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Get all non-unique values (i.e.: duplicate/more than one occurrence) in an array
... a more compact version of the same code. Using some ES6 tricks and higher order functions:
const names = ['Mike', 'Matt', 'Nancy', 'Adam', 'Jenny', 'Nancy', 'Carl']
const count = names =>
names.reduce((a, b) => ({ ...a,
[b]: (a[b] || 0) + 1
}), {}) // don't forget to initia...
how can you easily check if access is denied for a file in .NET?
...hat Dropbox is continually reading and writing files in the background, in order to sync them.
Guess where my Visual Studio Projects folder is located? Inside the "My Dropbox" folder of course.
Therefore as I ran my application in Debug mode, the files it was reading and writing were also con...
Android Studio: Plugin with id 'android-library' not found
...ready mentioned by some of the other answers, you need the gradle tools in order to use it. Using 3.0.1, you have to use the google repo, not mavenCentral or jcenter:
buildscript {
repositories {
...
//In IntelliJ or older versions of Android Studio
//maven {
// ...
Comparator.reversed() does not compile using lambda
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This is a weakness in the compiler's type inferencing mechanism. In order to infer the type of u in the lambda, the target type for the lambda needs to be established. This is accomplished as follows. userList.sort() is expecting an argument of type Comparator<User>. In the first line, ...
What is “(program)” in Chrome debugger’s profiler?
...ostly function, you need to hunt inside it for what could be optimized. In order to do that, you need to know how the time is subdivided among the lines of code in the function. If you had cost on a line of code basis, it would take you directly to those lines.
I don't know if you will be able to g...
How do you implement a Stack and a Queue in JavaScript?
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To avoid needing to iterate over the entire thing in order to append to the end, store a reference to the last one via this.last=node;
– Perkins
Apr 17 '15 at 4:56
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How to show math equations in general github's markdown(not github's blog)
...bc=White&fc=Black&im=jpg&fs=12&ff=arev&edit=
Note: In order for the image to be properly displayed, you'll have to ensure the querystring part of the url is percent encoded. You can easily find online tools to help you with that task, such as www.url-encode-decode.com
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HTML for the Pause symbol in audio and video control
... without BOM (which in most development environments is set by default) in order to instruct the parser how to transform the bytes into characters correctly. <meta charset="utf-8"/> should be used immediately after <head> in a HTML file, and make sure the correct HTTP headers Content-Ty...
Alternative to iFrames with HTML5
...owing is an example of PHP code you can include at the top of your page in order to send these headers to clients:
<?php
header('Access-Control-Allow-Origin: http://api.google.com');
header('Access-Control-Allow-Origin: http://some.example.com');
?>
...
Is there a quick way to delete a file from a Jar / war without having to extract the jar and recreat
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In case you want to delete file in order to unsign signed jar, you can probably just make the .RSA file zero-sized. This can be accomplished with just jar u. See https://stackoverflow.com/a/24678645/653539 . (Worked for me, though I admit it's hack.)
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