What's the meaning of "=>" (a fat arrow formed from equal and …
Jun 20, 2017 · JavaScript arrow functions are roughly the equivalent of lambda functions in python or blocks in Ruby. These are anonymous functions with their own special syntax and …
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 …
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 …
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 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 …
What does % do in JavaScript? - Stack Overflow
Dec 6, 2015 · In JavaScript, there is no build-in function for doing modulo operation, so you need to write on your own by using Math.floor() as above. Alternatively even you could easily write …
What is the difference between != and !== operators in JavaScript?
Jan 5, 2021 · Also at In JavaScript, is '!=' the same as '!=='?. More answers, but this is the duplicate target. More answers, but this is the duplicate target. – Peter Mortensen
Learn JavaScript - Codecademy
Why JavaScript Is Essential Learn what is JavaScript and why it is the most popular programming language. Discover its history, web development role, backend capabilities, and future …
What's the difference between & and && in JavaScript?
This operator is almost never used in JavaScript. Other programming languages (like C and Java) use it for performance reasons or to work with binary data. In JavaScript, it has questionable …