A JavaScript function is a group of reusable all the source code which can be called any where in your web page or script. This terminate the required of writing the same source code repete and repete. It useful programmers in writing modular or MVC based source codes. Functions allow a devloper to divide a big script project into a number of small as well as manageable functions.
JavaScript Functions
A JavaScript function is a one type of the block of code designed to execute a specific module.A JavaScript function is executed when “entity” invokes it (calls it)
Syntax:
function YourJSfunctionName(Parameter1, Parameter2, ..)
{
// Some here Function body
}
Advantage of JavaScript function
There are Very Imp 2 Main advantages of JavaScript functions.
- Code reusability:
- Less coding:
Basic Example
JavaScript Functions
This JS example calls a function which executes a calculation, and returns the output:
JavaScript Function Methods
how to call a function as well as learn to types of functions and call javascript function from html source code using javascript
| Method | Description |
|---|---|
| apply() | This is helps to call a function data contains this data value and a single array of Parameters. |
| bind() | This is helps to create a new function. |
| call() | This is helps to call a function contains this value as well as an Parameters list. |
| toString() | This data returns the output in a HTML form of a data string. |
The Arguments Object
All the functions in JavaScript source code can use Parameters object by default. a Parameters object added value of each parameter.
The Parameters object is an array like object. You can supports it is a data values using index similar to array. therefor, it does not support array methods in js.
Example: Arguments Object
Example: JavaScript arguments object
Example: Function Returning a Function
Examples: Function returing a function
Calling a Function
Live Demo
Click the bellow button to call the js function
This terminate the required of writing the same source code repete and repete. It useful programmers in writing modular or MVC based source codes.
Function Parameters
Click the bellow button to call the js function
Functions allow a devloper to divide a big script project into a number of small as well as manageable
javascript function return | The return Statement
Click the bellow button to call the js function
A JavaScript function is a group of reusable all the source code which can be called any where in your web page or script.
Arrow functions in JavaScript
also you can learn here arrow function javascript.
arrow function javascript
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