Programs & Examples On #Self extracting

A self-extracting archive is an archive that doesn't require any special application to extract its contents.

How do I make a self extract and running installer

Okay I have got it working, hope this information is useful.

  1. First of all I now realize that not only do self-extracting zip start extracting with doubleclick, but they require no extraction application to be installed on the users computer because the extractor code is in the archive itself. This means that you will get a different user experience depending on what you application you use to create the sfx

  2. I went with WinRar as follows, this does not require you to create an sfx file, everything can be created via the gui:

    • Select files, right click and select Add to Archive
    • Use Browse.. to create the archive in the folder above
    • Change Archive Format to Zip
    • Enable Create SFX archive
    • Select Advanced tab
    • Select SFX Options
    • Select Setup tab
    • Enter setup.exe into the Run after Extraction field
    • Select Modes tab
    • Enable Unpack to temporary folder
    • Select text and Icon tab
    • Enter a more appropriate title for your task
    • Select OK
    • Select OK

The resultant exe unzips to a temporary folder and then starts the installer

How do I download a file from the internet to my linux server with Bash

You can use the command wget to download from command line. Specifically, you could use

wget http://download.oracle.com/otn-pub/java/jdk/7u10-b18/jdk-7u10-linux-x64.tar.gz

However because Oracle requires you to accept a license agreement this may not work (and I am currently unable to test it).

How to sleep the thread in node.js without affecting other threads?

When working with async functions or observables provided by 3rd party libraries, for example Cloud firestore, I've found functions the waitFor method shown below (TypeScript, but you get the idea...) to be helpful when you need to wait on some process to complete, but you don't want to have to embed callbacks within callbacks within callbacks nor risk an infinite loop.

This method is sort of similar to a while (!condition) sleep loop, but yields asynchronously and performs a test on the completion condition at regular intervals till true or timeout.

export const sleep = (ms: number) => {
    return new Promise(resolve => setTimeout(resolve, ms))
}
/**
 * Wait until the condition tested in a function returns true, or until 
 * a timeout is exceeded.
 * @param interval The frenequency with which the boolean function contained in condition is called.
 * @param timeout  The maximum time to allow for booleanFunction to return true
 * @param booleanFunction:  A completion function to evaluate after each interval. waitFor will return true as soon as the completion function returns true.   
 */
export const waitFor = async function (interval: number, timeout: number,
    booleanFunction: Function): Promise<boolean> {
    let elapsed = 1;
    if (booleanFunction()) return true;
    while (elapsed < timeout) {
        elapsed += interval;
        await sleep(interval);
        if (booleanFunction()) {
            return true;
        }
    }
    return false;
}

The say you have a long running process on your backend you want to complete before some other task is undertaken. For example if you have a function that totals a list of accounts, but you want to refresh the accounts from the backend before you calculate, you can do something like this:

async recalcAccountTotals() : number {
     this.accountService.refresh();   //start the async process.
     if (this.accounts.dirty) {
           let updateResult = await waitFor(100,2000,()=> {return !(this.accounts.dirty)})
     }
 if(!updateResult) { 
      console.error("Account refresh timed out, recalc aborted");
      return NaN;
    }
 return ... //calculate the account total. 
}

Convert string to variable name in python

You can use a Dictionary to keep track of the keys and values.

For instance...

dictOfStuff = {} ##Make a Dictionary

x = "Buffalo" ##OR it can equal the input of something, up to you.

dictOfStuff[x] = 4 ##Get the dict spot that has the same key ("name") as what X is equal to. In this case "Buffalo". and set it to 4. Or you can set it to  what ever you like

print(dictOfStuff[x]) ##print out the value of the spot in the dict that same key ("name") as the dictionary.

A dictionary is very similar to a real life dictionary. You have a word and you have a definition. You can look up the word and get the definition. So in this case, you have the word "Buffalo" and it's definition is 4. It can work with any other word and definition. Just make sure you put them into the dictionary first.

How to change the status bar color in Android?

i used this code to change status bar to transparent

    activity?.window?.setFlags(
        WindowManager.LayoutParams.FLAG_LAYOUT_NO_LIMITS,
        WindowManager.LayoutParams.FLAG_LAYOUT_NO_LIMITS
    )

to change it to color in style used this code i used in fragment in onDetach()

activity?.window?.clearFlags(WindowManager.LayoutParams.FLAG_LAYOUT_NO_LIMITS)

Understanding lambda in python and using it to pass multiple arguments

Why do you need to state both 'x' and 'y' before the ':'?

You could actually in some situations(when you have only one argument) do not put the x and y before ":".

>>> flist = []
>>> for i in range(3):
...     flist.append(lambda : i)

but the i in the lambda will be bound by name, so,

>>> flist[0]()
2
>>> flist[2]()
2
>>>

different from what you may want.

How do I add a linker or compile flag in a CMake file?

You can also add linker flags to a specific target using the LINK_FLAGS property:

set_property(TARGET ${target} APPEND_STRING PROPERTY LINK_FLAGS " ${flag}")

If you want to propagate this change to other targets, you can create a dummy target to link to.

How can I assign an ID to a view programmatically?

Android id overview

An Android id is an integer commonly used to identify views; this id can be assigned via XML (when possible) and via code (programmatically.) The id is most useful for getting references for XML-defined Views generated by an Inflater (such as by using setContentView.)

Assign id via XML

  • Add an attribute of android:id="@+id/somename" to your view.
  • When your application is built, the android:id will be assigned a unique int for use in code.
  • Reference your android:id's int value in code using "R.id.somename" (effectively a constant.)
  • this int can change from build to build so never copy an id from gen/package.name/R.java, just use "R.id.somename".
  • (Also, an id assigned to a Preference in XML is not used when the Preference generates its View.)

Assign id via code (programmatically)

  • Manually set ids using someView.setId(int);
  • The int must be positive, but is otherwise arbitrary- it can be whatever you want (keep reading if this is frightful.)
  • For example, if creating and numbering several views representing items, you could use their item number.

Uniqueness of ids

  • XML-assigned ids will be unique.
  • Code-assigned ids do not have to be unique
  • Code-assigned ids can (theoretically) conflict with XML-assigned ids.
  • These conflicting ids won't matter if queried correctly (keep reading).

When (and why) conflicting ids don't matter

  • findViewById(int) will iterate depth-first recursively through the view hierarchy from the View you specify and return the first View it finds with a matching id.
  • As long as there are no code-assigned ids assigned before an XML-defined id in the hierarchy, findViewById(R.id.somename) will always return the XML-defined View so id'd.

Dynamically Creating Views and Assigning IDs

  • In layout XML, define an empty ViewGroup with id.
  • Such as a LinearLayout with android:id="@+id/placeholder".
  • Use code to populate the placeholder ViewGroup with Views.
  • If you need or want, assign any ids that are convenient to each view.
  • Query these child views using placeholder.findViewById(convenientInt);

  • API 17 introduced View.generateViewId() which allows you to generate a unique ID.

If you choose to keep references to your views around, be sure to instantiate them with getApplicationContext() and be sure to set each reference to null in onDestroy. Apparently leaking the Activity (hanging onto it after is is destroyed) is wasteful.. :)

Reserve an XML android:id for use in code

API 17 introduced View.generateViewId() which generates a unique ID. (Thanks to take-chances-make-changes for pointing this out.)*

If your ViewGroup cannot be defined via XML (or you don't want it to be) you can reserve the id via XML to ensure it remains unique:

Here, values/ids.xml defines a custom id:

<?xml version="1.0" encoding="utf-8"?>
<resources>
    <item name="reservedNamedId" type="id"/>
</resources>

Then once the ViewGroup or View has been created, you can attach the custom id

myViewGroup.setId(R.id.reservedNamedId);

Conflicting id example

For clarity by way of obfuscating example, lets examine what happens when there is an id conflict behind the scenes.

layout/mylayout.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical" >
    <LinearLayout
        android:id="@+id/placeholder"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:orientation="horizontal" >
</LinearLayout>

To simulate a conflict, lets say our latest build assigned R.id.placeholder(@+id/placeholder) an int value of 12..

Next, MyActivity.java defines some adds views programmatically (via code):

int placeholderId = R.id.placeholder; // placeholderId==12
// returns *placeholder* which has id==12:
ViewGroup placeholder = (ViewGroup)this.findViewById(placeholderId);
for (int i=0; i<20; i++){
    TextView tv = new TextView(this.getApplicationContext());
    // One new TextView will also be assigned an id==12:
    tv.setId(i);
    placeholder.addView(tv);
}

So placeholder and one of our new TextViews both have an id of 12! But this isn't really a problem if we query placeholder's child views:

// Will return a generated TextView:
 placeholder.findViewById(12);

// Whereas this will return the ViewGroup *placeholder*;
// as long as its R.id remains 12: 
Activity.this.findViewById(12);

*Not so bad

Calculating Pearson correlation and significance in Python

An alternative can be a native scipy function from linregress which calculates:

slope : slope of the regression line

intercept : intercept of the regression line

r-value : correlation coefficient

p-value : two-sided p-value for a hypothesis test whose null hypothesis is that the slope is zero

stderr : Standard error of the estimate

And here is an example:

a = [15, 12, 8, 8, 7, 7, 7, 6, 5, 3]
b = [10, 25, 17, 11, 13, 17, 20, 13, 9, 15]
from scipy.stats import linregress
linregress(a, b)

will return you:

LinregressResult(slope=0.20833333333333337, intercept=13.375, rvalue=0.14499815458068521, pvalue=0.68940144811669501, stderr=0.50261704627083648)

How to run Selenium WebDriver test cases in Chrome

Download the EXE file of chromedriver and extract it in the current project location.

Here is the link, where we can download the latest version of chromedriver:

https://sites.google.com/a/chromium.org/chromedriver/

Here is the simple code for the launch browser and navigate to a URL.

System.setProperty("webdriver.chrome.driver", "path of chromedriver.exe");

WebDriver driver = new ChromeDriver();

driver.get("https://any_url.com");

How to export collection to CSV in MongoDB?

I could not get mongoexport to do this for me. I found that,to get an exhaustive list of all the fields, you need to loop through the entire collection once. Use this to generate the headers. Then loop through the collection again to populate these headers for each document.

I've written a script to do just this. Converting MongoDB docs to csv irrespective of schema differences between individual documents.

https://github.com/surya-shodan/mongoexportcsv

Best way to load module/class from lib folder in Rails 3?

In my case I was trying to simply load a file directly under the lib dir.

Within application.rb...

require '/lib/this_file.rb' 

wasn't working, even in console and then when I tried

require './lib/this_file.rb' 

and rails loads the file perfectly.

I'm still pretty noob and I'm not sure why this works but it works. If someone would like to explain it to me I'd appreciate it :D I hope this helps someone either way.

ActiveRecord OR query

in Rails 3, it should be

Model.where("column = ? or other_column = ?", value, other_value)

This also includes raw sql but I dont think there is a way in ActiveRecord to do OR operation. Your question is not a noob question.

How can I disable the Maven Javadoc plugin from the command line?

It seems, that the simple way

-Dmaven.javadoc.skip=true

does not work with the release-plugin. in this case you have to pass the parameter as an "argument"

mvn release:perform -Darguments="-Dmaven.javadoc.skip=true"

Update ViewPager dynamically?

I know am late for the Party. I've fixed the problem by calling TabLayout#setupWithViewPager(myViewPager); just after FragmentPagerAdapter#notifyDataSetChanged();

Print in Landscape format

you cannot set this in javascript, you have to do this with html/css:

<style type="text/css" media="print">
  @page { size: landscape; }
</style>

EDIT: See this Question and the accepted answer for more information on browser support: Is @Page { size:landscape} obsolete?

Calling a function on bootstrap modal open

will not work.. use $(window) instead

For Showing

$(window).on('shown.bs.modal', function() { 
    $('#code').modal('show');
    alert('shown');
});

For Hiding

$(window).on('hidden.bs.modal', function() { 
    $('#code').modal('hide');
    alert('hidden');
});

npm global path prefix

Simple solution is ...

Just put below command :

  1. sudo npm config get prefix

    if it's not something like these /usr/local, than you need to fix it using below command.

  2. sudo npm config set prefix /usr/local...

Now it's 100% working fine

How to call a method in MainActivity from another class?

But an error occurred which says java.lang.NullPointerException.

Thats because, you never initialized your MainActivity. you should initialize your object before you call its methods.

MainActivity mActivity = new MainActivity();//make sure that you pass the appropriate arguments if you have an args constructor
mActivity.startChronometer();

Forcing to download a file using PHP

If you are doing it with your application itself... I hope this code helps.

HTML

In href -- you have to add download_file.php along with your URL:

<a class="download" href="'/download_file.php?fileSource='+http://www.google.com/logo_small.png" target="_blank" title="YourTitle">

PHP

/* Here is the Download.php file to force download stuff */

<?php
    $fullPath = $_GET['fileSource'];
    if($fullPath) {
        $fsize = filesize($fullPath);
        $path_parts = pathinfo($fullPath);
        $ext = strtolower($path_parts["extension"]);

        switch ($ext) {
            case "pdf":
                header("Content-Disposition: attachment; filename=\"" . $path_parts["basename"]."\""); // Use 'attachment' to force a download
                header("Content-type: application/pdf"); // Add here more headers for diff. extensions
                break;

            default;
                header("Content-type: application/octet-stream");
                header("Content-Disposition: filename=\"" . $path_parts["basename"]."\"");
        }

        if($fsize) { // Checking if file size exist
            header("Content-length: $fsize");
        }
        readfile($fullPath);
        exit;
    }
?>

I can't install python-ldap

On OSX, you need the xcode CLI tools. Just open a terminal and run:

xcode-select --install

Setting a spinner onClickListener() in Android

Whenever you have to perform some action on the click of the Spinner in Android, use the following method.

mspUserState.setOnTouchListener(new OnTouchListener() {

    @Override
    public boolean onTouch(View v, MotionEvent event) {
        if (event.getAction() == MotionEvent.ACTION_UP) {
            doWhatIsRequired();
        }
        return false;
    }
});

One thing to keep in mind is always to return False while using the above method. If you will return True then the dropdown items of the spinner will not be displayed on clicking the Spinner.

Pure CSS scroll animation

Use anchor links and the scroll-behavior property (MDN reference) for the scrolling container:

scroll-behavior: smooth;

Browser support: Firefox 36+, Chrome 61+ (therefore also Edge 79+) and Opera 48+.

Intenet Explorer, non-Chromium Edge and (so far) Safari do not support scroll-behavior and simply "jump" to the link target.

Example usage:

<head>
  <style type="text/css">
    html {
      scroll-behavior: smooth;
    }
  </style>
</head>
<body id="body">
  <a href="#foo">Go to foo!</a>

  <!-- Some content -->

  <div id="foo">That's foo.</div>
  <a href="#body">Back to top</a>
</body>

Here's a Fiddle.

And here's also a Fiddle with both horizontal and vertical scrolling.

Eclipse java debugging: source not found

I've had a related issue in connection with Glassfish server debugging in Eclipse. This was brought about by loading the source code from a different repository (changing from SVN to GitHub). In the process, the wrong compiled classes were used by the Glassfish server and hence, the source and run time would be out of sync with break points appearing on empty lines.

To solve this, rename or delete the top folder of the classes directory and Glassfish will recreate the whole class directory tree including updating the class files with the correctly compiled version.

The classes directory is located in: /workspace/glassfish3122eclipsedefaultdomain/eclipseApps/< your Web Application>/WEB-INF/classes

How do you split and unsplit a window/view in Eclipse IDE?

This is possible with the menu items Window>Editor>Toggle Split Editor.

Current shortcut for splitting is:

Azerty keyboard:

  • Ctrl + _ for split horizontally, and
  • Ctrl + { for split vertically.

Qwerty US keyboard:

  • Ctrl + Shift + - (accessing _) for split horizontally, and
  • Ctrl + Shift + [ (accessing {) for split vertically.

MacOS - Qwerty US keyboard:

  • + Shift + - (accessing _) for split horizontally, and
  • + Shift + [ (accessing {) for split vertically.

On any other keyboard if a required key is unavailable (like { on a german Qwertz keyboard), the following generic approach may work:

  • Alt + ASCII code + Ctrl then release Alt

Example: ASCII for '{' = 123, so press 'Alt', '1', '2', '3', 'Ctrl' and release 'Alt', effectively typing '{' while 'Ctrl' is pressed, to split vertically.

Example of vertical split:

https://bugs.eclipse.org/bugs/attachment.cgi?id=238285

PS:

  • The menu items Window>Editor>Toggle Split Editor were added with Eclipse Luna 4.4 M4, as mentioned by Lars Vogel in "Split editor implemented in Eclipse M4 Luna"
  • The split editor is one of the oldest and most upvoted Eclipse bug! Bug 8009
  • The split editor functionality has been developed in Bug 378298, and will be available as of Eclipse Luna M4. The Note & Newsworthy of Eclipse Luna M4 will contain the announcement.

Getting Textarea Value with jQuery

you have id="#message"... should be id="message"

http://jsfiddle.net/q5EXG/1/

How to assign bean's property an Enum value in Spring config file?

Use the value child element instead of the value attribute and specify the Enum class name:

<property name="residence">
    <value type="SocialSecurity$Residence">ALIEN</value>
</property>

The advantage of this approach over just writing value="ALIEN" is that it also works if Spring can't infer the actual type of the enum from the property (e.g. the property's declared type is an interface).Adapted from araqnid's comment.

Is there an addHeaderView equivalent for RecyclerView?

HeaderView depends on the LayoutManager. None of the default LayoutManagers support this and probably wont. HeaderView in ListView creates a lot of complexity without any significant benefit.

I would suggest creating a base adapter class that adds items for Headers if provided. Don't forget to override notify* methods to offset them properly depending on whether header is present or not.

Check existence of directory and create if doesn't exist

One-liner:

if (!dir.exists(output_dir)) {dir.create(output_dir)}

Example:

dateDIR <- as.character(Sys.Date())
outputDIR <- file.path(outD, dateDIR)
if (!dir.exists(outputDIR)) {dir.create(outputDIR)}

UTF-8 text is garbled when form is posted as multipart/form-data

I had the same problem and it turned out that in addition to specifying the encoding in the Filter

request.setCharacterEncoding("UTF-8");
response.setCharacterEncoding("UTF-8");

it is necessary to add "acceptcharset" to the form

<form method="post" enctype="multipart/form-data" acceptcharset="UTF-8" > 

and run the JVM with

-Dfile.encoding=UTF-8

The HTML meta tag is not necessary if you send it in the HTTP header using response.setCharacterEncoding().

Add support library to Android Studio project

Android no longer downloading the libraries from the SDK manager, it has to be accessed through Google's Maven repository.

You will have to do something similar to this in your build.gradle file:

allprojects {
    repositories {
        jcenter()
        maven {
            url "https://maven.google.com"
        }
    }
}



dependencies {
    ...
    compile "com.android.support:support-core-utils:27.0.2"
}

Find more details about the setting up process here and about the different support library revisions here.

How to remove a field completely from a MongoDB document?

{ name: 'book', tags: { words: ['abc','123'], lat: 33, long: 22 } }

Ans:

db.tablename.remove({'tags.words':['abc','123']})

Coarse-grained vs fine-grained

Coarse-grained granularity does not always mean bigger components, if you go by literally meaning of the word coarse, it means harsh, or not appropriate. e.g. In software projects management, if you breakdown a small system into few components, which are equal in size, but varies in complexities and features, this could lead to a coarse-grained granularity. In reverse, for a fine-grained breakdown, you would divide the components based on their cohesiveness of the functionalities each component is providing.

Create a asmx web service in C# using visual studio 2013

Check your namespaces. I had and issue with that. I found that out by adding another web service to the project to dup it like you did yours and noticed the namespace was different. I had renamed it at the beginning of the project and it looks like its persisted.

Cannot find "Package Explorer" view in Eclipse

For Eclipse version 4.3.0.v20130605-2000. You can use the Java (default) perspective. In this perspective, it provides the Package Explorer view.

To use the Java (default) perspective: Window -> Open Perspective -> Other... -> Java (default) -> Ok

If you already use the Java (default) perspective but accidentally close the Package Explorer view, you can open it by; Window -> Show View -> Package Explorer (Alt+Shift+Q,P)

If the Package Explorer still doesn't appear in the Java (default) perspective, I suggest you to right-click on the Java (default) perspective button that is located in the top-right of the Eclipse IDE and then select Reset. The Java (default) perspective will show the Package Explorer view, Code pane, Outline view, Problems, JavaDoc and Declaration View.

C - casting int to char and append char to char

You can use itoa function to convert the integer to a string.

You can use strcat function to append characters in a string at the end of another string.

If you want to convert a integer to a character, just do the following -

int a = 65;
char c = (char) a;

Note that since characters are smaller in size than integer, this casting may cause a loss of data. It's better to declare the character variable as unsigned in this case (though you may still lose data).

To do a light reading about type conversion, go here.

If you are still having trouble, comment on this answer.

Edit

Go here for a more suitable example of joining characters.

Also some more useful link is given below -

  1. http://www.cplusplus.com/reference/clibrary/cstring/strncat/
  2. http://www.cplusplus.com/reference/clibrary/cstring/strcat/

Second Edit

char msg[200];
int msgLength;
char rankString[200];

........... // Your message has arrived
msgLength = strlen(msg);
itoa(rank, rankString, 10); // I have assumed rank is the integer variable containing the rank id

strncat( msg, rankString, (200 - msgLength) );  // msg now contains previous msg + id

// You may loose some portion of id if message length + id string length is greater than 200

Third Edit

Go to this link. Here you will find an implementation of itoa. Use that instead.

Bootstrap 3.0 - Fluid Grid that includes Fixed Column Sizes

Why not just set the left two columns to a fixed with in your own css and then make a new grid layout of the full 12 columns for the rest of the content?

<div class="row">
    <div class="fixed-1">Left 1</div>
    <div class="fixed-2">Left 2</div>
    <div class="row">
        <div class="col-md-1"></div>
        <div class="col-md-11"></div>
    </div>
</div>

open read and close a file in 1 line of code

Python Standard Library Pathlib module does what you looking for:

Path('pagehead.section.htm').read_text()

Don't forget to import Path:

jsk@dev1:~$ python3
Python 3.5.2 (default, Sep 10 2016, 08:21:44)
[GCC 5.4.0 20160609] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> from pathlib import Path
>>> (Path("/etc") / "hostname").read_text()
'dev1.example\n'

On Python 27 install backported pathlib or pathlib2

Efficient way of having a function only execute once in a loop

There are many ways to do what you want; however, do note that it is quite possible that —as described in the question— you don't have to call the function inside the loop.

If you insist in having the function call inside the loop, you can also do:

needs_to_run= expensive_function
while 1:
    …
    if needs_to_run: needs_to_run(); needs_to_run= None
    …

Activate a virtualenv with a Python script

The simplest solution to run your script under virtualenv's interpreter is to replace the default shebang line with path to your virtualenv's interpreter like so at the beginning of the script:

#!/path/to/project/venv/bin/python

Make the script executable:

chmod u+x script.py

Run the script:

./script.py

Voila!

HTTP could not register URL http://+:8000/HelloWCF/. Your process does not have access rights to this namespace

Your sample code won't work as shown because you forgot to include a Console.ReadLine() before the serviceHost.Close() line. That means the host is opened and then immediately closed.

Other than that, it seems you have a permission problem on your machine. Ensure you are logged-in as an administrator account on your machine. If you are an administrator then it may be that you don't have the World Wide Web Publishing Service (W3SVC) running to handle HTTP requests.

How to get single value from this multi-dimensional PHP array

Use array_shift function

$myarray = array_shift($myarray);

This will move array elements one level up and you can access any array element without using [0] key

echo $myarray['email'];  

will show [email protected]

YAML equivalent of array of objects in JSON

TL;DR

You want this:

AAPL:
  - shares: -75.088
    date: 11/27/2015
  - shares: 75.088
    date: 11/26/2015

Mappings

The YAML equivalent of a JSON object is a mapping, which looks like these:

# flow style
{ foo: 1, bar: 2 }
# block style
foo: 1
bar: 2

Note that the first characters of the keys in a block mapping must be in the same column. To demonstrate:

# OK
   foo: 1
   bar: 2
# Parse error
   foo: 1
    bar: 2

Sequences

The equivalent of a JSON array in YAML is a sequence, which looks like either of these (which are equivalent):

# flow style
[ foo bar, baz ]
# block style
- foo bar
- baz

In a block sequence the -s must be in the same column.

JSON to YAML

Let's turn your JSON into YAML. Here's your JSON:

{"AAPL": [
  {
    "shares": -75.088,
    "date": "11/27/2015"
  },
  {
    "shares": 75.088,
    "date": "11/26/2015"
  },
]}

As a point of trivia, YAML is a superset of JSON, so the above is already valid YAML—but let's actually use YAML's features to make this prettier.

Starting from the inside out, we have objects that look like this:

{
  "shares": -75.088,
  "date": "11/27/2015"
}

The equivalent YAML mapping is:

shares: -75.088
date: 11/27/2015

We have two of these in an array (sequence):

- shares: -75.088
  date: 11/27/2015
- shares: 75.088
  date: 11/26/2015

Note how the -s line up and the first characters of the mapping keys line up.

Finally, this sequence is itself a value in a mapping with the key AAPL:

AAPL:
  - shares: -75.088
    date: 11/27/2015
  - shares: 75.088
    date: 11/26/2015

Parsing this and converting it back to JSON yields the expected result:

{
  "AAPL": [
    {
      "date": "11/27/2015", 
      "shares": -75.088
    }, 
    {
      "date": "11/26/2015", 
      "shares": 75.088
    }
  ]
}

You can see it (and edit it interactively) here.

How to change background color in android app

This method worked for me:

RelativeLayout relativeLayout = (RelativeLayout) findViewById(R.layout.rootLayout);
relativeLayout.setBackgroundColor(getResources().getColor(R.color.bg_color_2));

Set id in layout xml

xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:id="@+id/rootLayout"
android:background="@color/background_color"

Add color values/color.xml

<color name="bg_color_2">#ffeef7f0</color>

HTML5 Canvas: Zooming

One option is to use css zoom feature:

$("#canvas_id").css("zoom","x%"); 

Netbeans - Error: Could not find or load main class

I had the same problem, I had the package and class named the same. I renamed the class, then clean and build. Then I set the main class in the "run" under the properties of the project. I works now.

Enable 'xp_cmdshell' SQL Server

While the accepted answer will work most of the times, I have encountered (still do not know why) some cases that is does not. A slight modification of the query by using the WITH OVERRIDE in RECONFIGURE gives the solution

Use Master
GO

EXEC master.dbo.sp_configure 'show advanced options', 1
RECONFIGURE WITH OVERRIDE
GO

EXEC master.dbo.sp_configure 'xp_cmdshell', 1
RECONFIGURE WITH OVERRIDE
GO

The expected output is

Configuration option 'show advanced options' changed from 0 to 1. Run the RECONFIGURE statement to install.
Configuration option 'xp_cmdshell' changed from 0 to 1. Run the RECONFIGURE statement to install.

Redirecting 404 error with .htaccess via 301 for SEO etc

I came up with the solution and posted it on my blog

http://web.archive.org/web/20130310123646/http://onlinemarketingexperts.com.au/2013/01/how-to-permanently-redirect-301-all-404-missing-pages-in-htaccess/

here is the htaccess code also

RewriteEngine on
RewriteCond %{REQUEST_FILENAME} !-f
RewriteRule . / [L,R=301]

but I posted other solutions on my blog too, it depends what you need really

VueJs get url query

I think you can simple call like this, this will give you result value.

this.$route.query.page

Look image $route is object in Vue Instance and you can access with this keyword and next you can select object properties like above one :

enter image description here

Have a look Vue-router document for selecting queries value :

Vue Router Object

Where does the .gitignore file belong?

In the simple case, a repository might have a single .gitignore file in its root directory, which applies recursively to the entire repository. However, it is also possible to have additional .gitignore files in subdirectories. The rules in these nested .gitignore files apply only to the files under the directory where they are located. The Linux kernel source repository has 206 .gitignore files.

-- this is what i read from progit.pdf(version 2), P32

Efficient evaluation of a function at every cell of a NumPy array

I believe I have found a better solution. The idea to change the function to python universal function (see documentation), which can exercise parallel computation under the hood.

One can write his own customised ufunc in C, which surely is more efficient, or by invoking np.frompyfunc, which is built-in factory method. After testing, this is more efficient than np.vectorize:

f = lambda x, y: x * y
f_arr = np.frompyfunc(f, 2, 1)
vf = np.vectorize(f)
arr = np.linspace(0, 1, 10000)

%timeit f_arr(arr, arr) # 307ms
%timeit f_arr(arr, arr) # 450ms

I have also tested larger samples, and the improvement is proportional. For comparison of performances of other methods, see this post

PHP array printing using a loop

If you're debugging something and just want to see what's in there for your the print_f function formats the output nicely.

Python: Writing to and Reading from serial port

ser.read(64) should be ser.read(size=64); ser.read uses keyword arguments, not positional.

Also, you're reading from the port twice; what you probably want to do is this:

i=0
for modem in PortList:
    for port in modem:
        try:
            ser = serial.Serial(port, 9600, timeout=1)
            ser.close()
            ser.open()
            ser.write("ati")
            time.sleep(3)
            read_val = ser.read(size=64)
            print read_val
            if read_val is not '':
                print port
        except serial.SerialException:
            continue
        i+=1

Select a Dictionary<T1, T2> with LINQ

A more explicit option is to project collection to an IEnumerable of KeyValuePair and then convert it to a Dictionary.

Dictionary<int, string> dictionary = objects
    .Select(x=> new KeyValuePair<int, string>(x.Id, x.Name))
    .ToDictionary(x=>x.Key, x=>x.Value);

How can I completely uninstall nodejs, npm and node in Ubuntu

It is better to remove NodeJS and its modules manually because installation leaves a lot of files, links and modules behind and later this creates problems when we reconfigure another version of NodeJS and its modules.

To remove the files, run the following commands:

sudo rm -rf /usr/local/bin/npm 
sudo rm -rf /usr/local/share/man/man1/node* 
sudo rm -rf /usr/local/lib/dtrace/node.d
rm -rf ~/.npm
rm -rf ~/.node-gyp
sudo rm -rf /opt/local/bin/node
sudo rm -rf /opt/local/include/node
sudo rm -rf /opt/local/lib/node_modules
sudo rm -rf /usr/local/lib/node*
sudo rm -rf /usr/local/include/node*
sudo rm -rf /usr/local/bin/node*

I have posted a step by step guide with commands on my blog: AMCOS IT Support For Windows and Linux: To completely uninstall node js from Ubuntu.

Flask example with POST

Before actually answering your question:

Parameters in a URL (e.g. key=listOfUsers/user1) are GET parameters and you shouldn't be using them for POST requests. A quick explanation of the difference between GET and POST can be found here.

In your case, to make use of REST principles, you should probably have:

http://ip:5000/users
http://ip:5000/users/<user_id>

Then, on each URL, you can define the behaviour of different HTTP methods (GET, POST, PUT, DELETE). For example, on /users/<user_id>, you want the following:

GET /users/<user_id> - return the information for <user_id>
POST /users/<user_id> - modify/update the information for <user_id> by providing the data
PUT - I will omit this for now as it is similar enough to `POST` at this level of depth
DELETE /users/<user_id> - delete user with ID <user_id> 

So, in your example, you want do a POST to /users/user_1 with the POST data being "John". Then the XPath expression or whatever other way you want to access your data should be hidden from the user and not tightly couple to the URL. This way, if you decide to change the way you store and access data, instead of all your URL's changing, you will simply have to change the code on the server-side.

Now, the answer to your question: Below is a basic semi-pseudocode of how you can achieve what I mentioned above:

from flask import Flask
from flask import request

app = Flask(__name__)

@app.route('/users/<user_id>', methods = ['GET', 'POST', 'DELETE'])
def user(user_id):
    if request.method == 'GET':
        """return the information for <user_id>"""
        .
        .
        .
    if request.method == 'POST':
        """modify/update the information for <user_id>"""
        # you can use <user_id>, which is a str but could
        # changed to be int or whatever you want, along
        # with your lxml knowledge to make the required
        # changes
        data = request.form # a multidict containing POST data
        .
        .
        .
    if request.method == 'DELETE':
        """delete user with ID <user_id>"""
        .
        .
        .
    else:
        # POST Error 405 Method Not Allowed
        .
        .
        .

There are a lot of other things to consider like the POST request content-type but I think what I've said so far should be a reasonable starting point. I know I haven't directly answered the exact question you were asking but I hope this helps you. I will make some edits/additions later as well.

Thanks and I hope this is helpful. Please do let me know if I have gotten something wrong.

Where can I find "make" program for Mac OS X Lion?

If you need only make and friends. Try installing the command-line-tools provided by Apple. (Assuming you are not doing any iOS development.)

Setting font on NSAttributedString on UITextView disregards line spacing

//For proper line spacing

NSString *text1 = @"Hello";
NSString *text2 = @"\nWorld";
UIFont *text1Font = [UIFont fontWithName:@"HelveticaNeue-Medium" size:10];
NSMutableAttributedString *attributedString1 =
[[NSMutableAttributedString alloc] initWithString:text1 attributes:@{ NSFontAttributeName : text1Font }];
NSMutableParagraphStyle *paragraphStyle1 = [[NSMutableParagraphStyle alloc] init];
[paragraphStyle1 setAlignment:NSTextAlignmentCenter];
[paragraphStyle1 setLineSpacing:4];
[attributedString1 addAttribute:NSParagraphStyleAttributeName value:paragraphStyle1 range:NSMakeRange(0, [attributedString1 length])];

UIFont *text2Font = [UIFont fontWithName:@"HelveticaNeue-Medium" size:16];
NSMutableAttributedString *attributedString2 =
[[NSMutableAttributedString alloc] initWithString:text2 attributes:@{NSFontAttributeName : text2Font }];
NSMutableParagraphStyle *paragraphStyle2 = [[NSMutableParagraphStyle alloc] init];
[paragraphStyle2 setLineSpacing:4];
[paragraphStyle2 setAlignment:NSTextAlignmentCenter];
[attributedString2 addAttribute:NSParagraphStyleAttributeName value:paragraphStyle2 range:NSMakeRange(0, [attributedString2 length])];

[attributedString1 appendAttributedString:attributedString2];

How to automatically select all text on focus in WPF TextBox?

Don't know why it loses the selection in the GotFocus event.

But one solution is to do the selection on the GotKeyboardFocus and the GotMouseCapture events. That way it will always work.

sql query to get earliest date

Try

select * from dataset
where id = 2
order by date limit 1

Been a while since I did sql, so this might need some tweaking.

first-child and last-child with IE8

Since :last-child is a CSS3 pseudo-class, it is not supported in IE8. I believe :first-child is supported, as it's defined in the CSS2.1 specification.

One possible solution is to simply give the last child a class name and style that class.

Another would be to use JavaScript. jQuery makes this particularly easy as it provides a :last-child pseudo-class which should work in IE8. Unfortunately, that could result in a flash of unstyled content while the DOM loads.

rsync: how can I configure it to create target directory on server?

from rsync manual (man rsync)

--mkpath create the destination's path component

How to switch to the new browser window, which opens after click on the button?

So the problem with a lot of these solutions is you're assuming the window appears instantly (nothing happens instantly, and things happen significantly less instantly in IE). Also you're assuming that there will only be one window prior to clicking the element, which is not always the case. Also IE will not return the window handles in a predictable order. So I would do the following.

 public String clickAndSwitchWindow(WebElement elementToClick, Duration 
    timeToWaitForWindowToAppear) {
    Set<String> priorHandles = _driver.getWindowHandles();

    elementToClick.click();
    try {
        new WebDriverWait(_driver,
                timeToWaitForWindowToAppear.getSeconds()).until(
                d -> {
                    Set<String> newHandles = d.getWindowHandles();
                    if (newHandles.size() > priorHandles.size()) {
                        for (String newHandle : newHandles) {
                            if (!priorHandles.contains(newHandle)) {
                                d.switchTo().window(newHandle);
                                return true;
                            }
                        }
                        return false;
                    } else {
                        return false;
                    }

                });
    } catch (Exception e) {
        Logging.log_AndFail("Encountered error while switching to new window after clicking element " + elementToClick.toString()
                + " seeing error: \n" + e.getMessage());
    }

    return _driver.getWindowHandle();
}

How can I scroll a web page using selenium webdriver in python?

scroll loading pages. Example: medium, quora,etc

last_height = driver.execute_script("return document.body.scrollHeight")
    while True:
        driver.execute_script("window.scrollTo(0, document.body.scrollHeight-1000);")
        # Wait to load the page.
        driver.implicitly_wait(30) # seconds
        new_height = driver.execute_script("return document.body.scrollHeight")
    
        if new_height == last_height:
            break
        last_height = new_height
        # sleep for 30s
        driver.implicitly_wait(30) # seconds
    driver.quit()

Error: select command denied to user '<userid>'@'<ip-address>' for table '<table-name>'

If you are working from a windows forms application this worked for me

"server=localhost; user id=dbuser; password=password; database=dbname; Use Procedure Bodies=false;"

Just add the "Use Procedure Bodies=false" at the end of your connection string.

SQL Developer is returning only the date, not the time. How do I fix this?

This will get you the hours, minutes and second. hey presto.

select
  to_char(CREATION_TIME,'RRRR') year, 
  to_char(CREATION_TIME,'MM') MONTH, 
  to_char(CREATION_TIME,'DD') DAY, 
  to_char(CREATION_TIME,'HH:MM:SS') TIME,
  sum(bytes) Bytes 
from 
  v$datafile 
group by 
  to_char(CREATION_TIME,'RRRR'), 
  to_char(CREATION_TIME,'MM'), 
  to_char(CREATION_TIME,'DD'), 
  to_char(CREATION_TIME,'HH:MM:SS') 
 ORDER BY 1, 2; 

How to call a VbScript from a Batch File without opening an additional command prompt

If you want to fix vbs associations type

regsvr32 vbscript.dll
regsvr32 jscript.dll
regsvr32 wshext.dll
regsvr32 wshom.ocx
regsvr32 wshcon.dll
regsvr32 scrrun.dll

Also if you can't use vbs due to management then convert your script to a vb.net program which is designed to be easy, is easy, and takes 5 minutes.

Big difference is functions and subs are both called using brackets rather than just functions.

So the compilers are installed on all computers with .NET installed.

See this article here on how to make a .NET exe. Note the sample is for a scripting host. You can't use this, you have to put your vbs code in as .NET code.

How can I convert a VBScript to an executable (EXE) file?

Starting ssh-agent on Windows 10 fails: "unable to start ssh-agent service, error :1058"

Yeah, as others have suggested, this error seems to mean that ssh-agent is installed but its service (on windows) hasn't been started.

You can check this by running in Windows PowerShell:

> Get-Service ssh-agent

And then check the output of status is not running.

Status   Name               DisplayName
------   ----               -----------
Stopped  ssh-agent          OpenSSH Authentication Agent

Then check that the service has been disabled by running

> Get-Service ssh-agent | Select StartType

StartType
---------
Disabled

I suggest setting the service to start manually. This means that as soon as you run ssh-agent, it'll start the service. You can do this through the Services GUI or you can run the command in admin mode:

 > Get-Service -Name ssh-agent | Set-Service -StartupType Manual

Alternatively, you can set it through the GUI if you prefer.

services.msc showing the properties of the OpenSSH Agent

Execute a terminal command from a Cocoa app

fork, exec, and wait should work, if you're not really looking for a Objective-C specific way. fork creates a copy of the currently running program, exec replaces the currently running program with a new one, and wait waits for the subprocess to exit. For example (without any error checking):

#include <stdlib.h>
#include <unistd.h>


pid_t p = fork();
if (p == 0) {
    /* fork returns 0 in the child process. */
    execl("/other/program/to/run", "/other/program/to/run", "foo", NULL);
} else {
    /* fork returns the child's PID in the parent. */
    int status;
    wait(&status);
    /* The child has exited, and status contains the way it exited. */
}

/* The child has run and exited by the time execution gets to here. */

There's also system, which runs the command as if you typed it from the shell's command line. It's simpler, but you have less control over the situation.

I'm assuming you're working on a Mac application, so the links are to Apple's documentation for these functions, but they're all POSIX, so you should be to use them on any POSIX-compliant system.

How to secure MongoDB with username and password

This answer is for Mongo 3.2.1 Reference

Terminal 1:

$ mongod --auth

Terminal 2:

db.createUser({user:"admin_name", pwd:"1234",roles:["readWrite","dbAdmin"]})

if you want to add without roles (optional):

db.createUser({user:"admin_name", pwd:"1234", roles:[]})

to check if authenticated or not:

db.auth("admin_name", "1234")

it should give you:

1

else :

Error: Authentication failed.
0

How can I convert my Java program to an .exe file?

You could make a batch file with the following code:

start javaw -jar JarFile.jar

and convert the .bat to an .exe using any .bat to .exe converter.

Why cannot cast Integer to String in java?

No, Integer and String are different types. To convert an integer to string use: String.valueOf(integer), or Integer.toString(integer) for primitive, or Integer.toString() for the object.

Why am I getting this error Premature end of file?

When you do this,

while((inputLine = buff_read.readLine())!= null){
        System.out.println(inputLine);
    }

You consume everything in instream, so instream is empty. Now when try to do this,

Document doc = builder.parse(instream);

The parsing will fail, because you have passed it an empty stream.

What is the hamburger menu icon called and the three vertical dots icon called?

Look at this photo, it says "Kebab Menu" is a correct answer:

enter image description here

per comment below, sourced from Luke Wroblewski: https://twitter.com/lukew/status/591296890030915585/photo/1

Check if string begins with something?

String.prototype.startsWith = function(needle)
{
    return this.indexOf(needle) === 0;
};

window.open with target "_blank" in Chrome

"_blank" is not guaranteed to be a new tab or window. It's implemented differently per-browser.

You can, however, put anything into target. I usually just say "_tab", and every browser I know of just opens it in a new tab.

Be aware that it means it's a named target, so if you try to open 2 URLs, they will use the same tab.

Removing duplicate objects with Underscore for Javascript

The lodash 4.6.1 docs have this as an example for object key equality:

_.uniqWith(objects, _.isEqual);

https://lodash.com/docs#uniqWith

Curl: Fix CURL (51) SSL error: no alternative certificate subject name matches

it might save some time to somebody.

If you use GuzzleHttp and you face with this error message cURL error 60: SSL: no alternative certificate subject name matches target host name and you are fine with the 'insecure' solution (not recommended on production) then you have to add \GuzzleHttp\RequestOptions::VERIFY => false to the client configuration:

$this->client = new \GuzzleHttp\Client([
    'base_uri'                          => 'someAccessPoint',
    \GuzzleHttp\RequestOptions::HEADERS => [
        'User-Agent' => 'some-special-agent',
    ],
    'defaults'                          => [
        \GuzzleHttp\RequestOptions::CONNECT_TIMEOUT => 5,
        \GuzzleHttp\RequestOptions::ALLOW_REDIRECTS => true,
    ],
    \GuzzleHttp\RequestOptions::VERIFY  => false,
]);

which sets CURLOPT_SSL_VERIFYHOST to 0 and CURLOPT_SSL_VERIFYPEER to false in the CurlFactory::applyHandlerOptions() method

$conf[CURLOPT_SSL_VERIFYHOST] = 0;
$conf[CURLOPT_SSL_VERIFYPEER] = false;

From the GuzzleHttp documentation

verify

Describes the SSL certificate verification behavior of a request.

  • Set to true to enable SSL certificate verification and use the default CA bundle > provided by operating system.
  • Set to false to disable certificate verification (this is insecure!).
  • Set to a string to provide the path to a CA bundle to enable verification using a custom certificate.

How can I comment a single line in XML?

As others have said, there is no way to do a single line comment legally in XML that comments out multiple lines, but, there are ways to make commenting out segments of XML easier.

Looking at the example below, if you add '>' to line one, the XmlTag will be uncommented. Remove the '>' and it's commented out again. This is the simplest way that I've seen to quickly comment/uncomment XML without breaking things.

<!-- --
<XmlTag variable="0" />
<!-- -->

The added benefit is that you only manipulate the top comment, and the bottom comment can just sit there forever. This breaks compatibility with SGML and some XML parsers will barf on it. So long as this isn't a permanent fixture in your XML, and your parsers accept it, it's not really a problem.

Stack Overflow's and Notepad++'s syntax highlighter treat it like a multi-line comment, C++'s Boost library treats it as a multi-line comment, and the only parser I've found so far that breaks is the one in .NET, specifically C#. So, be sure to first test that your tools, IDE, libraries, language, etc. accept it before using it.

If you care about SGML compatibility, simply use this instead:

<!-- -
<XmlTag variable="0" />
<!- -->

Add '->' to the top comment and a '-' to the bottom comment. The downside is having to edit the bottom comment each time, which would probably make it easier to just type in <!-- at the top and --> at the bottom each time.

I also want to mention that other commenters recommend using an XML editor that allows you to right-click and comment/uncomment blocks of XML, which is probably preferable over fancy find/replace tricks (it would also make for a good answer in itself, but I've never used such tools. I just want to make sure the information isn't lost over time). I've personally never had to deal with XML enough to justify having an editor fancier than Notepad++, so this is totally up to you.

How to embed a .mov file in HTML?

Well, if you don't want to do the work yourself (object elements aren't really all that hard), you could always use Mike Alsup's Media plugin: http://jquery.malsup.com/media/

Simple insecure two-way data "obfuscation"?

Other answers here work fine, but AES is a more secure and up-to-date encryption algorithm. This is a class that I obtained a few years ago to perform AES encryption that I have modified over time to be more friendly for web applications (e,g. I've built Encrypt/Decrypt methods that work with URL-friendly string). It also has the methods that work with byte arrays.

NOTE: you should use different values in the Key (32 bytes) and Vector (16 bytes) arrays! You wouldn't want someone to figure out your keys by just assuming that you used this code as-is! All you have to do is change some of the numbers (must be <= 255) in the Key and Vector arrays (I left one invalid value in the Vector array to make sure you do this...). You can use https://www.random.org/bytes/ to generate a new set easily:

Using it is easy: just instantiate the class and then call (usually) EncryptToString(string StringToEncrypt) and DecryptString(string StringToDecrypt) as methods. It couldn't be any easier (or more secure) once you have this class in place.


using System;
using System.Data;
using System.Security.Cryptography;
using System.IO;


public class SimpleAES
{
    // Change these keys
    private byte[] Key = __Replace_Me__({ 123, 217, 19, 11, 24, 26, 85, 45, 114, 184, 27, 162, 37, 112, 222, 209, 241, 24, 175, 144, 173, 53, 196, 29, 24, 26, 17, 218, 131, 236, 53, 209 });

    // a hardcoded IV should not be used for production AES-CBC code
    // IVs should be unpredictable per ciphertext
    private byte[] Vector = __Replace_Me__({ 146, 64, 191, 111, 23, 3, 113, 119, 231, 121, 2521, 112, 79, 32, 114, 156 });


    private ICryptoTransform EncryptorTransform, DecryptorTransform;
    private System.Text.UTF8Encoding UTFEncoder;

    public SimpleAES()
    {
        //This is our encryption method
        RijndaelManaged rm = new RijndaelManaged();

        //Create an encryptor and a decryptor using our encryption method, key, and vector.
        EncryptorTransform = rm.CreateEncryptor(this.Key, this.Vector);
        DecryptorTransform = rm.CreateDecryptor(this.Key, this.Vector);

        //Used to translate bytes to text and vice versa
        UTFEncoder = new System.Text.UTF8Encoding();
    }

    /// -------------- Two Utility Methods (not used but may be useful) -----------
    /// Generates an encryption key.
    static public byte[] GenerateEncryptionKey()
    {
        //Generate a Key.
        RijndaelManaged rm = new RijndaelManaged();
        rm.GenerateKey();
        return rm.Key;
    }

    /// Generates a unique encryption vector
    static public byte[] GenerateEncryptionVector()
    {
        //Generate a Vector
        RijndaelManaged rm = new RijndaelManaged();
        rm.GenerateIV();
        return rm.IV;
    }


    /// ----------- The commonly used methods ------------------------------    
    /// Encrypt some text and return a string suitable for passing in a URL.
    public string EncryptToString(string TextValue)
    {
        return ByteArrToString(Encrypt(TextValue));
    }

    /// Encrypt some text and return an encrypted byte array.
    public byte[] Encrypt(string TextValue)
    {
        //Translates our text value into a byte array.
        Byte[] bytes = UTFEncoder.GetBytes(TextValue);

        //Used to stream the data in and out of the CryptoStream.
        MemoryStream memoryStream = new MemoryStream();

        /*
         * We will have to write the unencrypted bytes to the stream,
         * then read the encrypted result back from the stream.
         */
        #region Write the decrypted value to the encryption stream
        CryptoStream cs = new CryptoStream(memoryStream, EncryptorTransform, CryptoStreamMode.Write);
        cs.Write(bytes, 0, bytes.Length);
        cs.FlushFinalBlock();
        #endregion

        #region Read encrypted value back out of the stream
        memoryStream.Position = 0;
        byte[] encrypted = new byte[memoryStream.Length];
        memoryStream.Read(encrypted, 0, encrypted.Length);
        #endregion

        //Clean up.
        cs.Close();
        memoryStream.Close();

        return encrypted;
    }

    /// The other side: Decryption methods
    public string DecryptString(string EncryptedString)
    {
        return Decrypt(StrToByteArray(EncryptedString));
    }

    /// Decryption when working with byte arrays.    
    public string Decrypt(byte[] EncryptedValue)
    {
        #region Write the encrypted value to the decryption stream
        MemoryStream encryptedStream = new MemoryStream();
        CryptoStream decryptStream = new CryptoStream(encryptedStream, DecryptorTransform, CryptoStreamMode.Write);
        decryptStream.Write(EncryptedValue, 0, EncryptedValue.Length);
        decryptStream.FlushFinalBlock();
        #endregion

        #region Read the decrypted value from the stream.
        encryptedStream.Position = 0;
        Byte[] decryptedBytes = new Byte[encryptedStream.Length];
        encryptedStream.Read(decryptedBytes, 0, decryptedBytes.Length);
        encryptedStream.Close();
        #endregion
        return UTFEncoder.GetString(decryptedBytes);
    }

    /// Convert a string to a byte array.  NOTE: Normally we'd create a Byte Array from a string using an ASCII encoding (like so).
    //      System.Text.ASCIIEncoding encoding = new System.Text.ASCIIEncoding();
    //      return encoding.GetBytes(str);
    // However, this results in character values that cannot be passed in a URL.  So, instead, I just
    // lay out all of the byte values in a long string of numbers (three per - must pad numbers less than 100).
    public byte[] StrToByteArray(string str)
    {
        if (str.Length == 0)
            throw new Exception("Invalid string value in StrToByteArray");

        byte val;
        byte[] byteArr = new byte[str.Length / 3];
        int i = 0;
        int j = 0;
        do
        {
            val = byte.Parse(str.Substring(i, 3));
            byteArr[j++] = val;
            i += 3;
        }
        while (i < str.Length);
        return byteArr;
    }

    // Same comment as above.  Normally the conversion would use an ASCII encoding in the other direction:
    //      System.Text.ASCIIEncoding enc = new System.Text.ASCIIEncoding();
    //      return enc.GetString(byteArr);    
    public string ByteArrToString(byte[] byteArr)
    {
        byte val;
        string tempStr = "";
        for (int i = 0; i <= byteArr.GetUpperBound(0); i++)
        {
            val = byteArr[i];
            if (val < (byte)10)
                tempStr += "00" + val.ToString();
            else if (val < (byte)100)
                tempStr += "0" + val.ToString();
            else
                tempStr += val.ToString();
        }
        return tempStr;
    }
}

What is the recommended way to delete a large number of items from DynamoDB?

If you want to delete items after some time, e.g. after a month, just use Time To Live option. It will not count write units.

In your case, I would add ttl when logs expire and leave those after a user is deleted. TTL would make sure logs are removed eventually.

When Time To Live is enabled on a table, a background job checks the TTL attribute of items to see if they are expired.

DynamoDB typically deletes expired items within 48 hours of expiration. The exact duration within which an item truly gets deleted after expiration is specific to the nature of the workload and the size of the table. Items that have expired and not been deleted will still show up in reads, queries, and scans. These items can still be updated and successful updates to change or remove the expiration attribute will be honored.

https://docs.aws.amazon.com/amazondynamodb/latest/developerguide/TTL.html https://docs.aws.amazon.com/amazondynamodb/latest/developerguide/howitworks-ttl.html

CMake does not find Visual C++ compiler

This might be another solution for those with the latest Windows 10 creator version:

Stack Overflow post Fatal error LNK1104: cannot open file 'gdi32.lib'

Importing files from different folder

I think an ad-hoc way would be to use the environment variable PYTHONPATH as described in the documentation: Python2, Python3

# Linux & OSX
export PYTHONPATH=$HOME/dirWithScripts/:$PYTHONPATH

# Windows
set PYTHONPATH=C:\path\to\dirWithScripts\;%PYTHONPATH%

The request was aborted: Could not create SSL/TLS secure channel

The approach with setting

ServicePointManager.SecurityProtocol = SecurityProtocolType.Tls12

Seems to be okay, because Tls1.2 is latest version of secure protocol. But I decided to look deeper and answer do we really need to hardcode it.

Specs: Windows Server 2012R2 x64.

From the internet there is told that .NetFramework 4.6+ must use Tls1.2 by default. But when I updated my project to 4.6 nothing happened. I have found some info that tells I need manually do some changes to enable Tls1.2 by default

https://support.microsoft.com/en-in/help/3140245/update-to-enable-tls-1-1-and-tls-1-2-as-default-secure-protocols-in-wi

But proposed windows update doesnt work for R2 version

But what helped me is adding 2 values to registry. You can use next PS script so they will be added automatically

Set-ItemProperty -Path 'HKLM:\SOFTWARE\Wow6432Node\Microsoft\.NetFramework\v4.0.30319' -Name 'SchUseStrongCrypto' -Value '1' -Type DWord
Set-ItemProperty -Path 'HKLM:\SOFTWARE\Microsoft\.NetFramework\v4.0.30319' -Name 'SchUseStrongCrypto' -Value '1' -Type DWord

That is kind of what I was looking for. But still I cant answer on question why NetFramework 4.6+ doesn't set this ...Protocol value automatically?

How to create a checkbox with a clickable label?

In Angular material label with checkbox

<mat-checkbox>Check me!</mat-checkbox>

Add a prefix string to beginning of each line

Using ed:

ed infile <<'EOE'
,s/^/prefix/
wq
EOE

This substitutes, for each line (,), the beginning of the line (^) with prefix. wq saves and exits.

If the replacement string contains a slash, we can use a different delimiter for s instead:

ed infile <<'EOE'
,s#^#/opt/workdir/#
wq
EOE

I've quoted the here-doc delimiter EOE ("end of ed") to prevent parameter expansion. In this example, it would work unquoted as well, but it's good practice to prevent surprises if you ever have a $ in your ed script.

How get data from material-ui TextField, DropDownMenu components?

use the accepted answer / this was the answer to another (already deleted) question

@karopastal

add a ref attribute to your <TextField /> component and call getValue() on it, like this:

Component:

<TextField ref="myField" />

Using getValue:

this.refs.myField.getValue()

"Full screen" <iframe>

You can also use viewport-percentage lengths to achieve this:

5.1.2. Viewport-percentage lengths: the ‘vw’, ‘vh’, ‘vmin’, ‘vmax’ units

The viewport-percentage lengths are relative to the size of the initial containing block. When the height or width of the initial containing block is changed, they are scaled accordingly.

Where 100vh represents the height of the viewport, and likewise 100vw represents the width.

Example Here

_x000D_
_x000D_
body {_x000D_
    margin: 0;            /* Reset default margin */_x000D_
}_x000D_
iframe {_x000D_
    display: block;       /* iframes are inline by default */_x000D_
    background: #000;_x000D_
    border: none;         /* Reset default border */_x000D_
    height: 100vh;        /* Viewport-relative units */_x000D_
    width: 100vw;_x000D_
}
_x000D_
<iframe></iframe>
_x000D_
_x000D_
_x000D_

This is supported in most modern browsers - support can be found here.

How to execute VBA Access module?

Well it depends on how you want to call this code.

Are you calling it from a button click on a form, if so then on the properties for the button on form, go to the Event tab, then On Click item, select [Event Procedure]. This will open the VBA code window for that button. You would then call your Module.Routine and then this would trigger when you click the button.

Similar to this:

Private Sub Command1426_Click()
    mdl_ExportMorning.ExportMorning
End Sub

This button click event calls the Module mdl_ExportMorning and the Public Sub ExportMorning.

Search text in fields in every table of a MySQL database

I am use HeidiSQL is a useful and reliable tool designed for web developers using the popular MySQL server.

In HeidiSQL you can push shift + ctrl + f and you can find text on the server in all tables. This option is very usefully.

How can I print the contents of an array horizontally?

int[] n=new int[5];

for (int i = 0; i < 5; i++)
{
    n[i] = i + 100;
}

foreach (int j in n)
{
    int i = j - 100;

    Console.WriteLine("Element [{0}]={1}", i, j);
    i++;
}

LINQ to SQL using GROUP BY and COUNT(DISTINCT)

There isn't direct support for COUNT(DISTINCT {x})), but you can simulate it from an IGrouping<,> (i.e. what group by returns); I'm afraid I only "do" C#, so you'll have to translate to VB...

 select new
 {
     Foo= grp.Key,
     Bar= grp.Select(x => x.SomeField).Distinct().Count()
 };

Here's a Northwind example:

    using(var ctx = new DataClasses1DataContext())
    {
        ctx.Log = Console.Out; // log TSQL to console
        var qry = from cust in ctx.Customers
                  where cust.CustomerID != ""
                  group cust by cust.Country
                  into grp
                  select new
                  {
                      Country = grp.Key,
                      Count = grp.Select(x => x.City).Distinct().Count()
                  };

        foreach(var row in qry.OrderBy(x=>x.Country))
        {
            Console.WriteLine("{0}: {1}", row.Country, row.Count);
        }
    }

The TSQL isn't quite what we'd like, but it does the job:

SELECT [t1].[Country], (
    SELECT COUNT(*)
    FROM (
        SELECT DISTINCT [t2].[City]
        FROM [dbo].[Customers] AS [t2]
        WHERE ((([t1].[Country] IS NULL) AND ([t2].[Country] IS NULL)) OR (([t1]
.[Country] IS NOT NULL) AND ([t2].[Country] IS NOT NULL) AND ([t1].[Country] = [
t2].[Country]))) AND ([t2].[CustomerID] <> @p0)
        ) AS [t3]
    ) AS [Count]
FROM (
    SELECT [t0].[Country]
    FROM [dbo].[Customers] AS [t0]
    WHERE [t0].[CustomerID] <> @p0
    GROUP BY [t0].[Country]
    ) AS [t1]
-- @p0: Input NVarChar (Size = 0; Prec = 0; Scale = 0) []
-- Context: SqlProvider(Sql2008) Model: AttributedMetaModel Build: 3.5.30729.1

The results, however, are correct- verifyable by running it manually:

        const string sql = @"
SELECT c.Country, COUNT(DISTINCT c.City) AS [Count]
FROM Customers c
WHERE c.CustomerID != ''
GROUP BY c.Country
ORDER BY c.Country";
        var qry2 = ctx.ExecuteQuery<QueryResult>(sql);
        foreach(var row in qry2)
        {
            Console.WriteLine("{0}: {1}", row.Country, row.Count);
        }

With definition:

class QueryResult
{
    public string Country { get; set; }
    public int Count { get; set; }
}

JavaScript: How to find out if the user browser is Chrome?

User could change user agent . Try testing for webkit prefixed property in style object of body element

if ("webkitAppearance" in document.body.style) {
  // do stuff
}

ASP.Net MVC: How to display a byte array image from model

One way is to add this to a new c# class or HtmlExtensions class

public static class HtmlExtensions
{
    public static MvcHtmlString Image(this HtmlHelper html, byte[] image)
    {
        var img = String.Format("data:image/jpg;base64,{0}", Convert.ToBase64String(image));
        return new MvcHtmlString("<img src='" + img + "' />");
    }
}

then you can do this in any view

@Html.Image(Model.ImgBytes)

How to read file with async/await properly?

Since Node v11.0.0 fs promises are available natively without promisify:

const fs = require('fs').promises;
async function loadMonoCounter() {
    const data = await fs.readFile("monolitic.txt", "binary");
    return new Buffer(data);
}

Last executed queries for a specific database

This works for me to find queries on any database in the instance. I'm sysadmin on the instance (check your privileges):

SELECT deqs.last_execution_time AS [Time], dest.text AS [Query], dest.*
FROM sys.dm_exec_query_stats AS deqs
CROSS APPLY sys.dm_exec_sql_text(deqs.sql_handle) AS dest
WHERE dest.dbid = DB_ID('msdb')
ORDER BY deqs.last_execution_time DESC

This is the same answer that Aaron Bertrand provided but it wasn't placed in an answer.

selecting unique values from a column

Use something like this in case you also want to output products details per date as JSON and the MySQL version does not support JSON functions.

SELECT `date`,
CONCAT('{',GROUP_CONCAT('{\"id\": \"',`product_id`,'\",\"name\": \"',`product_name`,'\"}'),'}') as `productsJSON`
FROM `buy` group by `date` 
order by `date` DESC

 product_id product_name     date  
|    1     |     azd    | 2011-12-12 |
|    2     |     xyz    | 2011-12-12 |
|    3     |     ase    | 2011-12-11 |
|    4     |     azwed  | 2011-12-11 |
|    5     |     wed    | 2011-12-10 |
|    6     |     cvg    | 2011-12-10 |
|    7     |     cvig   | 2011-12-09 |

RESULT
       date                                productsJSON
2011-12-12T00:00:00Z    {{"id": "1","name": "azd"},{"id": "2","name": "xyz"}}
2011-12-11T00:00:00Z    {{"id": "3","name": "ase"},{"id": "4","name": "azwed"}}
2011-12-10T00:00:00Z    {{"id": "5","name": "wed"},{"id": "6","name": "cvg"}}
2011-12-09T00:00:00Z    {{"id": "7","name": "cvig"}}

Try it out in SQL Fiddle

If you are using a MySQL version that supports JSON functions then the above query could be re-written:

SELECT `date`,JSON_OBJECTAGG(CONCAT('product-',`product_id`),JSON_OBJECT('id', `product_id`, 'name', `product_name`)) as `productsJSON`
FROM `buy` group by `date`
order by `date` DESC;

Try both in DB Fiddle

Disable autocomplete via CSS

I just use 'new-password' instead 'off' on autocomplete.

and I also have try using this code and works (at least on my end), I use WP and GravityForm for your information

$('input').attr('autocomplete','new-password');

Flatten nested dictionaries, compressing keys

If you want to flat nested dictionary and want all unique keys list then here is the solution:

def flat_dict_return_unique_key(data, unique_keys=set()):
    if isinstance(data, dict):
        [unique_keys.add(i) for i in data.keys()]
        for each_v in data.values():
            if isinstance(each_v, dict):
                flat_dict_return_unique_key(each_v, unique_keys)
    return list(set(unique_keys))

Simple way to compare 2 ArrayLists

List<String> oldList = Arrays.asList("a", "b", "c", "d", "e", "f");
List<String> modifiedList = Arrays.asList("a", "b", "c", "d", "e", "g");

List<String> added = new HashSet<>(modifiedList);
List<String> removed = new HashSet<>(oldList);

modifiedList.stream().filter(removed::remove).forEach(added::remove);

// added items
System.out.println(added);
// removed items
System.out.println(removed);

How to get current screen width in CSS?

Use the CSS3 Viewport-percentage feature.

Viewport-Percentage Explanation

Assuming you want the body width size to be a ratio of the browser's view port. I added a border so you can see the body resize as you change your browser width or height. I used a ratio of 90% of the view-port size.

_x000D_
_x000D_
<!DOCTYPE html>_x000D_
<html lang="en">_x000D_
<head>_x000D_
    <title>Styles</title>_x000D_
_x000D_
    <style>_x000D_
        @media screen and (min-width: 480px) {_x000D_
            body {_x000D_
                background-color: skyblue;_x000D_
                width: 90vw;_x000D_
                height: 90vh;_x000D_
                border: groove black;_x000D_
            }_x000D_
_x000D_
            div#main {_x000D_
                font-size: 3vw;_x000D_
            }_x000D_
        }_x000D_
    </style>_x000D_
_x000D_
</head>_x000D_
<body>_x000D_
    <div id="main">_x000D_
        Viewport-Percentage Test_x000D_
    </div>_x000D_
</body>_x000D_
</html>
_x000D_
_x000D_
_x000D_

how to create Socket connection in Android?

Here, in this post you will find the detailed code for establishing socket between devices or between two application in the same mobile.

You have to create two application to test below code.

In both application's manifest file, add below permission

<uses-permission android:name="android.permission.INTERNET" />

1st App code: Client Socket

activity_main.xml

<?xml version="1.0" encoding="utf-8"?>

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

    <TableRow
        android:id="@+id/tr_send_message"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:gravity="center"
        android:layout_alignParentLeft="true"
        android:layout_alignParentStart="true"
        android:layout_alignParentTop="true"
        android:layout_marginTop="11dp">

        <EditText
            android:id="@+id/edt_send_message"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:layout_marginRight="10dp"
            android:layout_marginLeft="10dp"
            android:hint="Enter message"
            android:inputType="text" />

        <Button
            android:id="@+id/btn_send"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_marginRight="10dp"
            android:text="Send" />
    </TableRow>

    <ScrollView
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:layout_alignParentLeft="true"
        android:layout_alignParentStart="true"
        android:layout_below="@+id/tr_send_message"
        android:layout_marginTop="25dp"
        android:id="@+id/scrollView2">

        <TextView
            android:id="@+id/tv_reply_from_server"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:orientation="vertical" />
    </ScrollView>
</RelativeLayout>

MainActivity.java

import android.os.Bundle;
import android.os.Handler;
import android.support.v7.app.AppCompatActivity;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.io.PrintWriter;
import java.net.Socket;

/**
 * Created by Girish Bhalerao on 5/4/2017.
 */
public class MainActivity extends AppCompatActivity implements View.OnClickListener {

    private TextView mTextViewReplyFromServer;
    private EditText mEditTextSendMessage;

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

        Button buttonSend = (Button) findViewById(R.id.btn_send);

        mEditTextSendMessage = (EditText) findViewById(R.id.edt_send_message);
        mTextViewReplyFromServer = (TextView) findViewById(R.id.tv_reply_from_server);

        buttonSend.setOnClickListener(this);
    }

    @Override
    public void onClick(View v) {

        switch (v.getId()) {

            case R.id.btn_send:
                sendMessage(mEditTextSendMessage.getText().toString());
                break;
        }
    }

    private void sendMessage(final String msg) {

        final Handler handler = new Handler();
        Thread thread = new Thread(new Runnable() {
            @Override
            public void run() {

                try {
                    //Replace below IP with the IP of that device in which server socket open.
                    //If you change port then change the port number in the server side code also.
                    Socket s = new Socket("xxx.xxx.xxx.xxx", 9002);

                    OutputStream out = s.getOutputStream();

                    PrintWriter output = new PrintWriter(out);

                    output.println(msg);
                    output.flush();
                    BufferedReader input = new BufferedReader(new InputStreamReader(s.getInputStream()));
                    final String st = input.readLine();

                    handler.post(new Runnable() {
                        @Override
                        public void run() {

                            String s = mTextViewReplyFromServer.getText().toString();
                            if (st.trim().length() != 0)
                                mTextViewReplyFromServer.setText(s + "\nFrom Server : " + st);
                        }
                    });

                    output.close();
                    out.close();
                    s.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        });

        thread.start();
    }
}

2nd App Code - Server Socket

activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

    <Button
        android:id="@+id/btn_stop_receiving"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="STOP Receiving data"
        android:layout_alignParentTop="true"
        android:enabled="false"
        android:layout_centerHorizontal="true"
        android:layout_marginTop="89dp" />

    <ScrollView
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:layout_below="@+id/btn_stop_receiving"
        android:layout_marginTop="35dp"
        android:layout_alignParentLeft="true"
        android:layout_alignParentStart="true">

        <TextView
            android:id="@+id/tv_data_from_client"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:orientation="vertical" />
    </ScrollView>

    <Button
        android:id="@+id/btn_start_receiving"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="START Receiving data"
        android:layout_alignParentTop="true"
        android:layout_centerHorizontal="true"
        android:layout_marginTop="14dp" />
</RelativeLayout>

MainActivity.java

import android.os.Bundle;
import android.os.Handler;
import android.support.v7.app.AppCompatActivity;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.PrintWriter;
import java.net.ServerSocket;
import java.net.Socket;

/**
 * Created by Girish Bhalerao on 5/4/2017.
 */
public class MainActivity extends AppCompatActivity implements View.OnClickListener {

    final Handler handler = new Handler();

    private Button buttonStartReceiving;
    private Button buttonStopReceiving;
    private TextView textViewDataFromClient;
    private boolean end = false;

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

        buttonStartReceiving = (Button) findViewById(R.id.btn_start_receiving);
        buttonStopReceiving = (Button) findViewById(R.id.btn_stop_receiving);
        textViewDataFromClient = (TextView) findViewById(R.id.tv_data_from_client);

        buttonStartReceiving.setOnClickListener(this);
        buttonStopReceiving.setOnClickListener(this);

    }

    private void startServerSocket() {

        Thread thread = new Thread(new Runnable() {

            private String stringData = null;

            @Override
            public void run() {

                try {

                    ServerSocket ss = new ServerSocket(9002);

                    while (!end) {
                        //Server is waiting for client here, if needed
                        Socket s = ss.accept();
                        BufferedReader input = new BufferedReader(new InputStreamReader(s.getInputStream()));
                        PrintWriter output = new PrintWriter(s.getOutputStream());

                        stringData = input.readLine();
                        output.println("FROM SERVER - " + stringData.toUpperCase());
                        output.flush();

                        try {
                            Thread.sleep(1000);
                        } catch (InterruptedException e) {
                            e.printStackTrace();
                        }
                        updateUI(stringData);
                        if (stringData.equalsIgnoreCase("STOP")) {
                            end = true;
                            output.close();
                            s.close();
                            break;
                        }

                        output.close();
                        s.close();
                    }
                    ss.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }

        });
        thread.start();
    }

    private void updateUI(final String stringData) {

        handler.post(new Runnable() {
            @Override
            public void run() {

                String s = textViewDataFromClient.getText().toString();
                if (stringData.trim().length() != 0)
                    textViewDataFromClient.setText(s + "\n" + "From Client : " + stringData);
            }
        });
    }

    @Override
    public void onClick(View v) {

        switch (v.getId()) {
            case R.id.btn_start_receiving:

                startServerSocket();
                buttonStartReceiving.setEnabled(false);
                buttonStopReceiving.setEnabled(true);
                break;

            case R.id.btn_stop_receiving:

                //stopping server socket logic you can add yourself
                buttonStartReceiving.setEnabled(true);
                buttonStopReceiving.setEnabled(false);
                break;
        }
    }
}

How to remove Left property when position: absolute?

In the future one would use left: unset; for unsetting the value of left.

As of today 4 nov 2014 unset is only supported in Firefox.

Read more about unset in MDN.

My guess is we'll be able to use it around year 2022 when IE 11 is properly phased out.

"Uncaught Error: [$injector:unpr]" with angular after deployment

If you have separated files for angular app\resources\directives and other stuff then you can just disable minification of your angular app bundle like this (use new Bundle() instead of ScriptBundle() in your bundle config file):

bundles.Add(
new Bundle("~/bundles/angular/SomeBundleName").Include(
               "~/Content/js/angular/Pages/Web/MainPage/angularApi.js",
               "~/Content/js/angular/Pages/Web/MainPage/angularApp.js",
               "~/Content/js/angular/Pages/Web/MainPage/angularCtrl.js"));

And angular app would appear in bundle unmodified.

How to get address location from latitude and longitude in Google Map.?

You have to make one ajax call to get the required result, in this case you can use Google API to get the same

http://maps.googleapis.com/maps/api/geocode/json?latlng=40.714224,-73.961452&sensor=true/false

Build this kind of url and replace the lat long with the one you want to. do the call and response will be in JSON, parse the JSON and you will get the complete address up to street level

Get last n lines of a file, similar to tail

I found a probably the easiest way to find the first or last N lines of a file

Last N lines of a file(For Ex:N=10)

file=open("xyz.txt",'r")
liner=file.readlines()
for ran in range((len(liner)-N),len(liner)):
    print liner[ran]

First N lines of a file(For Ex:N=10)

file=open("xyz.txt",'r")
liner=file.readlines()
for ran in range(0,N+1):
    print liner[ran]

How to get an object's properties in JavaScript / jQuery?

To get listing of object properties/values:

  1. In Firefox - Firebug:

    console.dir(<object>);
    
  2. Standard JS to get object keys borrowed from Slashnick:

       var fGetKeys = function(obj){
          var keys = [];
          for(var key in obj){
             keys.push(key);
          }
          return keys;
       }
    
    // Example to call it:
    
       var arrKeys = fGetKeys(document);
    
       for (var i=0, n=arrKeys.length; i<n; i++){
          console.log(i+1 + " - " + arrKeys[i] + document[arrKeys[i]] + "\n");
       }
    

Edits:

  1. <object> in the above is to be replaced with the variable reference to the object.
  2. console.log() is to be used in the console, if you're unsure what that is, you can replace it with an alert()

Question mark characters displaying within text, why is this?

Check the character set being emitted by your mirrored server. There appears to be a difference from that to the main server -- the live site appears to be outputting Unicode, where the mirror is not. Also, it's usually a good idea to scrub Unicode characters in your incoming content and replace them with their appropriate HTML entities.

Your specific issue regards "smart quotes," "em dashes" and "en dashes." I know you can replace em dashes with &mdash; and n-dashes with &ndash; (which should be done on the input side of your database); I don't know what the correct replacement for the smart quotes would be. (I usually just replace all curly single quotes with ' and all curly double quotes with " ... Typography geeks may feel free to shoot me on sight.)

I should note that some browsers are more forgiving than others with this issue -- Internet Explorer on Windows tends to auto-magically detect and "fix" this; Firefox and most other browsers display the question marks.

Use curly braces to initialize a Set in Python

There are two obvious issues with the set literal syntax:

my_set = {'foo', 'bar', 'baz'}
  1. It's not available before Python 2.7

  2. There's no way to express an empty set using that syntax (using {} creates an empty dict)

Those may or may not be important to you.

The section of the docs outlining this syntax is here.

grep output to show only matching file

-l (that's a lower-case L).

how to add values to an array of objects dynamically in javascript?

You have to instantiate the object first. The simplest way is:

var lab =["1","2","3"];
var val = [42,55,51,22];
var data = [];
for(var i=0; i<4; i++)  {
    data.push({label: lab[i], value: val[i]});
}

Or an other, less concise way, but closer to your original code:

for(var i=0; i<4; i++)  {
   data[i] = {};              // creates a new object
   data[i].label = lab[i];
   data[i].value = val[i];    
}

array() will not create a new array (unless you defined that function). Either Array() or new Array() or just [].

I recommend to read the MDN JavaScript Guide.

Remove Array Value By index in jquery

Your syntax is incorrect, you should either specify a hash:

hash = {abc: true, def: true, ghi: true};

Or an array:

arr = ['abc','def','ghi'];

You can effectively remove an item from a hash by simply setting it to null:

hash['def'] = null;
hash.def = null;

Or removing it entirely:

delete hash.def;

To remove an item from an array you have to iterate through each item and find the one you want (there may be duplicates). You could use array searching and splicing methods:

arr.splice(arr.indexOf("def"), 1);

This finds the first index of "def" and then removes it from the array with splice. However I would recommend .filter() because it gives you more control:

arr.filter(function(item) { return item !== 'def'; });

This will create a new array with only elements that are not 'def'.

It is important to note that arr.filter() will return a new array, while arr.splice will modify the original array and return the removed elements. These can both be useful, depending on what you want to do with the items.

Jquery - Uncaught TypeError: Cannot use 'in' operator to search for '324' in

You can also use $.parseJSON(data) that will explicit convert a string thats come from a PHP script to a real JSON array.

select2 onchange event only works once

As of version 4.0.0, events such as select2-selecting, no longer work. They are renamed as follows:

  • select2-close is now select2:close
  • select2-open is now select2:open
  • select2-opening is now select2:opening
  • select2-selecting is now select2:selecting
  • select2-removed is now select2:removed
  • select2-removing is now select2:unselecting

Ref: https://select2.org/programmatic-control/events

_x000D_
_x000D_
(function($){_x000D_
  $('.select2').select2();_x000D_
  _x000D_
  $('.select2').on('select2:selecting', function(e) {_x000D_
    console.log('Selecting: ' , e.params.args.data);_x000D_
  });_x000D_
})(jQuery);
_x000D_
body{_x000D_
  font-family: sans-serif;_x000D_
}_x000D_
_x000D_
.select2{_x000D_
  width: 100%;_x000D_
}
_x000D_
<link href="https://cdnjs.cloudflare.com/ajax/libs/select2/4.0.3/css/select2.min.css" rel="stylesheet">_x000D_
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>_x000D_
<script src="https://cdnjs.cloudflare.com/ajax/libs/select2/4.0.3/js/select2.full.min.js"></script>_x000D_
_x000D_
<select class="select2" multiple="multiple">_x000D_
  <option value="1">Option 1</option>_x000D_
  <option value="2">Option 2</option>_x000D_
  <option value="3">Option 3</option>_x000D_
  <option value="4">Option 4</option>_x000D_
  <option value="5">Option 5</option>_x000D_
  <option value="6">Option 6</option>_x000D_
  <option value="7">Option 7</option>_x000D_
</select>
_x000D_
_x000D_
_x000D_

How to get all keys with their values in redis

There is no native way of doing this.

The Redis command documentation contains no native commands for getting the key and value of multiple keys.

The most native way of doing this would be to load a lua script into your redis using the SCRIPT LOAD command or the EVAL command.

Bash Haxx solution

A workaround would be to use some bash magic, like this:

echo 'keys YOURKEY*' | redis-cli | sed 's/^/get /' | redis-cli 

This will output the data from all the keys which begin with YOURKEY

Note that the keys command is a blocking operation and should be used with care.

UINavigationBar Hide back Button Text

In the interface builder, you can select the navigation item of the previous controller and change the Back Button string to what you'd like the back button to appear as. If you want it blank, for example, just put a space.

You can also change it with this line of code:

[self.navigationItem.backBarButtonItem setTitle:@"Title here"];

Or in Swift:

self.navigationItem.backBarButtonItem?.title = ""

Two-dimensional array in Swift

You should be careful when you're using Array(repeating: Array(repeating: {value}, count: 80), count: 24).

If the value is an object, which is initialized by MyClass(), then they will use the same reference.

Array(repeating: Array(repeating: MyClass(), count: 80), count: 24) doesn't create a new instance of MyClass in each array element. This method only creates MyClass once and puts it into the array.

Here's a safe way to initialize a multidimensional array.

private var matrix: [[MyClass]] = MyClass.newMatrix()

private static func newMatrix() -> [[MyClass]] {
    var matrix: [[MyClass]] = []

    for i in 0...23 {
        matrix.append( [] )

        for _ in 0...79 {
            matrix[i].append( MyClass() )
        }
    }

    return matrix
}

MySQL: When is Flush Privileges in MySQL really needed?

2 points in addition to all other good answers:

1:

what are the Grant Tables?

from dev.mysql.com

The MySQL system database includes several grant tables that contain information about user accounts and the privileges held by them.

clari?cation: in MySQL, there are some inbuilt databases , one of them is "mysql" , all the tables on "mysql" database have been called as grant tables

2:

note that if you perform:

UPDATE a_grant_table SET password=PASSWORD('1234') WHERE test_col = 'test_val';

and refresh phpMyAdmin , you'll realize that your password has been changed on that table but even now if you perform:

mysql -u someuser -p

your access will be denied by your new password until you perform :

FLUSH PRIVILEGES;

How do you align left / right a div without using float?

No need to add extra elements. While flexbox uses very non-intuitive property names if you know what it can do you'll find yourself using it quite often.

<div style="display: flex; justify-content: space-between;">
<span>Item Left</span>
<span>Item Right</span>
</div>

Plan on needing this often?

.align_between {display: flex; justify-content: space-between;}

I see other people using secondary words in the primary position which makes a mess of information hierarchy. If align is the primary task and right, left, and/or between are the secondary the class should be .align_outer, not .outer_align as it will make sense as you vertically scan your code:

.align_between {}
.align_left {}
.align_outer {}
.align_right {}

Good habits over time will allow you to get to bed sooner than later.

How to extract a single value from JSON response?

using json.loads will turn your data into a python dictionary.

Dictionaries values are accessed using ['key']

resp_str = {
  "name" : "ns1:timeSeriesResponseType",
  "declaredType" : "org.cuahsi.waterml.TimeSeriesResponseType",
  "scope" : "javax.xml.bind.JAXBElement$GlobalScope",
  "value" : {
    "queryInfo" : {
      "creationTime" : 1349724919000,
      "queryURL" : "http://waterservices.usgs.gov/nwis/iv/",
      "criteria" : {
        "locationParam" : "[ALL:103232434]",
        "variableParam" : "[00060, 00065]"
      },
      "note" : [ {
        "value" : "[ALL:103232434]",
        "title" : "filter:sites"
      }, {
        "value" : "[mode=LATEST, modifiedSince=null]",
        "title" : "filter:timeRange"
      }, {
        "value" : "sdas01",
        "title" : "server"
      } ]
    }
  },
  "nil" : false,
  "globalScope" : true,
  "typeSubstituted" : false
}

would translate into a python diction

resp_dict = json.loads(resp_str)

resp_dict['name'] # "ns1:timeSeriesResponseType"

resp_dict['value']['queryInfo']['creationTime'] # 1349724919000

How to convert a file into a dictionary?

If you love one liners, try:

d=eval('{'+re.sub('\'[\s]*?\'','\':\'',re.sub(r'([^'+input('SEP: ')+',]+)','\''+r'\1'+'\'',open(input('FILE: ')).read().rstrip('\n').replace('\n',',')))+'}')

Input FILE = Path to file, SEP = Key-Value separator character

Not the most elegant or efficient way of doing it, but quite interesting nonetheless :)

How to create an Excel File with Nodejs?

You should check ExcelJS

Works with CSV and XLSX formats.

Great for reading/writing XLSX streams. I've used it to stream an XLSX download to an Express response object, basically like this:

app.get('/some/route', function(req, res) {
  res.writeHead(200, {
    'Content-Disposition': 'attachment; filename="file.xlsx"',
    'Transfer-Encoding': 'chunked',
    'Content-Type': 'application/vnd.openxmlformats-officedocument.spreadsheetml.sheet'
  })
  var workbook = new Excel.stream.xlsx.WorkbookWriter({ stream: res })
  var worksheet = workbook.addWorksheet('some-worksheet')
  worksheet.addRow(['foo', 'bar']).commit()
  worksheet.commit()
  workbook.commit()
}

Works great for large files, performs much better than excel4node (got huge memory usage & Node process "out of memory" crash after nearly 5 minutes for a file containing 4 million cells in 20 sheets) since its streaming capabilities are much more limited (does not allows to "commit()" data to retrieve chunks as soon as they can be generated)

See also this SO answer.

Regex for 1 or 2 digits, optional non-alphanumeric, 2 known alphas

^[0-9][0-9]?[^A-Za-z0-9]?po$

You can test it here: http://www.regextester.com/

To use this in C#,

Regex r = new Regex(@"^[0-9][0-9]?[^A-Za-z0-9]?po$");
if (r.Match(someText).Success) {
   //Do Something
}

Remember, @ is a useful symbol that means the parser takes the string literally (eg, you don't need to write \\ for one backslash)

Iterate through string array in Java

String current = elements[i];
if (i != elements.length - 1) {
   String next = elements[i+1];
}

This makes sure you don't get an ArrayIndexOutOfBoundsException for the last element (there is no 'next' there). The other option is to iterate to i < elements.length - 1. It depends on your requirements.

Android MediaPlayer Stop and Play

According to the MediaPlayer life cycle, which you can view in the Android API guide, I think that you have to call reset() instead of stop(), and after that prepare again the media player (use only one) to play the sound from the beginning. Take also into account that the sound may have finished. So I would also recommend to implement setOnCompletionListener() to make sure that if you try to play again the sound it doesn't fail.

How to add a JAR in NetBeans

You want to add libraries to your project and in doing so you have two options as you yourself identified:

Compile-time libraries are libraries which is needed to compile your application. They are not included when your application is assembled (e.g., into a war-file). Libraries of this kind must be provided by the container running your project.

This is useful in situation when you want to vary API and implementation, or when the library is supplied by the container (which is typically the case with javax.servlet which is required to compile but provided by the application server, e.g., Apache Tomcat).

Run-time libraries are libraries which is needed both for compilation and when running your project. This is probably what you want in most cases. If for instance your project is packaged into a war/ear, then these libraries will be included in the package.

As for the other alernatives you have either global libraries using Library Manageror jdk libraries. The latter is simply your regular java libraries, while the former is just a way for your to store a set of libraries under a common name. For all your future projects, instead of manually assigning the libraries you can simply select to import them from your Library Manager.

Difference between two dates in years, months, days in JavaScript

Neither of the codes work for me, so I use this instead for months and days:

function monthDiff(d2, d1) {
    var months;
    months = (d2.getFullYear() - d1.getFullYear()) * 12;
    months -= d1.getMonth() + 1;
    months += d2.getMonth() + 1;
    return months <= 0 ? 0 : months;
}

function daysInMonth(date) {
    return new Date(date.getYear(), date.getMonth() + 1, 0).getDate();
}    

function diffDate(date1, date2) {
    if (date2 && date2.getTime() && !isNaN(date2.getTime())) {
        var months = monthDiff(date1, date2);
        var days = 0;

        if (date1.getUTCDate() >= date2.getUTCDate()) {
            days = date1.getUTCDate() - date2.getUTCDate();
        }
        else {
            months--;
            days = date1.getUTCDate() - date2.getUTCDate() + daysInMonth(date2);
        }

        // Use the variables months and days how you need them.
    }
}

Anaconda Installed but Cannot Launch Navigator

What finally worked for me was:

  1. Uninstalling Anaconda
  2. Deleting all files that has "conda" in them - most of them should be located in: C:\Users\Admin
  3. Delete especially the "condarc" file.
  4. Reboot
  5. Installed 32-bit installer (even though my system is 64-bit) and reboot

Finally worked. I have not yet re-tried with 64-bit installer, since I have a time critical project, but will do when again I have spare time.

P.S. what broke Anaconda for me was a blue screen I got while updating Anaconda. I guess it did not clear all old files and this broke the new installs.

Deserialize JSON with Jackson into Polymorphic Types - A Complete Example is giving me a compile error

If using the fasterxml then,

these changes might be needed

import com.fasterxml.jackson.core.JsonParser;
import com.fasterxml.jackson.core.JsonProcessingException;
import com.fasterxml.jackson.core.Version;
import com.fasterxml.jackson.databind.DeserializationContext;
import com.fasterxml.jackson.databind.JsonNode;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.fasterxml.jackson.databind.deser.std.StdDeserializer;
import com.fasterxml.jackson.databind.module.SimpleModule;
import com.fasterxml.jackson.databind.node.ObjectNode;

in main method--

use

SimpleModule module =
  new SimpleModule("PolymorphicAnimalDeserializerModule");

instead of

new SimpleModule("PolymorphicAnimalDeserializerModule",
      new Version(1, 0, 0, null));

and in Animal deserialize() function, make below changes

//Iterator<Entry<String, JsonNode>> elementsIterator =  root.getFields();
Iterator<Entry<String, JsonNode>> elementsIterator = root.fields();

//return mapper.readValue(root, animalClass);
return  mapper.convertValue(root, animalClass); 

This works for fasterxml.jackson. If it still complains of the class fields. Use the same format as in the json for the field names (with "_" -underscore). as this
//mapper.setPropertyNamingStrategy(new CamelCaseNamingStrategy()); might not be supported.

abstract class Animal
{
  public String name;
}

class Dog extends Animal
{
  public String breed;
  public String leash_color;
}

class Cat extends Animal
{
  public String favorite_toy;
}

class Bird extends Animal
{
  public String wing_span;
  public String preferred_food;
}

How to display errors for my MySQLi query?

mysqli_error()

As in:

$sql = "Your SQL statement here";
$result = mysqli_query($conn, $sql) or trigger_error("Query Failed! SQL: $sql - Error: ".mysqli_error($conn), E_USER_ERROR);

Trigger error is better than die because you can use it for development AND production, it's the permanent solution.

php_network_getaddresses: getaddrinfo failed: Name or service not known

Had such a problem (with https://github.com/PHPMailer/PHPMailer), just reload PHP and everything start worked

for Centos 6 and 7:

service php-fpm restart 

Does bootstrap have builtin padding and margin classes?

These spacing notations are quite effective in custom changes. You can also use negative values there too. Official

Though we can use them whenever we want. Bootstrap Spacing

Can I get the name of the currently running function in JavaScript?

Information is actual on 2016 year.


Results for function declaration

Result in the Opera

>>> (function func11 (){
...     console.log(
...         'Function name:',
...         arguments.callee.toString().match(/function\s+([_\w]+)/)[1])
... })();
... 
... (function func12 (){
...     console.log('Function name:', arguments.callee.name)
... })();
Function name:, func11
Function name:, func12

Result in the Chrome

(function func11 (){
    console.log(
        'Function name:',
        arguments.callee.toString().match(/function\s+([_\w]+)/)[1])
})();

(function func12 (){
    console.log('Function name:', arguments.callee.name)
})();
Function name: func11
Function name: func12

Result in the NodeJS

> (function func11 (){
...     console.log(
.....         'Function name:',
.....         arguments.callee.toString().match(/function\s+([_\w]+)/)[1])
... })();
Function name: func11
undefined
> (function func12 (){
...     console.log('Function name:', arguments.callee.name)
... })();
Function name: func12

Does not work in the Firefox. Untested on the IE and the Edge.


Results for function expressions

Result in the NodeJS

> var func11 = function(){
...     console.log('Function name:', arguments.callee.name)
... }; func11();
Function name: func11

Result in the Chrome

var func11 = function(){
    console.log('Function name:', arguments.callee.name)
}; func11();
Function name: func11

Does not work in the Firefox, Opera. Untested on the IE and the Edge.

Notes:

  1. Anonymous function does not to make sense to check.
  2. Testing environment

~ $ google-chrome --version
Google Chrome 53.0.2785.116           
~ $ opera --version
Opera 12.16 Build 1860 for Linux x86_64.
~ $ firefox --version
Mozilla Firefox 49.0
~ $ node
node    nodejs  
~ $ nodejs --version
v6.8.1
~ $ uname -a
Linux wlysenko-Aspire 3.13.0-37-generic #64-Ubuntu SMP Mon Sep 22 21:28:38 UTC 2014 x86_64 x86_64 x86_64 GNU/Linux

Java: how to import a jar file from command line

You could run it without the -jar command line argument if you happen to know the name of the main class you wish to run:

java -classpath .;myjar.jar;lib/referenced-class.jar my.package.MainClass

If perchance you are using linux, you should use ":" instead of ";" in the classpath.

jQuery - trapping tab select event

In later versions of JQuery they have changed the function from select to activate. http://api.jqueryui.com/tabs/#event-activate

Xcode 6.1 Missing required architecture X86_64 in file

Many use the build scripts found either here: http://www.raywenderlich.com/41377/creating-a-static-library-in-ios-tutorial or here: https://gist.github.com/sponno/7228256 for their run script in their target.

I was pulling my hair out trying to add x86_64, i386, armv7s, armv7, and arm64 to the Architectures section, only to find lipo -info targetname.a never returning these architectures after a successful build.

In my case, I had to modify the target runscript, specifically step 1 from the gist link, to manually include the architectures using -arch.

Step 1. Build Device and Simulator versions xcodebuild -target ${PROJECT_NAME} ONLY_ACTIVE_ARCH=NO -configuration ${CONFIGURATION} -sdk iphoneos BUILD_DIR="${BUILD_DIR}" BUILD_ROOT="${BUILD_ROOT}" xcodebuild -target ${PROJECT_NAME} -configuration ${CONFIGURATION} -sdk iphonesimulator -arch x86_64 -arch i386 -arch armv7 -arch armv7s -arch arm64 BUILD_DIR="${BUILD_DIR}" BUILD_ROOT="${BUILD_ROOT}"

Could you explain STA and MTA?

As my understanding, the 'Apartment' is used to protect the COM objects from multi-threading issues.

If a COM object is not thread-safe, it should declare it as a STA object. Then only the thread who creates it can access it. The creation thread should declare itself as a STA thread. Under the hood, the thread stores the STA information in its TLS(Thread Local Storage). We call this behavior as that the thread enters a STA apartment. When other threads want to access this COM object, it should marshal the access to the creation thread. Basically, the creation thread uses messages mechanism to process the in-bound calls.

If a COM object is thread-safe, it should declare it as a MTA object. The MTA object can be accessed by multi-threads.

How to resize array in C++?

You can do smth like this for 1D arrays. Here we use int*& because we want our pointer to be changeable.

#include<algorithm> // for copy

void resize(int*& a, size_t& n)
{
   size_t new_n = 2 * n;
   int* new_a = new int[new_n];
   copy(a, a + n, new_a);
   delete[] a;
   a = new_a;
   n = new_n;
}

For 2D arrays:

#include<algorithm> // for copy

void resize(int**& a, size_t& n)
{
   size_t new_n = 2 * n, i = 0;
   int** new_a = new int* [new_n];
   for (i = 0; i != new_n; ++i)
       new_a[i] = new int[100];
   for (i = 0; i != n; ++i)
   {
       copy(a[i], a[i] + 100, new_a[i]);
       delete[] a[i];
   }
   delete[] a;
   a = new_a;
   n = new_n;
}

Invoking of 1D array:

void myfn(int*& a, size_t& n)
{
   // do smth
   resize(a, n);
}

Invoking of 2D array:

void myfn(int**& a, size_t& n)
{
   // do smth
   resize(a, n);
}
  


   

Visual Studio Code PHP Intelephense Keep Showing Not Necessary Error

To those would prefer to keep it simple, stupid; If you rather get rid of the notices instead of installing a helper or downgrading, simply disable the error in your settings.json by adding this:

"intelephense.diagnostics.undefinedTypes": false

R - Concatenate two dataframes?

You may use rbind but in this case you need to have the same number of columns in both tables, so try the following:

b$b<-as.double(NA) #keeping numeric format is essential for further calculations
new<-rbind(a,b)

How to make a GUI for bash scripts?

Well, if you can use Tcl/Tk in your environment, you probably should write a TCL script and use that. You might also look at wish.

How can I hide a TD tag using inline JavaScript or CSS?

What do you expect to happen in it's place? The table can't reflow to fill the space left - this seems like a recipe for buggy browser responses.

Think about hiding the contents of the td, not the td itself.

Simplest two-way encryption using PHP

Use mcrypt_encrypt() and mcrypt_decrypt() with corresponding parameters. Really easy and straight forward, and you use a battle-tested encryption package.

EDIT

5 years and 4 months after this answer, the mcrypt extension is now in the process of deprecation and eventual removal from PHP.

Set value of textarea in jQuery

This works:

var t = $('#taCommentSalesAdministration');
t.val('Hi');

Remember, the tricky part here is making sure you use the correct ID. And before you use the ID make sure you put # before it.

How do I access an access array item by index in handlebars?

Try this:

<ul id="luke_should_be_here">
{{people.1.name}}
</ul>

Difference between window.location.href=window.location.href and window.location.reload()

The difference is that

window.location = document.URL;

will not reload the page if there is a hash (#) in the URL (with or without something after it), whereas

window.location.reload();

will reload the page.

Automatically deleting related rows in Laravel (Eloquent ORM)

Relation in User model:

public function photos()
{
    return $this->hasMany('Photo');
}

Delete record and related:

$user = User::find($id);

// delete related   
$user->photos()->delete();

$user->delete();

Jasmine JavaScript Testing - toBe vs toEqual

To quote the jasmine github project,

expect(x).toEqual(y); compares objects or primitives x and y and passes if they are equivalent

expect(x).toBe(y); compares objects or primitives x and y and passes if they are the same object

Command to delete all pods in all kubernetes namespaces

Delete all PODs in all Namespace only (restart deployment)

 kubectl get pod -A -o yaml | kubectl delete -f -

Is there a good jQuery Drag-and-drop file upload plugin?

http://blueimp.github.com/jQuery-File-Upload/ = great solution

According to their docs, the following browsers support drag & drop:

  • Firefox 4+
  • Safari 5+
  • Google Chrome
  • Microsoft Internet Explorer 10.0+

CSS3 Transform Skew One Side

Maybe you want to use CSS "clip-path" (Works with transparency and background)

"clip-path" reference: https://developer.mozilla.org/en-US/docs/Web/CSS/clip-path

Generator: http://bennettfeely.com/clippy/

Example:

_x000D_
_x000D_
/* With percent */_x000D_
.element-percent {_x000D_
  background: red;_x000D_
  width: 150px;_x000D_
  height: 48px;_x000D_
  display: inline-block;_x000D_
  _x000D_
  clip-path: polygon(0 0, 100% 0%, 75% 100%, 0% 100%);_x000D_
}_x000D_
_x000D_
/* With pixel */_x000D_
.element-pixel {_x000D_
  background: blue;_x000D_
  width: 150px;_x000D_
  height: 48px;_x000D_
  display: inline-block;_x000D_
  _x000D_
  clip-path: polygon(0 0, 100% 0%, calc(100% - 32px) 100%, 0% 100%);_x000D_
}_x000D_
_x000D_
/* With background */_x000D_
.element-background {_x000D_
  background: url(https://images.pexels.com/photos/170811/pexels-photo-170811.jpeg?auto=compress&cs=tinysrgb&dpr=2&h=750&w=1260) no-repeat center/cover;_x000D_
  width: 150px;_x000D_
  height: 48px;_x000D_
  display: inline-block;_x000D_
  _x000D_
  clip-path: polygon(0 0, 100% 0%, calc(100% - 32px) 100%, 0% 100%);_x000D_
}
_x000D_
<div class="element-percent"></div>_x000D_
_x000D_
<br />_x000D_
_x000D_
<div class="element-pixel"></div>_x000D_
_x000D_
<br />_x000D_
_x000D_
<div class="element-background"></div>
_x000D_
_x000D_
_x000D_

Change the current directory from a Bash script

In light of the unreadability and overcomplication of answers, i believe this is what the requestor should do

  1. add that script to the PATH
  2. run the script as . scriptname

The . (dot) will make sure the script is not run in a child shell.

Change text from "Submit" on input tag

The value attribute is used to determine the rendered label of a submit input.

<input type="submit" class="like" value="Like" />

Note that if the control is successful (this one won't be as it has no name) this will also be the submitted value for it.

To have a different submitted value and label you need to use a button element, in which the textNode inside the element determines the label. You can include other elements (including <img> here).

<button type="submit" class="like" name="foo" value="bar">Like</button>

Note that support for <button> is dodgy in older versions of Internet Explorer.

how to get current datetime in SQL?

I always just use NOW():

INSERT INTO table (lastModifiedTime) VALUES (NOW())

http://dev.mysql.com/doc/refman/5.1/en/date-and-time-functions.html#function_now

Convert boolean to int in Java

import org.apache.commons.lang3.BooleanUtils;
boolean x = true;   
int y= BooleanUtils.toInteger(x);

How can I read and manipulate CSV file data in C++?

Here is some code you can use. The data from the csv is stored inside an array of rows. Each row is an array of strings. Hope this helps.

#include <iostream>
#include <string>
#include <fstream>
#include <sstream>
#include <vector>
typedef std::string String;
typedef std::vector<String> CSVRow;
typedef CSVRow::const_iterator CSVRowCI;
typedef std::vector<CSVRow> CSVDatabase;
typedef CSVDatabase::const_iterator CSVDatabaseCI;
void readCSV(std::istream &input, CSVDatabase &db);
void display(const CSVRow&);
void display(const CSVDatabase&);
int main(){
  std::fstream file("file.csv", std::ios::in);
  if(!file.is_open()){
    std::cout << "File not found!\n";
    return 1;
  }
  CSVDatabase db;
  readCSV(file, db);
  display(db);
}
void readCSV(std::istream &input, CSVDatabase &db){
  String csvLine;
  // read every line from the stream
  while( std::getline(input, csvLine) ){
    std::istringstream csvStream(csvLine);
    CSVRow csvRow;
    String csvCol;
    // read every element from the line that is seperated by commas
    // and put it into the vector or strings
    while( std::getline(csvStream, csvCol, ',') )
      csvRow.push_back(csvCol);
    db.push_back(csvRow);
  }
}
void display(const CSVRow& row){
  if(!row.size())
    return;
  CSVRowCI i=row.begin();
  std::cout<<*(i++);
  for(;i != row.end();++i)
    std::cout<<','<<*i;
}
void display(const CSVDatabase& db){
  if(!db.size())
    return;
  CSVDatabaseCI i=db.begin();
  for(; i != db.end(); ++i){
    display(*i);
    std::cout<<std::endl;
  }
}

mysql query: SELECT DISTINCT column1, GROUP BY column2

Somehow your requirement sounds a bit contradictory ..

group by name (which is basically a distinct on name plus readiness to aggregate) and then a distinct on IP

What do you think should happen if two people (names) worked from the same IP within the time period specified?


Did you try this?

SELECT name, COUNT(name), time, price, ip, SUM(price) 
  FROM tablename 
 WHERE time >= $yesterday AND time <$today 
GROUP BY name,ip

SSH to Elastic Beanstalk instance

Elastic Beanstalk can bind a single EC2 keypair to an instance profile. A manual solution to have multiple users ssh into EBS is to add their public keys in authorized_keys file.

Should you always favor xrange() over range()?

One other difference is that xrange() can't support numbers bigger than C ints, so if you want to have a range using python's built in large number support, you have to use range().

Python 2.7.3 (default, Jul 13 2012, 22:29:01) 
[GCC 4.7.1] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> range(123456787676676767676676,123456787676676767676679)
[123456787676676767676676L, 123456787676676767676677L, 123456787676676767676678L]
>>> xrange(123456787676676767676676,123456787676676767676679)
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
OverflowError: Python int too large to convert to C long

Python 3 does not have this problem:

Python 3.2.3 (default, Jul 14 2012, 01:01:48) 
[GCC 4.7.1] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> range(123456787676676767676676,123456787676676767676679)
range(123456787676676767676676, 123456787676676767676679)

Understanding ibeacon distancing

The iBeacon output power is measured (calibrated) at a distance of 1 meter. Let's suppose that this is -59 dBm (just an example). The iBeacon will include this number as part of its LE advertisment.

The listening device (iPhone, etc), will measure the RSSI of the device. Let's suppose, for example, that this is, say, -72 dBm.

Since these numbers are in dBm, the ratio of the power is actually the difference in dB. So:

ratio_dB = txCalibratedPower - RSSI

To convert that into a linear ratio, we use the standard formula for dB:

ratio_linear = 10 ^ (ratio_dB / 10)

If we assume conservation of energy, then the signal strength must fall off as 1/r^2. So:

power = power_at_1_meter / r^2. Solving for r, we get:

r = sqrt(ratio_linear)

In Javascript, the code would look like this:

function getRange(txCalibratedPower, rssi) {
    var ratio_db = txCalibratedPower - rssi;
    var ratio_linear = Math.pow(10, ratio_db / 10);

    var r = Math.sqrt(ratio_linear);
    return r;
}

Note, that, if you're inside a steel building, then perhaps there will be internal reflections that make the signal decay slower than 1/r^2. If the signal passes through a human body (water) then the signal will be attenuated. It's very likely that the antenna doesn't have equal gain in all directions. Metal objects in the room may create strange interference patterns. Etc, etc... YMMV.

Can a Windows batch file determine its own file name?

Try to run below example in order to feel how the magical variables work.

@echo off

SETLOCAL EnableDelayedExpansion

echo Full path and filename: %~f0
echo Drive: %~d0
echo Path: %~p0
echo Drive and path: %~dp0
echo Filename without extension: %~n0
echo Filename with    extension: %~nx0
echo Extension: %~x0

echo date time : %~t0
echo file size: %~z0

ENDLOCAL

The related rules are following.

%~I         - expands %I removing any surrounding quotes ("")
%~fI        - expands %I to a fully qualified path name
%~dI        - expands %I to a drive letter only
%~pI        - expands %I to a path only
%~nI        - expands %I to a file name only
%~xI        - expands %I to a file extension only
%~sI        - expanded path contains short names only
%~aI        - expands %I to file attributes of file
%~tI        - expands %I to date/time of file
%~zI        - expands %I to size of file
%~$PATH:I   - searches the directories listed in the PATH
               environment variable and expands %I to the
               fully qualified name of the first one found.
               If the environment variable name is not
               defined or the file is not found by the
               search, then this modifier expands to the
               empty string

Nested select statement in SQL Server

The answer provided by Joe Stefanelli is already correct.

SELECT name FROM (SELECT name FROM agentinformation) as a  

We need to make an alias of the subquery because a query needs a table object which we will get from making an alias for the subquery. Conceptually, the subquery results are substituted into the outer query. As we need a table object in the outer query, we need to make an alias of the inner query.

Statements that include a subquery usually take one of these forms:

  • WHERE expression [NOT] IN (subquery)
  • WHERE expression comparison_operator [ANY | ALL] (subquery)
  • WHERE [NOT] EXISTS (subquery)

Check for more subquery rules and subquery types.

More examples of Nested Subqueries.

  1. IN / NOT IN – This operator takes the output of the inner query after the inner query gets executed which can be zero or more values and sends it to the outer query. The outer query then fetches all the matching [IN operator] or non matching [NOT IN operator] rows.

  2. ANY – [>ANY or ANY operator takes the list of values produced by the inner query and fetches all the values which are greater than the minimum value of the list. The

e.g. >ANY(100,200,300), the ANY operator will fetch all the values greater than 100.

  1. ALL – [>ALL or ALL operator takes the list of values produced by the inner query and fetches all the values which are greater than the maximum of the list. The

e.g. >ALL(100,200,300), the ALL operator will fetch all the values greater than 300.

  1. EXISTS – The EXISTS keyword produces a Boolean value [TRUE/FALSE]. This EXISTS checks the existence of the rows returned by the sub query.

What processes are using which ports on unix?

netstat -pln

EDIT: linux only, on other UNIXes netstat may not support all these options.

get current date with 'yyyy-MM-dd' format in Angular 4

In Controller ,

 var DateObj = new Date();

 $scope.YourParam = DateObj.getFullYear() + '-' + ('0' + (DateObj.getMonth() + 1)).slice(-2) + '-' + ('0' + DateObj.getDate()).slice(-2);

Count unique values using pandas groupby

I know it has been a while since this was posted, but I think this will help too. I wanted to count unique values and filter the groups by number of these unique values, this is how I did it:

df.groupby('group').agg(['min','max','count','nunique']).reset_index(drop=False)

Check if any ancestor has a class using jQuery

There are many ways to filter for element ancestors.

if ($elem.closest('.parentClass').length /* > 0*/) {/*...*/}
if ($elem.parents('.parentClass').length /* > 0*/) {/*...*/}
if ($elem.parents().hasClass('parentClass')) {/*...*/}
if ($('.parentClass').has($elem).length /* > 0*/) {/*...*/}
if ($elem.is('.parentClass *')) {/*...*/} 

Beware, closest() method includes element itself while checking for selector.

Alternatively, if you have a unique selector matching the $elem, e.g #myElem, you can use:

if ($('.parentClass:has(#myElem)').length /* > 0*/) {/*...*/}
if(document.querySelector('.parentClass #myElem')) {/*...*/}

If you want to match an element depending any of its ancestor class for styling purpose only, just use a CSS rule:

.parentClass #myElem { /* CSS property set */ }

Javascript how to split newline

Here is example with console.log instead of alert(). It is more convenient :)

var parse = function(){
  var str = $('textarea').val();
  var results = str.split("\n");
  $.each(results, function(index, element){
    console.log(element);
  });
};

$(function(){
  $('button').on('click', parse);
});

You can try it here

.Net: How do I find the .NET version?

MSDN details it here very nicely on how to check it from registry:

To find .NET Framework versions by viewing the registry (.NET Framework 1-4)

  1. On the Start menu, choose Run.
  2. In the Open box, enter regedit.exe.You must have administrative credentials to run regedit.exe.
  3. In the Registry Editor, open the following subkey:

    HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\NET Framework Setup\NDP

The installed versions are listed under the NDP subkey. The version number is stored in the Version entry. For the .NET Framework 4 the Version entry is under the Client or Full subkey (under NDP), or under both subkeys.

To find .NET Framework versions by viewing the registry (.NET Framework 4.5 and later)

  1. On the Start menu, choose Run.
  2. In the Open box, enter regedit.exe. You must have administrative credentials to run regedit.exe.
  3. In the Registry Editor, open the following subkey:

    HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\NET Framework Setup\NDP\v4\Full

Note that the path to the Full subkey includes the subkey Net Framework rather than .NET Framework

Check for a DWORD value named Release. The existence of the Release DWORD indicates that the .NET Framework 4.5 or newer has been installed on that computer.

enter image description here

Note: The last row in the above snapshot which got clipped reads On all other OS versions: 461310. I tried my level best to avoid the information getting clipped while taking the screenshot but the table was way too big.

Reset all changes after last commit in git

First, reset any changes

This will undo any changes you've made to tracked files and restore deleted files:

git reset HEAD --hard

Second, remove new files

This will delete any new files that were added since the last commit:

git clean -fd

Files that are not tracked due to .gitignore are preserved; they will not be removed

Warning: using -x instead of -fd would delete ignored files. You probably don't want to do this.

Best way to verify string is empty or null

Optional.ofNullable(label)
.map(String::trim)
.map(string -> !label.isEmpty)
.orElse(false)

OR

TextUtils.isNotBlank(label);

the last solution will check if not null and trimm the str at the same time

how to concat two columns into one with the existing column name in mysql?

As aziz-shaikh has pointed out, there is no way to suppress an individual column from the * directive, however you might be able to use the following hack:

SELECT CONCAT(c.FIRSTNAME, ',', c.LASTNAME) AS FIRSTNAME,
       c.*
FROM   `customer` c;

Doing this will cause the second occurrence of the FIRSTNAME column to adopt the alias FIRSTNAME_1 so you should be able to safely address your customised FIRSTNAME column. You need to alias the table because * in any position other than at the start will fail if not aliased.

Hope that helps!

How to beautifully update a JPA entity in Spring Data?

Simple JPA update..

Customer customer = em.find(id, Customer.class); //Consider em as JPA EntityManager
customer.setName(customerDto.getName);
em.merge(customer);

What is recursion and when should I use it?

There are a number of good explanations of recursion in this thread, this answer is about why you shouldn't use it in most languages.* In the majority of major imperative language implementations (i.e. every major implementation of C, C++, Basic, Python, Ruby,Java, and C#) iteration is vastly preferable to recursion.

To see why, walk through the steps that the above languages use to call a function:

  1. space is carved out on the stack for the function's arguments and local variables
  2. the function's arguments are copied into this new space
  3. control jumps to the function
  4. the function's code runs
  5. the function's result is copied into a return value
  6. the stack is rewound to its previous position
  7. control jumps back to where the function was called

Doing all of these steps takes time, usually a little bit more than it takes to iterate through a loop. However, the real problem is in step #1. When many programs start, they allocate a single chunk of memory for their stack, and when they run out of that memory (often, but not always due to recursion), the program crashes due to a stack overflow.

So in these languages recursion is slower and it makes you vulnerable to crashing. There are still some arguments for using it though. In general, code written recursively is shorter and a bit more elegant, once you know how to read it.

There is a technique that language implementers can use called tail call optimization which can eliminate some classes of stack overflow. Put succinctly: if a function's return expression is simply the result of a function call, then you don't need to add a new level onto the stack, you can reuse the current one for the function being called. Regrettably, few imperative language-implementations have tail-call optimization built in.

* I love recursion. My favorite static language doesn't use loops at all, recursion is the only way to do something repeatedly. I just don't think that recursion is generally a good idea in languages that aren't tuned for it.

** By the way Mario, the typical name for your ArrangeString function is "join", and I'd be surprised if your language of choice doesn't already have an implementation of it.

Disable XML validation in Eclipse

Window > Preferences > Validation > uncheck XML Validator Manual and Build enter image description here

How do I check in python if an element of a list is empty?

If you want to know if list element at index i is set or not, you can simply check the following:

if len(l)<=i:
    print ("empty")

If you are looking for something like what is a NULL-Pointer or a NULL-Reference in other languages, Python offers you None. That is you can write:

l[0] = None # here, list element at index 0 has to be set already
l.append(None) # here the list can be empty before
# checking
if l[i] == None:
    print ("list has actually an element at position i, which is None")

Photoshop text tool adds punctuation to the beginning of text

This is a paragraph option. Go to Window>Paragraph then a small window will pop up. You will have two buttons on the bottom. One with a arrow on the left of P and one on the right. Select the right one.

How can I get terminal output in python?

The easiest way is to use the library commands

import commands
print commands.getstatusoutput('echo "test" | wc')

Generating a SHA-256 hash from the Linux command line

If the command sha256sum is not available (on Mac OS X v10.9 (Mavericks) for example), you can use:

echo -n "foobar" | shasum -a 256

How to return a part of an array in Ruby?

another way is to use the range method

foo = [1,2,3,4,5,6]
bar = [10,20,30,40,50,60]
a = foo[0...3]
b = bar[3...6]

print a + b 
=> [1, 2, 3, 40, 50 , 60]

jQuery function to open link in new window

http://www.jquerybyexample.net/2012/05/open-link-in-new-tab-or-new-popup.html

$(document).ready(function() {
$('A.BLAH').click(function() {
var NWin = window.open($(this).prop('href'), '', 'height=600,width=1000');
if (window.focus)
{
NWin.focus();
}
return false;
});
});

Why is 2 * (i * i) faster than 2 * i * i in Java?

(Editor's note: this answer is contradicted by evidence from looking at the asm, as shown by another answer. This was a guess backed up by some experiments, but it turned out not to be correct.)


When the multiplication is 2 * (i * i), the JVM is able to factor out the multiplication by 2 from the loop, resulting in this equivalent but more efficient code:

int n = 0;
for (int i = 0; i < 1000000000; i++) {
    n += i * i;
}
n *= 2;

but when the multiplication is (2 * i) * i, the JVM doesn't optimize it since the multiplication by a constant is no longer right before the n += addition.

Here are a few reasons why I think this is the case:

  • Adding an if (n == 0) n = 1 statement at the start of the loop results in both versions being as efficient, since factoring out the multiplication no longer guarantees that the result will be the same
  • The optimized version (by factoring out the multiplication by 2) is exactly as fast as the 2 * (i * i) version

Here is the test code that I used to draw these conclusions:

public static void main(String[] args) {
    long fastVersion = 0;
    long slowVersion = 0;
    long optimizedVersion = 0;
    long modifiedFastVersion = 0;
    long modifiedSlowVersion = 0;

    for (int i = 0; i < 10; i++) {
        fastVersion += fastVersion();
        slowVersion += slowVersion();
        optimizedVersion += optimizedVersion();
        modifiedFastVersion += modifiedFastVersion();
        modifiedSlowVersion += modifiedSlowVersion();
    }

    System.out.println("Fast version: " + (double) fastVersion / 1000000000 + " s");
    System.out.println("Slow version: " + (double) slowVersion / 1000000000 + " s");
    System.out.println("Optimized version: " + (double) optimizedVersion / 1000000000 + " s");
    System.out.println("Modified fast version: " + (double) modifiedFastVersion / 1000000000 + " s");
    System.out.println("Modified slow version: " + (double) modifiedSlowVersion / 1000000000 + " s");
}

private static long fastVersion() {
    long startTime = System.nanoTime();
    int n = 0;
    for (int i = 0; i < 1000000000; i++) {
        n += 2 * (i * i);
    }
    return System.nanoTime() - startTime;
}

private static long slowVersion() {
    long startTime = System.nanoTime();
    int n = 0;
    for (int i = 0; i < 1000000000; i++) {
        n += 2 * i * i;
    }
    return System.nanoTime() - startTime;
}

private static long optimizedVersion() {
    long startTime = System.nanoTime();
    int n = 0;
    for (int i = 0; i < 1000000000; i++) {
        n += i * i;
    }
    n *= 2;
    return System.nanoTime() - startTime;
}

private static long modifiedFastVersion() {
    long startTime = System.nanoTime();
    int n = 0;
    for (int i = 0; i < 1000000000; i++) {
        if (n == 0) n = 1;
        n += 2 * (i * i);
    }
    return System.nanoTime() - startTime;
}

private static long modifiedSlowVersion() {
    long startTime = System.nanoTime();
    int n = 0;
    for (int i = 0; i < 1000000000; i++) {
        if (n == 0) n = 1;
        n += 2 * i * i;
    }
    return System.nanoTime() - startTime;
}

And here are the results:

Fast version: 5.7274411 s
Slow version: 7.6190804 s
Optimized version: 5.1348007 s
Modified fast version: 7.1492705 s
Modified slow version: 7.2952668 s

Mount current directory as a volume in Docker on Windows 10

docker run --rm -v /c/Users/Christian/manager/bin:/app --workdir=/app  php:7.2-cli php  app.php

Git bash

 cd /c/Users/Christian/manager
    docker run --rm -v  ${PWD}:/app  --workdir=/app  php:7.2-cli php  bin/app.php

echo ${PWD} result:

/c/Users/Christian/manager

cmd or PowerShell

  cd C:\Users\Christian\manager

echo ${PWD} result:

Path ---- C:\Users\Christian\manager

as we see in cmd or PowerShell $ {PWD} will not work

How to control the line spacing in UILabel

As a quick-dirty-smart-simple workaround:

For UILabels that don't have much lines you can instead use stackViews.

  1. For each line write a new label.
  2. Embed them into a StackView.(select both labels-->Editor-->Embed In -->StackView
  3. Adjust the Spacing of the StackView to your desired amount

Be sure to stack them vertically. This solution also works for custom fonts.

enter image description here

Difference between the System.Array.CopyTo() and System.Array.Clone()

One other difference not mentioned so far is that

  • with Clone() the destination array need not exist yet since a new one is created from scratch.
  • with CopyTo() not only does the destination array need to already exist, it needs to be large enough to hold all the elements in the source array from the index you specify as the destination.

How do I print the percent sign(%) in c

Your problem is that you have to change:

printf("%"); 

to

printf("%%");

Or you could use ASCII code and write:

printf("%c", 37);

:)

Javascript getElementById based on a partial string

You can use the querySelector for that:

document.querySelector('[id^="poll-"]').id;

The selector means: get an element where the attribute [id] begins with the string "poll-".

^ matches the start
* matches any position
$ matches the end

jsfiddle

HttpGet with HTTPS : SSLPeerUnverifiedException

Your local JVM or remote server may not have the required ciphers. go here

https://www.oracle.com/java/technologies/javase-jce8-downloads.html

and download the zip file that contains: US_export_policy.jar and local_policy.jar

replace the existing files (you need to find the existing path in your JVM).

on a Mac, my path was here. /Library/Java/JavaVirtualMachines/jdk1.8.0_131.jdk/Contents/Home/jre/lib/security

this worked for me.

'module' object is not callable - calling method in another file

The problem is in the import line. You are importing a module, not a class. Assuming your file is named other_file.py (unlike java, again, there is no such rule as "one class, one file"):

from other_file import findTheRange

if your file is named findTheRange too, following java's convenions, then you should write

from findTheRange import findTheRange

you can also import it just like you did with random:

import findTheRange
operator = findTheRange.findTheRange()

Some other comments:

a) @Daniel Roseman is right. You do not need classes here at all. Python encourages procedural programming (when it fits, of course)

b) You can build the list directly:

  randomList = [random.randint(0, 100) for i in range(5)]

c) You can call methods in the same way you do in java:

largestInList = operator.findLargest(randomList)
smallestInList = operator.findSmallest(randomList)

d) You can use built in function, and the huge python library:

largestInList = max(randomList)
smallestInList = min(randomList)

e) If you still want to use a class, and you don't need self, you can use @staticmethod:

class findTheRange():
    @staticmethod
    def findLargest(_list):
        #stuff...

Changing width property of a :before css selector using JQuery

As Boltclock states in his answer to Selecting and manipulating CSS pseudo-elements such as ::before and ::after using jQuery

Although they are rendered by browsers through CSS as if they were like other real DOM elements, pseudo-elements themselves are not part of the DOM, and thus you can't select and manipulate them with jQuery.

Might just be best to set the style with jQuery instead of using the pseudo CSS selector.

chrome : how to turn off user agent stylesheet settings?

https://developers.google.com/chrome-developer-tools/docs/settings

  1. Open Chrome dev tools
  2. Click gear icon on bottom right
  3. In General section, check or uncheck "Show user agent styles".

Updating version numbers of modules in a multi-module Maven project

The best way is, since you intend to bundle your modules together, you can specify <dependencyManagement> tag in outer most pom.xml (parent module) direct under <project> tag. It controls the version and group name. In your individual module, you just need to specify the <artifactId> tag in your pom.xml. It will take the version from parent file.

Make ABC Ordered List Items Have Bold Style

You could do something like this also:

<ol type="A" style="font-weight: bold;">

<li style="padding-bottom: 8px;">****</li>

It is simple code for the beginners.

This code is been tested in "Mozilla, chrome and edge..

GIT commit as different user without email / or only email

The minimal required author format, as hinted to in this SO answer, is

Name <email>

In your case, this means you want to write

git commit --author="Name <email>" -m "whatever"

Per Willem D'Haeseleer's comment, if you don't have an email address, you can use <>:

git commit --author="Name <>" -m "whatever"

As written on the git commit man page that you linked to, if you supply anything less than that, it's used as a search token to search through previous commits, looking for other commits by that author.

zsh compinit: insecure directories

On macOS Sierra you need to run: sudo chown -R $(whoami):staff /usr/local

Magento How to debug blank white screen

It can also be when you don't have a proper php extension loaded. I would double check that you have all of the required php extensions loaded on your system if it isn't the memory limit issue.

NSString property: copy or retain?

For attributes whose type is an immutable value class that conforms to the NSCopying protocol, you almost always should specify copy in your @property declaration. Specifying retain is something you almost never want in such a situation.

Here's why you want to do that:

NSMutableString *someName = [NSMutableString stringWithString:@"Chris"];

Person *p = [[[Person alloc] init] autorelease];
p.name = someName;

[someName setString:@"Debajit"];

The current value of the Person.name property will be different depending on whether the property is declared retain or copy — it will be @"Debajit" if the property is marked retain, but @"Chris" if the property is marked copy.

Since in almost all cases you want to prevent mutating an object's attributes behind its back, you should mark the properties representing them copy. (And if you write the setter yourself instead of using @synthesize you should remember to actually use copy instead of retain in it.)

Getting indices of True values in a boolean list

Use dictionary comprehension way,

x = {k:v for k,v in enumerate(states) if v == True}

Input:

states = [False, False, False, False, True, True, False, True, False, False, False, False, False, False, False, False]

Output:

{4: True, 5: True, 7: True}