The nullish coalescing operator (??) in JavaScript only considers null or undefined as "nullish" values. If the left-hand side is any other value, even falsy values like "" (empty string), 0, or …

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 …

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 …

Jan 16, 2010 · Find solutions to close a browser tab using JavaScript on Stack Overflow. Explore methods and limitations for different browsers.

Mar 29, 2022 · 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.

Mar 7, 2016 · What does $ {} (dollar sign and curly braces) mean in a string in JavaScript? Asked 9 years, 4 months ago Modified 1 year, 7 months ago Viewed 418k times

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...

Mar 2, 2010 · How to use OR condition in a JavaScript IF statement? Asked 15 years, 5 months ago Modified 2 years, 6 months ago Viewed 874k times

In JavaScript there are 7 primitive types: undefined, null, boolean, string, number, bigint and symbol. Everything else is an object. The primitive types boolean, string and number can be …

As of JULY 2018, this has been implemented in almost all major browsers, if you need to support an older browser a polyfill is available. Edit: Note that this returns false if the item in the array …