaCaluclator()

    class ListenToClear implements ActionListener {
        public void actionPerformed(ActionEvent e) {
            //display = jtfResult.getText();
            jtfResult.setText("");
            addBool = false;
            subBool = false;
            mulBool = false;
            divBool = false;

            TEMP = 0;
            SolveTEMP = 0;
        }
    }

    class ListenToOne implements ActionListener {
        public void actionPerformed(ActionEvent e) {
            display = jtfResult.getText();
            jtfResult.setText(display + "1");
        }
    }

    class ListenToTwo implements ActionListener {
        public void actionPerformed(ActionEvent e) {
            display = jtfResult.getText();
            jtfResult.setText(display + "2");
        }
    }

    class ListenToThree implements ActionListener {
        public void actionPerformed(ActionEvent e) {
            display = jtfResult.getText();
            jtfResult.setText(display + "3");
        }
    }

    class ListenToFour implements ActionListener {
        public void actionPerformed(ActionEvent e) {
            display = jtfResult.getText();
            jtfResult.setText(display + "4");
        }
    }

    class ListenToFive implements ActionListener {
        public void actionPerformed(ActionEvent e) {
            display = jtfResult.getText();
            jtfResult.setText(display + "5");
        }
    }

    class ListenToSix implements ActionListener {
        public void actionPerformed(ActionEvent e) {
            display = jtfResult.getText();
            jtfResult.setText(display + "6");
        }
    }

    class ListenToSeven implements ActionListener {
        public void actionPerformed(ActionEvent e) {
            display = jtfResult.getText();
            jtfResult.setText(display + "7");
        }
    }

    class ListenToEight implements ActionListener {
        public void actionPerformed(ActionEvent e) {
            display = jtfResult.getText();
            jtfResult.setText(display + "8");
        }
    }

    class ListenToNine implements ActionListener {
        public void actionPerformed(ActionEvent e) {
            display = jtfResult.getText();
            jtfResult.setText(display + "9");
        }
    }

    class ListenToZero implements ActionListener {
        public void actionPerformed(ActionEvent e) {
            display = jtfResult.getText();
            jtfResult.setText(display + "0");
        }
    }

    class ListenToAdd implements ActionListener {
        public void actionPerformed(ActionEvent e) {
            TEMP = Double.parseDouble(jtfResult.getText());
            jtfResult.setText("");
            addBool = true;
        }
    }

    class ListenToSubtract implements ActionListener {
        public void actionPerformed(ActionEvent e) {
            TEMP = Double.parseDouble(jtfResult.getText());
            jtfResult.setText("");
            subBool = true;
        }
    }

    class ListenToMultiply implements ActionListener {
        public void actionPerformed(ActionEvent e) {
            TEMP = Double.parseDouble(jtfResult.getText());
            jtfResult.setText("");
            mulBool = true;
        }
    }

    class ListenToDivide implements ActionListener {
        public void actionPerformed(ActionEvent e) {
            TEMP = Double.parseDouble(jtfResult.getText());
            jtfResult.setText("");
            divBool = true;
        }
    }

    class ListenToSolve implements ActionListener {
        public void actionPerformed(ActionEvent e) {
            SolveTEMP = Double.parseDouble(jtfResult.getText());
            if (addBool == true)
                SolveTEMP = SolveTEMP + TEMP;
            else if ( subBool == true)
                SolveTEMP = SolveTEMP - TEMP;
            else if ( mulBool == true)
                SolveTEMP = SolveTEMP * TEMP;
            else if ( divBool == true)
                            SolveTEMP = SolveTEMP / TEMP;
            jtfResult.setText(  Double.toString(SolveTEMP));

            addBool = false;
            subBool = false;
            mulBool = false;
            divBool = false;
        }
    }

    public static void main(String[] args) {
        // TODO Auto-generated method stub
        JavaCalculator calc = new JavaCalculator();
        calc.pack();
        calc.setLocationRelativeTo(null);
                calc.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        calc.setVisible(true);
    }

} //JavaCalculator

I want to get the type of a variable at runtime

If by the type of a variable you mean the runtime class of the object that the variable points to, then you can get this through the class reference that all objects have.

val name = "sam";
name: java.lang.String = sam
name.getClass
res0: java.lang.Class[_] = class java.lang.String

If you however mean the type that the variable was declared as, then you cannot get that. Eg, if you say

val name: Object = "sam"

then you will still get a String back from the above code.

Postgresql Select rows where column = array

For dynamic SQL use:

'IN(' ||array_to_string(some_array, ',')||')'

Example

DO LANGUAGE PLPGSQL $$

DECLARE
    some_array bigint[];
    sql_statement text;

BEGIN

    SELECT array[1, 2] INTO some_array;
    RAISE NOTICE '%', some_array;

    sql_statement := 'SELECT * FROM my_table WHERE my_column IN(' ||array_to_string(some_array, ',')||')';
    RAISE NOTICE '%', sql_statement;

END;

$$;

Result: NOTICE: {1,2} NOTICE: SELECT * FROM my_table WHERE my_column IN(1,2)

INNER JOIN in UPDATE sql for DB2

Just to update only the rows that match the conditions, and avoid updating nulls in the other rows:

update table_one set field_1 = 'ACTIVE' where exists 
(select 1 from table_two where table_one.customer = table_two.customer);

It works in a DB2/AIX64 9.7.8

How can I print the contents of a hash in Perl?

Looping:

foreach(keys %my_hash) { print "$_ / $my_hash{$_}\n"; }

Functional

map {print "$_ / $my_hash{$_}\n"; } keys %my_hash;

But for sheer elegance, I'd have to choose wrang-wrang's. For my own code, I'd choose my foreach. Or tetro's Dumper use.

Regex doesn't work in String.matches()

[a-z] matches a single char between a and z. So, if your string was just "d", for example, then it would have matched and been printed out.

You need to change your regex to [a-z]+ to match one or more chars.

How do I populate a JComboBox with an ArrayList?

Elegant way to fill combo box with an array list :

List<String> ls = new ArrayList<String>(); 
jComboBox.setModel(new DefaultComboBoxModel<String>(ls.toArray(new String[0])));

Constructor overload in TypeScript

Regarding constructor overloads one good alternative would be to implement the additional overloads as static factory methods. I think its more readable and simple than checking for all possible argument combinations at the constructor. Here is a simple example:

function calculateAge(birthday): number {
  return new Date().getFullYear() - birthday;
}

class Person {
  static fromData(data: PersonData): Person {
    const { first, last, birthday, gender = 'M' } = data;
    return new this(
      `${last}, ${first}`,
      calculateAge(birthday),
      gender,
    );
  }

  constructor(
    public fullName: string,
    public age: number,
    public gender: 'M' | 'F',
  ) {}

  toString(): string {
    return `Hello, my name is ${this.fullName} and I'm a ${this.age}yo ${this.gender}`;
  }
}

interface PersonData {
  first: string;
  last: string;
  birthday: string;
  gender?: 'M' | 'F';
}


const personA = new Person('Doe, John', 31, 'M');
console.log(personA.toString());
const personB = Person.fromData({
  first: 'Jane',
  last: 'Smith',
  birthday: '1986',
  gender: 'F',
});
console.log(personB.toString());

Method overloading in TypeScript isn't for real, let's say, as it would require too much compiler-generated code and the core team try to avoid that at all costs. Currently the main reason for method overloading to be present on the language is to provide a way to write declarations for libraries with magic arguments in their API. Since you'll need to do all the heavy-lifting by yourself to handle different sets of arguments I don't see much advantage in using overloads instead of separated methods.

How to grep Git commit diffs or contents for a certain word?

If you want to find all commits where commit message contains given word, use

$ git log --grep=word

If you want to find all commits where "word" was added or removed in the file contents (to be more exact: where number of occurences of "word" changed), i.e. search the commit contents, use so called 'pickaxe' search with

$ git log -Sword

In modern git there is also

$ git log -Gword

to look for differences whose added or removed line matches "word" (also commit contents).

Note that -G by default accepts a regex, while -S accepts a string, but can be modified to accept regexes using the --pickaxe-regex.

To illustrate the difference between -S<regex> --pickaxe-regex and -G<regex>, consider a commit with the following diff in the same file:
+    return !regexec(regexp, two->ptr, 1, &regmatch, 0);
...
-    hit = !regexec(regexp, mf2.ptr, 1, &regmatch, 0);
While git log -G"regexec\(regexp" will show this commit, git log -S"regexec\(regexp" --pickaxe-regex will not (because the number of occurrences of that string did not change).

With Git 2.25.1 (Feb. 2020), the documentation is clarified around those regexes.

See commit 9299f84 (06 Feb 2020) by Martin Ågren (``).
^{(Merged by Junio C Hamano -- gitster -- in commit 0d11410, 12 Feb 2020)}

diff-options.txt: avoid "regex" overload in example

^{Reported-by: Adam Dinwoodie}
^{Signed-off-by: Martin Ågren}
^{Reviewed-by: Taylor Blau}

When we exemplify the difference between -G and -S (using --pickaxe-regex), we do so using an example diff and git diff invocation involving "regexec", "regexp", "regmatch", ...

The example is correct, but we can make it easier to untangle by avoiding writing "regex.*" unless it's really needed to make our point.

Use some made-up, non-regexy words instead.

The git diff documentation now includes:

To illustrate the difference between -S<regex> --pickaxe-regex and -G<regex>, consider a commit with the following diff in the same file:
+    return frotz(nitfol, two->ptr, 1, 0);
...
-    hit = frotz(nitfol, mf2.ptr, 1, 0);
While git log -G"frotz\(nitfol" will show this commit, git log -S"frotz\(nitfol" --pickaxe-regex will not (because the number of occurrences of that string did not change).

Create timestamp variable in bash script

Use command substitution:

timestamp=$( date +%T )

How to fix JSP compiler warning: one JAR was scanned for TLDs yet contained no TLDs?

Uncomment this line (in /conf/logging.properties)

org.apache.jasper.compiler.TldLocationsCache.level = FINE

Work's for me in tomcat 7.0.53!

jQuery UI Dialog window loaded within AJAX style jQuery UI Tabs

curious - why doesn't the 'nothing easier than this' answer (above) not work? it looks logical? http://206.251.38.181/jquery-learn/ajax/iframe.html

C# how to use enum with switch

Two things. First, you need to qualify the enum reference in your test - rather than "PLUS", it should be "Operator.PLUS". Second, this code would be a lot more readable if you used the enum member names rather than their integral values in the switch statement. I've updated your code:

public enum Operator
{
    PLUS, MINUS, MULTIPLY, DIVIDE
}

public static double Calculate(int left, int right, Operator op)
{
    switch (op)
    {
        default:
        case Operator.PLUS:
            return left + right;

        case Operator.MINUS:
            return left - right;

        case Operator.MULTIPLY:
            return left * right;

        case Operator.DIVIDE:
            return left / right;
    }
}

Call this with:

Console.WriteLine("The sum of 5 and 5 is " + Calculate(5, 5, Operator.PLUS));

css to make bootstrap navbar transparent

CSS code:

.header .navbar-default {
  background: none;
}

HTML code:

<header>
    <nav class="navbar navbar-default"></nav>
</header>

How to count number of files in each directory?

A super fast miracle command, which recursively traverses files to count the number of images in a directory and organize the output by image extension:

find . -type f | sed -e 's/.*\.//' | sort | uniq -c | sort -n | grep -Ei '(tiff|bmp|jpeg|jpg|png|gif)$'

Credits: https://unix.stackexchange.com/a/386135/354980

SQL SERVER: Check if variable is null and then assign statement for Where Clause

is null can be used to check whether null data is coming from a query as in following example:

 declare @Mem varchar(20),@flag int
select @mem=MemberClub from [dbo].[UserMaster] where UserID=@uid
if(@Mem is null)
begin
    set @flag= 0;
end
else
begin
    set @flag=1;
end
return @flag;

How to set thymeleaf th:field value from other variable

You could approach this method.

Instead of using th:field use html id & name. Set value using th:value

<input class="form-control"
           type="text"
           th:value="${client.name}" id="clientName" name="clientName" />

Hope this will help you

Format numbers in django templates

Be aware that changing locale is process-wide and not thread safe (iow., can have side effects or can affect other code executed within the same process).

My proposition: check out the Babel package. Some means of integrating with Django templates are available.

How can I force Python's file.write() to use the same newline format in Windows as in Linux ("\r\n" vs. "\n")?

You can still use the textmode and force the linefeed-newline with the keyword argument newline

f = open("./foo",'w',newline='\n')

Tested with Python 3.4.2.

Edit: This does not work in Python 2.7.

Is there an easy way to strike through text in an app widget?

For Lollipop and above. create a drawable

<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
    <item android:state_pressed="false">
        <shape android:shape="line">
            <stroke android:width="1dp"
                android:color="@color/onePlusRed" />
        </shape>
    </item>
</selector>

and use it as foreground.
android:foreground="@drawable/strike_through"

Check if a String contains a special character

All depends on exactly what you mean by "special". In a regex you can specify

\W to mean non-alpahnumeric
\p{Punct} to mean punctuation characters

I suspect that the latter is what you mean. But if not use a [] list to specify exactly what you want.

reading HttpwebResponse json response, C#

If you're getting source in Content Use the following method

try
{
    var response = restClient.Execute<List<EmpModel>>(restRequest);

    var jsonContent = response.Content;

    var data = JsonConvert.DeserializeObject<List<EmpModel>>(jsonContent);

    foreach (EmpModel item in data)
    {
        listPassingData?.Add(item);
    }
}
catch (Exception ex)
{
    Console.WriteLine($"Data get mathod problem {ex} ");
}

Android sqlite how to check if a record exists

because of possible data leaks best solution via cursor:

 Cursor cursor = null;
    try {
          cursor =  .... some query (raw or not your choice)
          return cursor.moveToNext();
    } finally {
        if (cursor != null) {
            cursor.close();
        }
    }

1) From API KITKAT u can use resources try()

try (cursor = ...some query)

2) if u query against VARCHAR TYPE use '...' eg. COLUMN_NAME='string_to_search'

3) dont use moveToFirst() is used when you need to start iterating from beggining

4) avoid getCount() is expensive - it iterates over many records to count them. It doesn't return a stored variable. There may be some caching on a second call, but the first call doesn't know the answer until it is counted.

How to get current available GPUs in tensorflow?

The accepted answer gives you the number of GPUs but it also allocates all the memory on those GPUs. You can avoid this by creating a session with fixed lower memory before calling device_lib.list_local_devices() which may be unwanted for some applications.

I ended up using nvidia-smi to get the number of GPUs without allocating any memory on them.

import subprocess

n = str(subprocess.check_output(["nvidia-smi", "-L"])).count('UUID')

how to draw a rectangle in HTML or CSS?

Use <div id="rectangle" style="width:number px; height:number px; background-color:blue"></div>

This will create a blue rectangle.

How can I keep my branch up to date with master with git?

You can use the cherry-pick to get the particular bug fix commit(s)

$ git checkout branch
$ git cherry-pick bugfix

Fatal error: Maximum execution time of 300 seconds exceeded

Xampp Users

Go to xampp\phpMyAdmin\
Open config.inc.php
Search for $cfg['ExecTimeLimit'] = 300;
Set a larger value or change to 0 for unlimited
If not found add $cfg['ExecTimeLimit'] = 0; (or a larger value)
Save the file and restart the server

How to add data via $.ajax ( serialize() + extra data ) like this

What kind of data?

data: $('#myForm').serialize() + "&moredata=" + morevalue

The "data" parameter is just a URL encoded string. You can append to it however you like. See the API here.

google map API zoom range

Available Zoom Levels

Zoom level 0 is the most zoomed out zoom level available and each integer step in zoom level halves the X and Y extents of the view and doubles the linear resolution.

Google Maps was built on a 256x256 pixel tile system where zoom level 0 was a 256x256 pixel image of the whole earth. A 256x256 tile for zoom level 1 enlarges a 128x128 pixel region from zoom level 0.

As correctly stated by bkaid, the available zoom range depends on where you are looking and the kind of map you are using:

Road maps - seem to go up to zoom level 22 everywhere
Hybrid and satellite maps - the max available zoom levels depend on location. Here are some examples:
Remote regions of Antarctica: 13
Gobi Desert: 17
Much of the U.S. and Europe: 21
"Deep zoom" locations: 22-23 (see bkaid's link)

Note that these values are for the Google Static Maps API which seems to give one more zoom level than the Javascript API. It appears that the extra zoom level available for Static Maps is just an upsampled version of the max-resolution image from the Javascript API.

Map Scale at Various Zoom Levels

Google Maps uses a Mercator projection so the scale varies substantially with latitude. A formula for calculating the correct scale based on latitude is:

meters_per_pixel = 156543.03392 * Math.cos(latLng.lat() * Math.PI / 180) / Math.pow(2, zoom)

Formula is from Chris Broadfoot's comment.

Google Maps basics

Zoom Level - zoom

0 - 19

0 lowest zoom (whole world)

19 highest zoom (individual buildings, if available) Retrieve current zoom level using mapObject.getZoom()

What you're looking for are the scales for each zoom level. Use these:

20 : 1128.497220
19 : 2256.994440
18 : 4513.988880
17 : 9027.977761
16 : 18055.955520
15 : 36111.911040
14 : 72223.822090
13 : 144447.644200
12 : 288895.288400
11 : 577790.576700
10 : 1155581.153000
9  : 2311162.307000
8  : 4622324.614000
7  : 9244649.227000
6  : 18489298.450000
5  : 36978596.910000
4  : 73957193.820000
3  : 147914387.600000
2  : 295828775.300000
1  : 591657550.500000

How can I conditionally require form inputs with AngularJS?

For Angular2

<input type='email' 
    [(ngModel)]='contact.email'
    [required]='!contact.phone' >

How does the "position: sticky;" property work?

I believe this article say a lot about how sticky works

How CSS Position Sticky Really Works! CSS position sticky has two main parts, sticky item & sticky container.

Sticky Item — is the element that we defined with the position: sticky styles. The element will float when the viewport position matches the position definition, for example: top: 0px .

Sticky Container —is the HTML element which wraps the sticky item. This is the maximum area that the sticky item can float in.

When you define an element with position: sticky you’re automatically defining the parent element as a sticky container!

How to convert a normal Git repository to a bare one?

Your method looks like it would work; the file structure of a bare repository is just what is inside the .git directory. But I don't know if any of the files are actually changed, so if that fails, you can just do

git clone --bare /path/to/repo

You'll probably need to do it in a different directory to avoid a name conflict, and then you can just move it back to where you want. And you may need to change the config file to point to wherever your origin repo is.

Why can't Python parse this JSON data?

Your data is not valid JSON format. You have [] when you should have {}:

[] are for JSON arrays, which are called list in Python
{} are for JSON objects, which are called dict in Python

Here's how your JSON file should look:

{
    "maps": [
        {
            "id": "blabla",
            "iscategorical": "0"
        },
        {
            "id": "blabla",
            "iscategorical": "0"
        }
    ],
    "masks": {
        "id": "valore"
    },
    "om_points": "value",
    "parameters": {
        "id": "valore"
    }
}

Then you can use your code:

import json
from pprint import pprint

with open('data.json') as f:
    data = json.load(f)

pprint(data)

With data, you can now also find values like so:

data["maps"][0]["id"]
data["masks"]["id"]
data["om_points"]

Try those out and see if it starts to make sense.

Hibernate SessionFactory vs. JPA EntityManagerFactory

I want to add on this that you can also get Hibernate's session by calling getDelegate() method from EntityManager.

ex:

Session session = (Session) entityManager.getDelegate();

React Native absolute positioning horizontal centre

create a full-width View with alignItems: "center" then insert desired children inside.

import React from "react";
import {View} from "react-native";

export default class AbsoluteComponent extends React.Component {
  render(){
    return(
     <View style={{position: "absolute", left: 0, right: 0, alignItems: "center"}}>
      {this.props.children}
     </View>    
    )
  }
}

you can add properties like bottom: 30 for bottom aligned component.

Facebook API - How do I get a Facebook user's profile image through the Facebook API (without requiring the user to "Allow" the application)

@NaturalBornCamper,

Nice code! Here is a clean-cut code function for such process!

function get_raw_facebook_avatar_url($uid)
{
    $array = get_headers('https://graph.facebook.com/'.$uid.'/picture?type=large', 1);
    return (isset($array['Location']) ? $array['Location'] : FALSE);
}

This will return the raw Facebook avatar image URL. Feel free to do whatever you want with it then!

Check if a key is down?

I know this is very old question, however there is a very lightweight (~.5Kb) JavaScript library that effectively "patches" the inconsistent firing of keyboard event handlers when using the DOM API.

The library is Keydrown.

Here's the operative code sample that has worked well for my purposes by just changing the key on which to set the listener:

kd.P.down(function () {
  console.log('The "P" key is being held down!');
});

kd.P.up(function () {
  console.clear();
});

// This update loop is the heartbeat of Keydrown
kd.run(function () {
  kd.tick();
});

I've incorporated Keydrown into my client-side JavaScript for a proper pause animation in a Red Light Green Light game I'm writing. You can view the entire game here. (Note: If you're reading this in the future, the game should be code complete and playable :-D!)

I hope this helps.

Auto-indent in Notepad++

In the latest version (at least), you can find it through:

Settings (menu)
Preferences...
MISC (tab)
lower-left checkbox list
"Auto-indent" is the 2nd option in this group

[EDIT] Though, I don't think it's had the best implementation of Auto-indent. So, check to make sure you have version 5.1 -- auto-indent got an overhaul recently, so it auto-corrects your indenting.

Do also note that you're missing the block for the 2nd if:

void main(){
  if(){
    if() { }  # here
  }
}

Unlocking tables if thread is lost

Here's what i do to FORCE UNLOCK FOR some locked tables in MySQL

1) Enter MySQL

mysql -u your_user -p

2) Let's see the list of locked tables

mysql> show open tables where in_use>0;

3) Let's see the list of the current processes, one of them is locking your table(s)

mysql> show processlist;

4) Let's kill one of these processes

mysql> kill put_process_id_here;

"getaddrinfo failed", what does that mean?

The problem, in my case, was that some install at some point defined an environment variable http_proxy on my machine when I had no proxy.

Removing the http_proxy environment variable fixed the problem.

Ruby 'require' error: cannot load such file

What about including the current directory in the search path?

ruby -I. main.rb

Programs & Examples On #Listserv

Xcode Simulator: how to remove older unneeded devices?

Java Web Service client basic authentication

Defining private module functions in python

load scripts asynchronously

Get a worksheet name using Excel VBA

PermissionError: [WinError 5] Access is denied python using moviepy to write gif

How to check if a text field is empty or not in swift

How to get the last element of a slice?

jQuery get textarea text

How can I enable auto complete support in Notepad++?

Oracle 10g: Extract data (select) from XML (CLOB Type)

How to get the range of occupied cells in excel sheet

Bootstrap throws Uncaught Error: Bootstrap's JavaScript requires jQuery

How to recursively download a folder via FTP on Linux

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

Putting GridView data in a DataTable

How to use random in BATCH script?

How to customise file type to syntax associations in Sublime Text?

Which versions of SSL/TLS does System.Net.WebRequest support?

How to set Android camera orientation properly?

Converting strings to floats in a DataFrame

Change the image source on rollover using jQuery

How to get Latitude and Longitude of the mobile device in android?

Update 2020: Using Kotlin Coroutine to get Lat, lang & Address of the Device

How do I get the time of day in javascript/Node.js?

How can I make content appear beneath a fixed DIV element?

AttributeError: 'module' object has no attribute 'urlopen'

How to know if .keyup() is a character key (jQuery)

Git Bash is extremely slow on Windows 7 x64

Determine the size of an InputStream

gcc: undefined reference to

libstdc++-6.dll not found

MySQL case sensitive query

Reading text files using read.table

Running shell command and capturing the output

Code coverage with Mocha

Maven error :Perhaps you are running on a JRE rather than a JDK?

python re.split() to split by spaces, commas, and periods, but not in cases like 1,000 or 1.50

Print out the values of a (Mat) matrix in OpenCV C++

Vue-router redirect on page not found (404)

Is background-color:none valid CSS?

stopPropagation vs. stopImmediatePropagation

How do I open a new window using jQuery?

Java, How to add values to Array List used as value in HashMap

Error:Execution failed for task ':app:transformClassesWithJarMergingForDebug'

How can I do an OrderBy with a dynamic string parameter?

jQuery scroll to element

Missing Microsoft RDLC Report Designer in Visual Studio

How to find a parent with a known class in jQuery?

close fancy box from function from within open 'fancybox'

Laravel 4: Redirect to a given url

How to get correlation of two vectors in python

Passing properties by reference in C#

How to check if an item is selected from an HTML drop down list?

How many bytes does one Unicode character take?

Open JQuery Datepicker by clicking on an image w/ no input field

Unique Key constraints for multiple columns in Entity Framework

Show tables, describe tables equivalent in redshift

Callback functions in C++

converting list to json format - quick and easy way

How to extract a string using JavaScript Regex?

How to host google web fonts on my own server?

Difference between "move" and "li" in MIPS assembly language

Difference between SurfaceView and View?

Why do Python's math.ceil() and math.floor() operations return floats instead of integers?

typecast string to integer - Postgres

How to remove default chrome style for select Input?

How do I resolve git saying "Commit your changes or stash them before you can merge"?

Commit the change using

Stash it.

Discard the local changes

Or: Discard local changes for a specific file

Split a List into smaller lists of N size

Java count occurrence of each item in an array

How can I get enum possible values in a MySQL database?

MySQL Job failed to start

Importing data from a JSON file into R

import httr package

Get the url