JavaScript · Language basics

Comma operator

Evaluates each expression and returns the last value. Rarely worth the confusion.

javascriptRunnable example javascript course

Syntax

a = (b++, c)

Example

Try it

let b = 1;
const c = (b++, b * 10);
console.log(b, c);

Reference pages are the quick answer. The course explains the why, shows the full example and ends with a challenge.