How to quickly test some javascript code? - Stack Overflow
Dec 4, 2014 · What would be a good way to test Javascript on a browser? Should there be a localhost in my computer? and how to create one?
How can I check for "undefined" in JavaScript? - Stack Overflow
Detecting an undefined object property (49 answers) How to check a not-defined variable in JavaScript (15 answers) How to handle 'undefined' in JavaScript [duplicate] (3 answers) How …
How do I check for an empty/undefined/null string in JavaScript?
As many know, (0 == "") is true in JavaScript, but since 0 is a value and not empty or null, you may want to test for it. The following two functions return true only for undefined, null, …
How do you performance test JavaScript code? - Stack Overflow
Sep 21, 2008 · I usually just test javascript performance, how long script runs. jQuery Lover gave a good article link for testing javascript code performance, but the article only shows how to …
How do I test a single file using Jest? - Stack Overflow
Feb 26, 2015 · npm test -- bar.spec.js In 2015: In order to run a specific test, you'll need to use the jest command. npm test will not work. To access jest directly on the command line, install it …
How can I check if a string is a valid number? - Stack Overflow
In JavaScript, it's not always as straightforward as it should be to reliably check if a value is a number. It's common for devs to use +, -, or Number () to cast a string value to a number (for …
Does a javascript if statement with multiple conditions test all of ...
In javascript, when using an if statement with multiple conditions to test for, does javascript test them all regardless, or will it bail before testing them all if it's already false? For exampl...
How do I run a single test using Jest? - Stack Overflow
I have a test 'works with nested children' within the file fix-order-test.js. Running the below runs all the tests in the file. jest fix-order-test How do I run only a single test? The below does...
node.js - Run JavaScript in Visual Studio Code - Stack Overflow
Aug 3, 2015 · Is there a way to execute JavaScript and display the results using Visual Studio Code? For example, a script file containing: console.log('hello world'); I assume that Node.js …
javascript - How to run a single test with Mocha? - Stack Overflow
May 31, 2012 · I use Mocha to test my JavaScript stuff. My test file contains 5 tests. Is that possible to run a specific test (or set of tests) rather than all the tests in the file?