What is a function?
Function is defined as set of systematic procedure followed to attain a particular goal.
What is a function in programming language ?
Functions in programming language is considered as block of standard codes which can be reused by calling multiple times inside the program which provides the desired output, without re-typing the code again and again.
What is a function in javascript ?
in javascript function is a keyword, defined as block of code can be called one or mutiple times when it is called inside the program to get the desired output.
What is javascript object function ?
Function Object is created by Function Constructor and will be executed globally.
So if we call the constructor directly it will create a function object, which will be in unsecured way.
Javascript full course free !!!
Click to Learn More about – Javascript online learning
Syntax :
new Function ([arg1[, arg2[, ....argn]],] functionBody)
arg1, arg2, …. , argn
It represents the argument used by function.
functionBody
It represents the function definition.
Example :
<!DOCTYPE html>
<html>
<head>
<title>Our title</title>
<script type="text/javascript">
var a = 10;
var b = 20;
var addition = new Function(a,b,add(a,b));
document.write("The value of a = " +a+'<br>');
document.write("The value of b = " +b+'<br>');
document.write("The value of addition = " + addition +'<br>');
function add(a,b){
return (a+b);
}
</script>
</head>
<body></body>
</html>
Output :
The value of a = 10
The value of b = 20
The value of addition = 30
There are few methods in Javascript object functions listed below,
| Sno | Method / Function | Description |
| 1 | apply() | apply() method is used to call a function contains this value and a single array of arguments. |
| 2 | bind() | bind() method is used to create a new function. |
| 3 | call() | call() method is used to call a function contains this value and an argument list. |
| 4 | toString() | toString() method returns the result in a form of a string. |