Comma Operator (,) mainly evaluates its operands from left to right sequentially and returns the value of the rightmost operand. A comma operator is used as a separator for multiple expressions at a place that requires a single expression. When a comma operator is placed 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 execution, each expression will be executed from left to 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';
}
let x = (Func1(), Func2(), Func3());
console.log(x);
|
Outputone
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);
}
|
Output0 5
1 4
2 3
3 2
4 1
5 0
We have a complete list of JavaScript Operators, to check those please go through the Javascript Operators Complete Reference article.
Supported Browsers:
- Google Chrome
- Internet Explorer
- Firefox
- Apple Safari
- Opera
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Last Updated :
18 May, 2023
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