Which equals operator (== vs ===) should be used in JavaScript ...
Dec 11, 2008 · I'm using JSLint to go through JavaScript, and it's returning many suggestions to replace == (two equals signs) with === (three equals signs) when doing things like comparing …
What does the !! (double exclamation mark) operator do in JavaScript ...
Novice JavaScript developers need to know that the "not not" operator is using implicitly the original loose comparison method instead of the exact === or !== operators and also the hidden cast …
What is the purpose of the dollar sign in JavaScript?
Javascript does have types; and in any case, how is the dollar sign even related to that? It's just a character that happens to be a legal identifier in Javascript.
javascript - When should I use ?? (nullish coalescing) vs || (logical ...
Related to Is there a "null coalescing" operator in JavaScript? - JavaScript now has a ?? operator which I see in use more frequently. Previously most JavaScript code used ||. let userAge =
Why would a JavaScript variable start with a dollar sign?
A valid JavaScript identifier shuold must start with a letter, underscore (_), or dollar sign ($); subsequent characters can also be digits (0-9). Because JavaScript is case sensitive, letters include the …
What is the correct way to check for string equality in JavaScript ...
In all other cases, you're safe to use ==. Not only is it safe, but in many cases it simplifies your code in a way that improves readability. I still recommend Crockford's talk for developers who don't want to …
javascript - Get the last item in an array - Stack Overflow
var linkElement = document.getElementById("BackButton"); var loc_array = document.location.href.split('/'); var newT = …
JavaScript hide/show element - Stack Overflow
Learn how to use JavaScript to hide or show elements on a webpage effectively.
How do I replace all occurrences of a string? - Stack Overflow
Note: In general, extending the built-in prototypes in JavaScript is generally not recommended. I am providing as extensions on the String prototype simply for purposes of illustration, showing different …
javascript - Wait 5 seconds before executing next line - Stack Overflow
This function below doesn’t work like I want it to; being a JS novice I can’t figure out why. I need it to wait 5 seconds before checking whether the newState is -1. Currently, it doesn’t wait, i...