JavaScript Comma Operator

Comma Operator (,) Primarily evaluates its operands from left to right sequentially and returns the value of the rightmost operand. The comma operator is used as a delimiter for multiple expressions at a location where only one expression is required. When placing the comma operator in an expression, it executes each expression and returns the rightmost expression.

Syntax:

Expression1, Expression2, Expression3, ...so on

In the above syntax, multiple expressions are separated using a comma operator. During its execution, each expression will be executed from left to the right and the rightmost expression will be returned.

Example 1: Below is an example of the Comma operator.

JavaScript

function Func1() {
console.log('one');
return 'one';
}
function Func2() {
console.log('two');
return 'two';
}
function Func3() {
console.log('three');
return 'three';
}
// Three expressions are
// given at one place
let x = (Func1(), Func2(), Func3());
console.log(x);

Output

one
two
three
three

Example 2: The most useful application of the comma operator is in loops. In loops, it is used to update multiple variables in the same expression.

JavaScript

for (let a = 0, b =5; a <= 5; a++, b--) {
console.log(a, b);
}

Output

0 5
1 4
2 3
3 2
4 1
5 0

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Supported Browsers:

  • Google Chrome
  • Internet Explorer
  • Firefox
  • Apple Safari
  • Opera
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