return

return – Specifies the value to be returned by a function.

Description

return [mixed variable]

Parameters

Examples

Example #1 – return example

Return a value

Run
function f (a, b) {
	return a + b;
}

var result = f(1, 2);
console.log(result);  // 3

Example #2 – return example

If no parameter is passed to return, the result will be equal to undefined.

Run
function f () {
	return;
}

var result = f();
console.log(result);  // undefined

Example #3 – return example

Return canbe used to exit a function at any point, and the rest of the code will not be executed.

Run
var val = 'initial value';

function f (a) {
	if (a === undefined) {
		return;
	}
	val = a;
}

console.log(val);  // initial value

f();
console.log(val);  // initial value

f('changed value');
console.log(val);  // changed value

External references

• Mozilla: return statement