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Writing first Function in JavaScript

JavaScript Functions

javascript_functions

A function is a block of code designed to perform a particular task.

JavaScript function

A JavaScript function is defined with the function keyword, followed by a name, followed by parentheses ().

Function names can contain letters, digits, underscores, and dollar signs (same rules as variables).

The parentheses may include parameter names separated by commas:
(parameter1, parameter2, ...)

The code to be executed, by the function, is placed inside curly brackets: {}

Syntax

function funName(parameter1, parameter2, parameter3)
{
 // code to be executed
}

Example

function funName(arg1,arg2)
{
 var r;
 r = arg1 + arg2; //Actions
 return r; //The function returns sum of arguments
}

See also Writing Your First JavaScript Program


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