Javascript Function

Javascript function definitions,
There are few different methods to define a function in javascript

Example
function Samsple1()
{
 log('Hello Aruna');
}...

 

Javascript Function

 

Javascript function definitions

There are few different methods to define a function in javascript

Example

function Samsple1()
{
    log('Hello Aruna');
}

Example

var fun = function Samsple2()
{
    log('Hello Aruna');
};

Example

var ops = {
    Add:function AddNumbers(n1,n2)
    {
        return n1+n2;
    }
};

var x = ops.Add(3,5); //x =8
var y = ops.AddNumbers(3,5); //

not valid

Encapsulation-in-JavaScript

 

Example

var x = 2000;
var fun = function Encas()
{
    var y = 12;
    return y;
};

var total = x+y; //

Invalid use of y

var total = x+Encas()//total is 2012

Functions in Functions

Example

function OuterFunction(n)
{
    function InnerFunction()
    {
        return n*n;
    }
    return InnerFunction();
}
var x = OuterFunction(10);// x = 100
//InnerFunction can not call direcly

Immediate Functions

Example

(

function() {...}()

)

;

or

(

function() {...}

)

();

Module Pattern

  Extended immediate function

Example

var fun = (function(){
    var m=2000,c=0,d=10,y=2;
    return {
        GetHiddenYear:function()
        {
            return m+c+d+y;
        }
    }
}());

var x = fun.GetHiddenYear(); //x==2012;

Passing function as a parameter

Example

function Add(n1,n2)
{
    return n1+n2;
}

function calc(n1,n2,processForCalc)
{
    return processForCalc(n1,n2);
}

function executeMath()
{
    log(calc(4,4,Add));//output 8
}

Refferenced from URl »