डिप्लोमा इन ऑफिस मैनेजमेंट एण्ड अकाउटिंग

डिप्लोमा इन ऑफिस मैनेजमेंट एण्ड अकाउटिंग

Full Stack Web Development with Laravel

Full Stack Web Development with Laravel

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Function in java script

Block of statements or code is called a function.
 
There are two types of function
 
  • System defined function
  • User defined function
 

System defined function

A function defined the system like parseInt(), write() are called system defined function.
 

User defined function

a function defined the programmer or user is called user defined function.
 
In java script functions are created using function keyword.
 
syntax
 
function function_name(){
code...
}
 
example
 
function message(){
document.write("Hello");
}

Run the function

To run the function, we need to call the function with the function name.
 
example
 
// function call
message();

Non parametrised function

 
A function without parameter are called non parametrised function.
 
example
function sum(){
var a,b,c;
a=10;
b=20;
c=a+b;
document.write("Sum:"+c);
}

Parametrised function

A functin defined with a parameter are called parametrised function.
example
function sum(a, b){
var c;
c=a+b;
document.write("sum:"+c);
}

Parameters v/s Arguments

 
Variables write at the function definition are called function parameters 
whereas
Variables pass to the function call are called function arguments.
or
arguments are called real values.
 

Function with return statement

To return the value from the function, return statement is used.
 
example
 
function sum(a, b){
var c;
c=a+b;
return c;
}

var z;
z=sum(10,20);
document.write(z);
 

Default parameters

Value assign to the parameter are called the default parameter.
 
function sum(a=0, b=0){
var c;
c=a+b;
document.write("sum:"+c);
}
sum(); // 0
sum(10, 20) // 30
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