javascript - When should I use ?? (nullish coalescing) vs || (logical ...
) 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 false , it will not use the right-hand side:
How do you use the ? : (conditional) operator in JavaScript?
Jun 7, 2011 · It's a little hard to google when all you have are symbols ;) The terms to use are "JavaScript conditional operator". If you see any more funny symbols in JavaScript, you should …
What does the !! (double exclamation mark) operator do in …
Because JavaScript has what are called "truthy" and "falsy" values, there are expressions that when evaluated in other expressions will result in a true or false condition, even though the …
What is the purpose of the dollar sign in JavaScript?
Mar 29, 2022 · Unlike many similar languages, identifiers (such as functional and variable names) in Javascript can contain not only letters, numbers and underscores, but can also contain …
Which equals operator (== vs ===) should be used in JavaScript ...
Dec 11, 2008 · JavaScript has two sets of equality operators: === and !==, and their evil twins == and !=. The good ones work the way you would expect. The good ones work the way you …
What does ${} (dollar sign and curly braces) mean in a string in ...
Mar 7, 2016 · I haven't seen anything here or on MDN. I'm sure I'm just missing something. There's got to be some documentation on this somewhere.
Usage of the backtick character (`) in JavaScript - Stack Overflow
Dec 28, 2014 · Backticks in JavaScript is a feature which is introduced in ECMAScript 6 // ECMAScript 2015 for making easy dynamic strings. This ECMAScript 6 feature is also named …
javascript - What does [object Object] mean? - Stack Overflow
In JavaScript there are 7 primitive types: undefined, null, boolean, string, number, bigint and symbol. Everything else is an object. Everything else is an object. The primitive types boolean …
What does "javascript:void(0)" mean? - Stack Overflow
Aug 18, 2009 · In addition to the technical answer, javascript:void means the author is Doing It Wrong. There is no good reason to use a javascript: pseudo-URL(*). In practice it will cause …
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 …