
What does the !! (double exclamation mark) operator do in …
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 …
JavaScript comparison operators: Identity vs. Equality
Aug 9, 2016 · I've been trying to understand the difference between JavaScript's comparison operators: identity and equality. From what I've read, if you check the equality of two objects …
Is there a "null coalescing" operator in JavaScript?
Jan 25, 2009 · JavaScript now supports the nullish coalescing operator (??). It returns its right-hand-side operand when its left-hand-side operand is null or undefined, and otherwise returns …
Which equals operator (== vs ===) should be used in JavaScript ...
Dec 11, 2008 · The strict equality operator (===) behaves identically to the abstract equality operator (==) except no type conversion is done, and the types must be the same to be …
What is the difference between != and !== operators in JavaScript?
Dec 11, 2009 · What is the difference between the !== operator and the != operator in JavaScript? Does it behave similarly to the === operator where it compares both value and type?
What's the difference between & and && in JavaScript?
You use logical (boolean) operators. They do different (although similar) things, expect different inputs, produce different outputs, and have different operator precedence.
comparison operators - Difference between == and === in …
Feb 7, 2009 · 1210 === and !== are strict comparison operators: JavaScript has both strict and type-converting equality comparison. For strict equality the objects being compared must have …
When should I use ?? (nullish coalescing) vs || (logical OR)?
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 …
How do you use the ? : (conditional) operator in JavaScript?
Jun 7, 2011 · 27 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 …
operators - What's the difference between = and == in JavaScript ...
Jun 24, 2019 · The very widely known book JavaScript: The Definitive Guide uses the term "Identity operators". it probably originated here (or at least became much more common).