Data Structure
Networking
RDBMS
Operating System
Java
MS Excel
iOS
HTML
CSS
Android
Python
C Programming
C++
C#
MongoDB
MySQL
Javascript
PHP
Physics
Chemistry
Biology
Mathematics
English
Economics
Psychology
Social Studies
Fashion Studies
Legal Studies
- Selected Reading
- UPSC IAS Exams Notes
- Developer's Best Practices
- Questions and Answers
- Effective Resume Writing
- HR Interview Questions
- Computer Glossary
- Who is Who
What is the use of substr() method in JavaScript?
substr()
substr() method extracts parts of a string, beginning at the character at the specified index, and returns the specified number of characters. It does not change the original string.
Syntax
substr() method accepts two parameters one is start and other is length
str.substr(start , length)
Arguments
a) Start: start defines the starting index from where the sub string is to be extracted from the base string.
b) length: length defines the number of characters to be extracted starting from the start in the given string. If the second argument to the function is undefined then all the characters from the start till the end of the length is extracted.
Example
In the following example, the arguments given are (7, 17). So, substr() method obtain sub string starting from index 7 to a length of 17 characters, there by giving "Spacex, Neuralink" as output.
<html>
<body>
<p id="substring"></p>
<script>
var str = "Tesla, Spacex, Neuralink, Solarcity";
var res = str.substr(7,17);
document.getElementById("substring").innerHTML = res;
</script>
</body>
</html>Output
Spacex, Neuralink
118 Views
