How do I check for null values in JavaScript? - Stack Overflow
Jan 4, 2024 · AFAIK in JAVASCRIPT when a variable is declared but has not assigned value, its type is undefined. so we can check variable even if it would be an object holding some …
How can I check for "undefined" in JavaScript? - Stack Overflow
@JamiePate: Just to be clear, I disagree that 'xyz' in window is a better answer than typeof xyz == "undefined" because it is testing the wrong thing. The in operator checks for the existence of a …
What is the correct way to check for string equality in JavaScript ...
Aug 27, 2010 · There are actually two ways in which strings can be made in javascript. var str = 'Javascript'; This creates a primitive string value. var obj = new String('Javascript'); This …
JavaScript unit test tools for TDD - Stack Overflow
Nov 19, 2008 · QUnit focuses on testing JavaScript in the browser while providing as much convenience to the developer as possible. Blurb from the site: QUnit is a powerful, easy-to-use …
How do you performance test JavaScript code? - Stack Overflow
Sep 21, 2008 · If the reader doesn't know the difference between benchmark, workload and profilers, first read some performance testing foundations on the "readme 1st" section of …
javascript - What is the `it()` function here doing? - Stack Overflow
The it() function is defined by the jasmine testing framework, it is not part of angular per se. You'll see it in angular's documentation because they are encouraging you (for good reason) to get …
How to check for an undefined or null variable in JavaScript?
JavaScript has all sorts of implicit conversions to trip you up, and two different types of equality comparator: == and ===. A function, test(val) that tests for null or undefined should have the …
How can I unit test non-exported functions? - Stack Overflow
Oct 3, 2020 · @IgorSoloydenko On the contrary. I came to that conclusion for 100% pragmatic reasons. The reason testing non-exported function is unpragmatic is that refactoring will cause …
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, …
Javascript Testing With Unique ID's - Stack Overflow
I am kinda new to testing javascript and I was wondering what is the best way to go about testing something where a unique ID is generated. EDIT: I don't really want to test the ID I want to …