How do substring () and substr () differ in JavaScript? For example, if you have a string 'Learning Javascript is fun' then 'Javascript' is a substring of 'Learning Javascript is fun'. The second parameter length specifies the length of the substring to be extracted using substr() method.Ī substring is a part of a string that is selected from a string. Let's now look at some examples to see substr() method in action. If the length given is negative or NaN (Not a Number) then it is treated as 0.If length is omitted or is undefined then substr() extracts substring to the end of the string.length ( optional) - This is an optional parameter that determines the length of the character to be included in the substring.If startIndex is a negative number index is counted from the end of the string.If startIndex is NaN or undefined then it is treated as 0.startIndex - It is the first parameter of the method which determines the index in the original string from where the substring is to be extracted.The syntax of substr() method is: string.substr(startIndex, length) In the above example, the substr method extracts a substring from the original string from index 1 to index 4. It takes 2 indexes as arguments and returns the substring between those indexes. The substring() is a built-in javascript method which is used to extract a substring from a string. Here we are going to all these methods in detail.

There are basically 3 methods to get substring in javascript: The image below is a visual representation of the above list of substrings. Note: It is to be noted that only a sequence of characters is considered to be a substring not a subsequence of characters.įor the string 'code' list of all substrings would be : 'code', It can be of any length from 1 character to the entire string. For example, 'Hello World' is a string, and 'Hello' is a substring of 'Hello World'.Ī substring is always a part of a string.

Difference between substring and substrĪ substring is a sequence of characters within a string.

We will first understand substring, and its relation with strings and then will look at different ways to get the substring from a string. In this tutorial, You are going to learn about substring in JavaScript and how to extract a substring from a string using different methods. Substring In JavaScript And How To Get It

Js string slice