Camron  Shields

Camron Shields


JavaScript Substring(): Extract a Substring from a String

In this tutorial, you’ll learn how to use the JavaScript substring() method to extract a substring from a string.

Introduction to the JavaScript substring() method

The JavaScript String.prototype.substring() returns the part of the string between the start and end indexes:

str.substring(startIndex [, endIndex])

The substring() method accepts two parameters: startIndexand endIndex:

  • The startIndex specifies the index of the first character to include in the returned substring.
  • The endIndex determines the first character to exclude from the returned substring. In other words, the returned substring doesn’t include the character at the endIndex.

If you omit the endIndex, the substring() returns the substring to the end of the string.

If startIndex equals endIndex, the substring() method returns an empty string.

If startIndex is greater than the endIndex, the substring() swaps their roles: the startIndex becomes the endIndex and vice versa.

If either startIndex or endIndex is less than zero or greater than the string.length, the substring() considers it as zero (0) or string.length respectively.

If any parameter is NaN, the substring() treats it as if it were zero (0).

JavaScript substring() examples

Let’s take some examples of using the JavaScript substring() method.

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What is GEEK

Buddha Community

JavaScript Substring(): Extract a Substring from a String
Lowa Alice

Lowa Alice


JavaScript Strings Tutorial

JavaScript Strings

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Javascript String SubString: How to Get SubString in JS

The substring() extracts characters from indexStart up to but not including indexStart in particular. If an indexEnd is omitted, then the substring() extracts characters to the end of a  string. If an indexStart is equal to the indexEnd, then the substring() returns an empty  string.

Javascript String substring()

Javascript string substring() is an inbuilt function that returns a part of the string between the start and end indexes, or to the end of a string.


The syntax for the javascript string substring() method is the following.


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Rahul Jangid


What is JavaScript - Stackfindover - Blog

Who invented JavaScript, how it works, as we have given information about Programming language in our previous article ( What is PHP ), but today we will talk about what is JavaScript, why JavaScript is used The Answers to all such questions and much other information about JavaScript, you are going to get here today. Hope this information will work for you.

Who invented JavaScript?

JavaScript language was invented by Brendan Eich in 1995. JavaScript is inspired by Java Programming Language. The first name of JavaScript was Mocha which was named by Marc Andreessen, Marc Andreessen is the founder of Netscape and in the same year Mocha was renamed LiveScript, and later in December 1995, it was renamed JavaScript which is still in trend.

What is JavaScript?

JavaScript is a client-side scripting language used with HTML (Hypertext Markup Language). JavaScript is an Interpreted / Oriented language called JS in programming language JavaScript code can be run on any normal web browser. To run the code of JavaScript, we have to enable JavaScript of Web Browser. But some web browsers already have JavaScript enabled.

Today almost all websites are using it as web technology, mind is that there is maximum scope in JavaScript in the coming time, so if you want to become a programmer, then you can be very beneficial to learn JavaScript.

JavaScript Hello World Program

In JavaScript, ‘document.write‘ is used to represent a string on a browser.

<script type="text/javascript">
	document.write("Hello World!");

How to comment JavaScript code?

  • For single line comment in JavaScript we have to use // (double slashes)
  • For multiple line comments we have to use / * – – * /
<script type="text/javascript">

//single line comment

/* document.write("Hello"); */


Advantages and Disadvantages of JavaScript

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Hire Dedicated JavaScript Developers -Hire JavaScript Developers

It is said that a digital resource a business has must be interactive in nature, so the website or the business app should be interactive. How do you make the app interactive? With the use of JavaScript.

Does your business need an interactive website or app?

Hire Dedicated JavaScript Developer from WebClues Infotech as the developer we offer is highly skilled and expert in what they do. Our developers are collaborative in nature and work with complete transparency with the customers.

The technology used to develop the overall app by the developers from WebClues Infotech is at par with the latest available technology.

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Niraj Kafle


The essential JavaScript concepts that you should understand

As a JavaScript developer of any level, you need to understand its foundational concepts and some of the new ideas that help us developing code. In this article, we are going to review 16 basic concepts. So without further ado, let’s get to it.

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