EDUCBA

EDUCBA

MENUMENU
  • Free Tutorials
  • Free Courses
  • Certification Courses
  • 600+ Courses All in One Bundle
  • Login

JavaScript Namespace

By Asapu HarikaAsapu Harika

Home » Software Development » Software Development Tutorials » JavaScript Tutorial » JavaScript Namespace

JavaScript Namespace

Introduction to JavaScript Namespace

Today, we shall look into ‘JavaScript NameSpace’. While we are working on web applications using JavaScript functions and files, it would become difficult to challenge code. So to help us manage this code, we have a keyword ‘Namespace’ which will create mini objects of different modules or functionalities to make code readable. JavaScript does not provide Namespace by default but this functionality can be replicated. It is a container providing scope for set of identifiers, type names, functions or variables, and methods, etc. to prevent collisions among them. It can be created with ease, so with minor tweaks, a namespace can be created.

Syntax of JavaScript Namespace

First, we need to initialize an empty Namespace:

Start Your Free Software Development Course

Web development, programming languages, Software testing & others

var <namespace> = { };

Then to access variables in the namespace,

<namespace>.<identifier>

Similar to Objects in JavaScript, we initialize and access this namespace as objects.

varsampleNamespace = {
function_one: function()
{
// body of code
},
function_two: function()
{
// body of code
}
};
...
sampleNamespace. function_one ();

This JavaScript Namespace functionality can be replicated by creating a global object which contains all functions and variables. In modern web applications, different libraries and components are used, so we should have namespace to avoid code ambiguity.

Example #1

Code:

<!DOCTYPE html>
<html>
<head>
<title>JavaScript Namespace</title>
</head>
<body>
<h1>Displaying content using JavaScript Namespace</h1>
<script>
var employee = {
company: function () {
document.write("Kartik is an employee working in ");
}
}
var employer = {
company: function () {
document.write("Hetero Pharmaceutical Company");
}
}
employee.company();
employer.company();
</script>
</body>
</html>

Output:

JavaScript Namespace-1.1

Types of Namespaces

We have two types of namespaces divided as ‘Static Namespace’ and ‘Dynamic Namespace’

Popular Course in this category
JavaScript Training Program (39 Courses, 23 Projects, 4 Quizzes)39 Online Courses | 23 Hands-on Projects | 225+ Hours | Verifiable Certificate of Completion | Lifetime Access | 4 Quizzes with Solutions
4.5 (6,112 ratings)
Course Price

View Course

Related Courses
Angular JS Training Program (9 Courses, 7 Projects)Vue JS Training (1 Courses, 3 Project)
  • Static Namespace: Here, JavaScript namespace is hardcoded and functions are written within. One namespace can be reassigned to another but finally would refer to same old objects
  • Dynamic Namespace: Here, JavaScript namespace is referenced inside the function wrapper instead of hard coding. We need not bundle up return values to assign namespaces.

We shall see how JavaScript Namespace works with below-given examples

1. Static Namespace with Direct Assignment

Namespace name can be and functions can be created using namespace.

Example

Code:

<!DOCTYPE html>
<html>
<head>
<title>JavaScript Namespace</title>
</head>
<body>
<h1>Static Namespace with Direct Assignment</h1>
<script>
var employee = {}
employee.getEmployeeName = function() {
varemployeename = "Karthick lives in ";
return employeename;
}
employee.getEmployeeAddress = function() {
varemployeeaddress = "MVP Colony, Sector-8 Rushikonda Road";
return employeeaddress;
}
document.write(employee.getEmployeeName());
document.write(employee.getEmployeeAddress());
</script>
</body>
</html>

Output:

JavaScript Namespace-1.2

2. Namespace with Object Literal Notation

Here, JavaScript namespace can be defined only once and write functions within the defined namespace.

Example

Code:

<!DOCTYPE html>
<html>
<head>
<title>JavaScript Namespace</title>
</head>
<body>
<h1>Namespace with Object Literal Notation</h1>
<script>
var employee = {
getEmployeeName: function() {
varemployeeName = "Varun Kumar lives in ";
return employeeName;
},
getEmployeeAddress: function() {
varemployeeAddress = "Chicago, USA";
return employeeAddress;
}
};
document.write(employee.getEmployeeName());
document.write(employee.getEmployeeAddress());
</script>
</body>
</html>

Output:

Output-1.3

3. Namespace with Module Pattern

A namespace allows its logic to be withing global scope by function wrapper which returns an object representing modules public interface. Immediately invokes the function and assign the result to a namespace variable.

4. Supplying a Namespace Argument

This Namespace comes under dynamic namespacing also known as namespace injection. It is represented by a proxy which is referenced directly inside function wrapper. Here, we shall pass namespace as an argument to self-invoking functions.

Example

Code:

<!DOCTYPE html>
<html>
<head>
<title>JavaScript Namespace</title>
</head>
<body>
<h1>Supplying namespace as argument</h1>
<script>
var employee = {};
(function(employer) {
employer.getemployeeName = function() {
var name = "Saideep living in ";
return name;
};
employer.getemployeeAddress = function() {
var address = "Quebec, Canada works with ";
return address;
};
employer.getemployeeLOB = function() {
var LOB = "IBPM";
return LOB;
}
})(employee);
document.write(employee.getemployeeName());
document.write(employee.getemployeeAddress());
document.write(employee.getemployeeLOB());
</script>
</body>
</html>

Output:

Output-1.4

5. Creating namespace with Keyword ‘apply’

It can be created using ‘apply’ with which we will implement using ‘this’ keyword. The namespace will be injected using ‘this’ keyword which is static and cannot be modified.

Moreover, ‘apply’ API is used to separate context and arguments.

Example

Code:

<!DOCTYPE html>
<html>
<head>
<title>JavaScript Namespace</title>
</head>
<body>
<h1>Namespace with 'apply' keyword</h1>
<script>
var employee = {};
(function() {
this.getemployeeName = function() {
var name = "Narnia <br/>";
return name;
};
this.getemployeeAddress = function() {
var address = "Quebec, Canada <br/>";
return address;
};
this.getemployeeLOB = function() {
var LOB = "Information technology <br/>";
return LOB;
}
}).apply(employee);
document.write(employee.getemployeeName());
document.write(employee.getemployeeAddress());
document.write(employee.getemployeeLOB());
</script>
</body>
</html>

Output:

Output-1.5

Advantages of JavaScript Namespace

  • JavaScript namespace provides isolation and protects from other JavaScript code working on web applications.
  • On defining a namespace, ‘overwriting’ of the same variables which we might not be aware of.
  • Usage of Namespace makes JavaScript code more structured and easier to read or understand and modify accordingly.
  • As we are using namespace functions and definitions, the script of the web page should be kept above the page markup so that references and objects created are available immediately when the page loads.
  • The namespace will avoid memory leakage.

Conclusion

With this, we can conclude our topic ‘JavaScript Namespace’.We have seen what JavaScript Namespace and its advantages in our daily programming is to make code more structured and reliable. With this, we can avoid code ambiguity and lessen the risk of naming collisions. Without polluting global namespace, It can be used. Also have seen two different types of Namespacing, Static and Dynamic Name Spacing Illustrated a few basic examples for your understanding. Hope this course will help you, people, to use Namespace in your upcoming assignments.

Recommended Articles

This is a guide to JavaScript Namespace. Here we also discuss the introduction and types of namespaces along with different examples and its code implementation. You may also have a look at the following articles to learn more –

  1. JavaScript Array map()
  2. JavaScript Confirm
  3. JavaScript Array includes()
  4. JavaScript String replace

JavaScript Training Program (39 Courses, 23 Projects)

39 Online Courses

23 Hands-on Projects

225+ Hours

Verifiable Certificate of Completion

Lifetime Access

4 Quizzes with Solutions

Learn More

0 Shares
Share
Tweet
Share
Primary Sidebar
JavaScript Tutorial
  • Functions
    • JavaScript String Functions
    • JavaScript String Length
    • JavaScript split String
    • JavaScript Math Functions
    • Recursive Function in JavaScript
    • Regular Expressions in JavaScript
    • JavaScript Arrow Function
    • JavaScript Date Function
    • Match Function in Javascript
    • Replace Function in JavaScript
    • JavaScript Call Function
    • JavaScript Pass By Value
    • split() Function in JavaScript
    • reduce() Function JavaScript
    • JavaScript String replace
    • JavaScript Compare Strings
    • JavaScript Sleep
    • JavaScript toLowercase()
    • JavaScript String to Float
    • JavaScript String to Number
    • JavaScript String to int
    • JavaScript Object to String
    • JavaScript Convert to JSON
    • JavaScript Append
    • Javascript Array to String
    • Javascript Nested Functions
    • Set in JavaScript
    • Vectors in JavaScript
    • Javascript Anonymous Function
    • sign() in JavaScript
    • isNaN() JavaScript
    • Slice() Method in JavaScript
    • Javascript void
    • endsWith() in JavaScript
    • trim() Function in JavaScript
    • JavaScript typeof
    • JavaScript indexOf()
    • JavaScript encodeURI()
    • JavaScript Random
    • Ceil() in JavaScript
    • JavaScript tofixed
    • JavaScript hash()
    • JavaScript MD5
    • JavaScript search
    • JavaScript z-index
    • JavaScript Absolute Value
    • JavaScript Closure
    • Javascript Prototype
    • JavaScript Date parse
    • JavaScript DatePicker
    • JavaScript Parse String
    • JavaScript undefined
    • JavaScript FileReader
    • JavaScript Style visibility
    • JavaScript sleep Function
    • JavaScript forEach()
    • JavaScript keys()
    • JavaScript keycodes
    • JavaScript find() 
    • JavaScript values()
    • JavaScript Counter
    • JavaScript Countdown
    • JavaScript instanceof
    • JavaScript Delay
    • JavaScript Default Value
    • JavaScript concat String
    • JavaScript Document Object Model
    • Unshift JavaScript
    • JavaScript Callback Function
    • JavaScript hasOwnProperty()
    • JavaScript UUID
    • JSON Parser
    • JSON Array of Strings
    • Sublime Pretty JSON
    • JavaScript JSON to string
    • JavaScript Uppercase
    • JavaScript Namespace
    • JavaScript Range
    • JavaScript JSON
    • JavaScript exec()
    • JavaScript test()
    • JavaScript Self Invoking Functions
    • JSON Stringify Pretty
    • JavaScript findIndex()
    • JavaScript entries()
    • JavaScript join()
    • JavaScript lastIndexOf()
    • JavaScript every()
    • JavaScript getElementById()
    • JavaScript getElementsByName()
    • JavaScript getElementsByTagName()
    • JavaScript getElementsByClassName()
    • JavaScript Animation
    • JavaScript Minify
  • Basic
    • Introduction To JavaScript
    • What is JavaScript
    • What Javascript Can Do
    • Uses of JavaScript
    • How JavaScript Works
    • Is Javascript Case Sensitive
    • Is Javascript Object Oriented
    • Features of JavaScript
    • Careers in JavaScript
    • How to Install JavaScript
    • Best Javascript Frameworks
    • JavaScript MVC Frameworks
    • JavaScript Tools
    • What is JSON
    • What is Redux
    • What is ES6
    • Uses of React JS
    • How Analytics.JS Works
    • JavaScript Compilers
    • Java and JavaScript
    • JavaScript Literals
    • Variables in JavaScript
    • JavaScript Global Variable
    • JavaScript Keywords
    • String in JavaScript
    • Pointers in JavaScript
    • Primitive Data Types in JavaScript
    • JavaScript console log
    • Object in JavaScript
    • JavaScript Enum
    • Arithmetic in JavaScript
    • Assignment Operator in JavaScript
    • JavaScript Modules
    • Cheat Sheet JavaScript
    • NPM Alternatives
  • Objects
    • JavaScript Objects
    • JavaScript History Object
    • JavaScript Object Notation
    • JavaScript Map Object
    • JavaScript Date Object
    • JavaScript Window Object
    • JavaScript Object Constructors
    • JavaScript Clone Object
    • JavaScript Object.assign()
    • JavaScript object.is()
    • JavaScript Object to JSON
  • Operators
    • Arithmetic Operators in JavaScript
    • JavaScript Assignment Operators
    • Logical Operators in JavaScript
    • Comparison Operators in JavaScript
    • Bitwise Operators in JavaScript
    • Ternary Operator JavaScript
    • Boolean Operators in JavaScript
    • JavaScript?Modulo
    • JavaScript Boolean()
    • Unary Operators in JavaScript
    • JavaScript Number
    • JavaScript Floating
    • JS Operator Precedence
  • Control statements
    • Control Statement in JavaScript
    • Conditional Statements in JavaScript
    • Break Statement in JavaScript
    • Continue in JavaScript
    • Switch Statement in JavaScript
    • Case Statement in JavaScript
    • JavaScript if Statement
    • Nested if in JavaScript
    • JavaScript elseIf
  • Loops
    • For Loop in JavaScript
    • While Loop in JavaScript
    • Do While Loop in JavaScript
    • Nested Loop in JavaScript
  • Array
    • Arrays in JavaScript
    • 2D Arrays in JavaScript
    • Multi-Dimensional Array in JavaScript
    • Associative Array in JavaScript
    • JavaScript Declare Array
    • Arrays Methods in JavaScript
    • JavaScript Loop Array
    • String Array in JavaScript
    • JavaScript Get Array Length
    • JavaScript Merge Arrays
    • JavaScript Array Sort
    • JavaScript Array Push
    • JavaScript Iterate Array
    • JavaScript Empty Array
    • JavaScript Array Concat
    • Dynamic Array in JavaScript
    • JavaScript subarray()
    • JavaScript Array Filter
    • JavaScript Nested Array
    • JavaScript Flatten Array
    • JavaScript Array map()
    • JavaScript Array includes()
    • JavaScript Array Contain
    • JavaScript Array Slice
    • JavaScript Copy Array
    • Javascript Sum Array
    • JavaScript reverse Array
    • JSON Parse Array
  • Sorting
    • Sorting Algorithms in JavaScript
    • Insertion Sort in JavaScript
    • Merge Sort in JavaScript
    • Quick Sort in JavaScript
    • Bubble Sort in JavaScript
    • pop() in JavaScript
    • push() in JavaScript
    • Sort string in JavaScript
  • Events
    • JavaScript Events
    • JavaScript Event Handler
    • JavaScript Keyboard Events
    • JavaScript Mouse Events
    • JavaScript mousemove
    • JavaScript mousedown
    • JavaScript onchange
    • JavaScript onmouseout
    • JavaScript Onkeydown
    • JavaScript onsubmit
    • JavaScript Form Events
    • JavaScript Window Events
    • JavaScript Custom Events
    • JavaScript Alert
    • JavaScript Confirm
    • JavaScript onclick Alert
    • JavaScript Apply
    • JavaScript onblur
    • JavaScript onkeyup
    • JavaScript onfocus
  • Advanced
    • Constructor in JavaScript
    • Inheritance in JavaScript
    • Polymorphism in JavaScript
    • JavaScript Static Method
    • Navigator in JavaScript
    • Abstract Classes in JavaScript
    • keyword in JavaScript
    • Overriding in JavaScript
    • JavaScript Clear Console
    • JavaScript References
    • JavaScript list
    • JavaScript Grid
    • JavaScript innerText
    • Cookies in JavaScript
    • Delete Cookie in JS
    • Encapsulation in JavaScript
    • JavaScript Parent Node
    • JavaScript Parent
    • Javascript Remove Element
    • Errors in JavaScript
    • Forms in JavaScript
    • JavaScript Validator
    • JavaScript Form Validation
    • Email Validation in JavaScript
    • Hamburger Menu JavaScript
    • JavaScript Date Formats
    • JavaScript Number Format
    • JavaScript Debugger
    • JavaScript Stack
    • Queue in JavaScript
    • parseFloat in JavaScript
    • Javascript innerHTML
    • JavaScript setInterval
    • JavaScript Popup Box
    • JavaScript Message Box
    • Lightbox in JavaScript
    • Javascript Design Patterns
    • addEventListener JavaScript
    • Timer in JavaScript
    • JavaScript setTimeout
    • JavaScript clearTimeout()
    • JavaScript String Format
    • JavaScript Scroll to Top
    • JavaScript Function Declaration
    • JavaScript Function Arguments
    • Javascript Strict Mode
    • File Handling in JavaScript
    • JavaScript parseInt
    • JavaScript prompt
    • JavaScript Set Class
    • JavaScript Try Catch
    • Javascript Throw Exception
    • Finally in JavaScript
    • JavaScript Get Element by Class
    • JavaScript Obfuscator
    • Disable JavaScript
    • SetAttribute JavaScript
    • JavaScript Cursor
    • LinkedList in JavaScript
    • JavaScript WeakMap
    • JavaScript DOM
    • JavaScript defer
    • JavaScript Promise
    • Pagination in JavaScript
    • JavaScript Refresh Page
    • JSON.stringify JavaScript
    • JavaScript IIFE
    • JavaScript Fetch API
    • JavaScript Auto Complete
    • JavaScript Copy to Clipboard
    • JavaScript querySelector
    • JavaScript Graph
  • Programs
    • Patterns in JavaScript
    • Reverse in JavaScript
    • Palindrome in JavaScript
    • Factorial Program in JavaScript
    • Fibonacci Series In JavaScript
    • Square Root in JavaScript
    • Prime Number in JavaScript
    • Armstrong Number in JavaScript
    • Random Number Generator in JavaScript
    • Reverse String in JavaScript
    • JavaScript Random String
    • Functional Programming in JavaScript
  • Interview Questions
    • Javascript Interview Questions
    • JSON Interview Questions
    • JS Interview Questions

Related Courses

JavaScript Certification Training

Angular JS Certification Training

Vue JS Training

Footer
About Us
  • Blog
  • Who is EDUCBA?
  • Sign Up
  • Corporate Training
  • Certificate from Top Institutions
  • Contact Us
  • Verifiable Certificate
  • Reviews
  • Terms and Conditions
  • Privacy Policy
  •  
Apps
  • iPhone & iPad
  • Android
Resources
  • Free Courses
  • Java Tutorials
  • Python Tutorials
  • All Tutorials
Certification Courses
  • All Courses
  • Software Development Course - All in One Bundle
  • Become a Python Developer
  • Java Course
  • Become a Selenium Automation Tester
  • Become an IoT Developer
  • ASP.NET Course
  • VB.NET Course
  • PHP Course

© 2020 - EDUCBA. ALL RIGHTS RESERVED. THE CERTIFICATION NAMES ARE THE TRADEMARKS OF THEIR RESPECTIVE OWNERS.

EDUCBA Login

Forgot Password?

EDUCBA
Free Software Development Course

Web development, programming languages, Software testing & others

*Please provide your correct email id. Login details for this Free course will be emailed to you
Book Your One Instructor : One Learner Free Class

Let’s Get Started

This website or its third-party tools use cookies, which are necessary to its functioning and required to achieve the purposes illustrated in the cookie policy. By closing this banner, scrolling this page, clicking a link or continuing to browse otherwise, you agree to our Privacy Policy

EDUCBA

*Please provide your correct email id. Login details for this Free course will be emailed to you
EDUCBA
Free Software Development Course

Web development, programming languages, Software testing & others

*Please provide your correct email id. Login details for this Free course will be emailed to you

Special Offer - JavaScript Training Program (39 Courses, 23 Projects) Learn More