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 …
Which equals operator (== vs ===) should be used in JavaScript ...
Dec 11, 2008 · Reference: JavaScript Tutorial: Comparison Operators. The == operator will compare for equality after doing any necessary type conversions. The === operator will not do …
What does the !! operator do in JavaScript? - Stack Overflow
Objects are true, but the undefined value and null are both false. The double negation operator !! calculates the truth value of a value. It's actually two operators, where !!x means !(!x), and …
When should I use ?? (nullish coalescing) vs || (logical OR)?
In short, when you care that let a variable assigned from a possible null undefined source, and you wish to provide a default value to the variable, use the nullish coalescing operator ??. If …
What does ${} (dollar sign and curly braces) mean in a string in ...
Mar 7, 2016 · Functionally, it looks like it allows you to nest a variable inside a string without doing concatenation using the + operator. I'm looking for documentation on this feature. Example: …
What is the difference between != and !== operators in JavaScript?
Dec 11, 2009 · Yes, it's the same operator like ===, just for in equality: !== - returns true if the two operands are not identical. This operator will not convert the operands types, and only returns …
How to use OR condition in a JavaScript IF statement?
Mar 2, 2010 · In JavaScript, if you're looking for A or B, but not both, you'll need to do something similar to:
What is the purpose of the dollar sign in JavaScript?
Mar 29, 2022 · 1. "Using the dollar sign is not very common in JavaScript, but professional programmers often use it as an alias for the main function in a JavaScript library. In the …
javascript - How to create an array containing 1...N - Stack Overflow
There is no built-in way to do this in Javascript, but it's a perfectly valid utility function to create if you need to do it more than once. Edit: In my opinion, the following is a better range function. …
String interpolation in JavaScript? - Stack Overflow
Jul 20, 2014 · Since ES6, if you want to do string interpolation in object keys, you will get a SyntaxError: expected property name, got '${' if you do something like: let age = 3. let obj = { …