User defined function in javascript,User Defined Function,Java Script Functions

User defined function: These functions are defined by user. User defined function should not match with pre defined functions. User can define the function in four types.

Normal function:

Syntax:

function function name()

{

//ststements;

}

Example:

function my function()

{

var a=10;

var b=20;

var c=a+b;

document.write(“normal function”=+c);

}

my function();

document.write(“<br>”);

Function with arguments:

Arguments: arguments is called function variables arguments. Defined in function definition, when the user call the function, it will pass the values to variables values are called parameters.

Syntax:

function.function name(arg1,arg2,….)

{

document.write(arg1,arg2)

}

function name(par1,par2….)

Example:

function.my function2(a,b)

{

var(=a+b);

document.write(c);

}

my function2(50,20);

Function with return value:

Return: It is used to stop the function execution, It can write some value also(return.false;).

Example:

function.my function3()

{

document.write(“ststement01<br>”);

return’name’;

}

var x=my function3()

document.write(x);

Function with arguments and return:

Example:

function my function4(a)

{

document.write(“ststement01<br>”);

return a*a;

}

document.write(“ststement01<br>”);

var y=my function4(100);

document.write(y);