return statement JS Home  <<  JS Reference  <<  return

Value returned from a function.

Description

Specifies an expression to be returned from a function.

If no return expression is declared the function will return undefined.

Syntax

Signature Description
return [expression];Specifies an expression to be returned from a function.

Parameters

Parameter Description
expressionAn optional expression to be returned from the function.

Examples

The code below gives an example of using the return statement.


// Create a function statement that takes an argument and returns square of the argument.
function squareNumber(a) {
  return a * a;
}

alert(squareNumber(9));
alert(squareNumber(13));

Press the button below to action the above code:

Related Tutorials

JavaScript Intermediate Tutorials - Lesson 8 - Functions