Skip to content
geeksforgeeks
  • Courses
    • DSA to Development
    • Get IBM Certification
    • Newly Launched!
      • Master Django Framework
      • Become AWS Certified
    • For Working Professionals
      • Interview 101: DSA & System Design
      • Data Science Training Program
      • JAVA Backend Development (Live)
      • DevOps Engineering (LIVE)
      • Data Structures & Algorithms in Python
    • For Students
      • Placement Preparation Course
      • Data Science (Live)
      • Data Structure & Algorithm-Self Paced (C++/JAVA)
      • Master Competitive Programming (Live)
      • Full Stack Development with React & Node JS (Live)
    • Full Stack Development
    • Data Science Program
    • All Courses
  • Tutorials
    • Data Structures & Algorithms
    • ML & Data Science
    • Interview Corner
    • Programming Languages
    • Web Development
    • CS Subjects
    • DevOps And Linux
    • School Learning
  • Practice
    • Build your AI Agent
    • GfG 160
    • Problem of the Day
    • Practice Coding Problems
    • GfG SDE Sheet
  • Contests
    • Accenture Hackathon (Ending Soon!)
    • GfG Weekly [Rated Contest]
    • Job-A-Thon Hiring Challenge
    • All Contests and Events
  • JS Tutorial
  • JS Exercise
  • JS Interview Questions
  • JS Array
  • JS String
  • JS Object
  • JS Operator
  • JS Date
  • JS Error
  • JS Projects
  • JS Set
  • JS Map
  • JS RegExp
  • JS Math
  • JS Number
  • JS Boolean
  • JS Examples
  • JS Free JS Course
  • JS A to Z Guide
  • JS Formatter
Open In App
Next Article:
JavaScript String localeCompare() Method
Next article icon

JavaScript String lastIndexOf() Method

Last Updated : 16 Jul, 2024
Comments
Improve
Suggest changes
Like Article
Like
Report

The lastIndexOf() method in JavaScript is used to search for the last occurrence of a specified substring within a string.

It returns the index of the last occurrence of the specified substring, or -1 if the substring is not found.

Syntax:

str.lastIndexOf(searchValue , index)

Parameters:

lastIndexOf() Method accepts 2 parameters which are discussed below:

  • searchvalue: The searchvalue is the string that is to be searched in the base string.
  • index: defines the starting index from where the searchvalue is to be searched in the base string backward

Return value:

This method returns the index of the string (0-based) where the searchvalue is found for the last time. If the searchvalue cannot be found in the string then the method returns -1

Example 1: Finding Last Occurrence of Substring in JavaScript

The function func() initializes a string variable str with the value ‘GeeksforGeeks’. It then uses the lastIndexOf() method to find the index of the last occurrence of the substring ‘for’ within the string str. The index, which is 5, is then printed to the console.

JavaScript 
function func() {     let str = 'GeeksforGeeks';     let index = str.lastIndexOf('for');     console.log(index); } func();

Output
5

Example 2: Case-sensitive Search with JavaScript’s lastIndexOf()

The func() function initializes a string variable str with the value ‘Departed Train’. It then uses the lastIndexOf() method to find the index of the last occurrence of the substring ‘train’ (case-sensitive) within the string str. Since ‘train’ is not found in ‘Departed Train’, -1 is printed to the console.

JavaScript 
// JavaScript to illustrate lastIndexOf() method  function func() {      // Original string     let str = 'Departed Train';      // Finding index of occurrence of 'train'     let index = str.lastIndexOf('train');     console.log(index); } func();

Output
-1

We have a complete list of Javascript string methods, to check those please go through this Javascript String Complete reference article.

Supported Browsers: 

  • Google Chrome 3
  • Microsoft Edge 12
  • Mozilla Firefox 3.0
  • Safari 5
  • Opera 10.5

Next Article
JavaScript String localeCompare() Method

H
HGaur
Improve
Article Tags :
  • JavaScript
  • Web Technologies
  • JavaScript-Methods
  • javascript-string

Similar Reads

  • JavaScript String() Constructor
    The JavaScript String() Constructor is used to can be used as a constructor or a function. that creates a new string object. It can be used in two different ways: Syntax:Invoked with the new keyword: new String(object);Invoked without the new keyword: String(object);Parameters: This constructor acce
    3 min read
  • JavaScript String constructor Property
    The String constructor property in JavaScript is used to return the string constructor function for the object. The function which is returned by this property is just the reference to this function, not a string containing the function's name. The JavaScript number constructor, string constructor,
    3 min read
  • JavaScript String length Property
    The JavaScript length property is a fundamental feature used to determine the number of characters in a string. It is essential for various string operations, such as validation, manipulation, and iteration. Understanding how to effectively use the length property can simplify tasks like checking in
    3 min read
  • JavaScript String fromCharCode() Method
    The fromCharCode() method in JavaScript is a static method of the String object. Which is used to create a string from a sequence of Unicode values. Syntax:String.fromCharCode(n1, n2, ..., nX)Parameters:The method takes the UTF-16 Unicode sequences as its argument. The number of arguments to this me
    3 min read
  • JavaScript String fromCodePoint() Method
    JavaScript String fromCodePoint() is an inbuilt method in JavaScript that is used to return a string or an element for the given sequence of code point values (ASCII value). Syntax: String.fromCodePoint(a1, a2, a3, ....)Parameters:Here parameters a1, a2, etc are the sequence of code point values.Ret
    2 min read
  • JavaScript String at() Method
    JavaScript String.at() method is used to find the character at the specified index. This method is capable of taking both positive and negative indexes. The positive index finds the element from the start of the array and the negative index is used to find the element from the end of the array. Synt
    3 min read
  • JavaScript string anchor() Method
    The JavaScript anchor() method creates an anchor element that is used as a hypertext target that means when you use the anchor method in JavaScript the anchor method returns <a> elements with string and also returns "anchorname" as the value of "name" attribute like this: <a name=anchorname
    2 min read
  • JavaScript String charAt() Method
    The JavaScript String charAt() method retrieves the character at a specified index in a string. The index is passed as an argument to the method, and it returns the character at that position. Note: JavaScript uses zero-based indexing, meaning the first character is at index 0, the second at index 1
    3 min read
  • JavaScript String charCodeAt() Method
    The JavaScript str.charCodeAt() method returns a Unicode character set code unit of the character present at the index in the string specified as the argument. The index number ranges from 0 to n-1, where n is the string's length. Syntax:str.charCodeAt(index)Parameters: This method accepts a single
    3 min read
  • JavaScript String codePointAt() Method
    JavaScript string codePointAt() is an inbuilt method in JavaScript that is used to return a non-negative integer value i.e, the method returns the Unicode value at an index (position) in a string. Syntax:string.codePointAt(A)Parameters: It accepts a parameter that shows the index of an element in th
    3 min read
geeksforgeeks-footer-logo
Corporate & Communications Address:
A-143, 7th Floor, Sovereign Corporate Tower, Sector- 136, Noida, Uttar Pradesh (201305)
Registered Address:
K 061, Tower K, Gulshan Vivante Apartment, Sector 137, Noida, Gautam Buddh Nagar, Uttar Pradesh, 201305
GFG App on Play Store GFG App on App Store
Advertise with us
  • Company
  • About Us
  • Legal
  • Privacy Policy
  • In Media
  • Contact Us
  • Advertise with us
  • GFG Corporate Solution
  • Placement Training Program
  • Languages
  • Python
  • Java
  • C++
  • PHP
  • GoLang
  • SQL
  • R Language
  • Android Tutorial
  • Tutorials Archive
  • DSA
  • Data Structures
  • Algorithms
  • DSA for Beginners
  • Basic DSA Problems
  • DSA Roadmap
  • Top 100 DSA Interview Problems
  • DSA Roadmap by Sandeep Jain
  • All Cheat Sheets
  • Data Science & ML
  • Data Science With Python
  • Data Science For Beginner
  • Machine Learning
  • ML Maths
  • Data Visualisation
  • Pandas
  • NumPy
  • NLP
  • Deep Learning
  • Web Technologies
  • HTML
  • CSS
  • JavaScript
  • TypeScript
  • ReactJS
  • NextJS
  • Bootstrap
  • Web Design
  • Python Tutorial
  • Python Programming Examples
  • Python Projects
  • Python Tkinter
  • Python Web Scraping
  • OpenCV Tutorial
  • Python Interview Question
  • Django
  • Computer Science
  • Operating Systems
  • Computer Network
  • Database Management System
  • Software Engineering
  • Digital Logic Design
  • Engineering Maths
  • Software Development
  • Software Testing
  • DevOps
  • Git
  • Linux
  • AWS
  • Docker
  • Kubernetes
  • Azure
  • GCP
  • DevOps Roadmap
  • System Design
  • High Level Design
  • Low Level Design
  • UML Diagrams
  • Interview Guide
  • Design Patterns
  • OOAD
  • System Design Bootcamp
  • Interview Questions
  • Inteview Preparation
  • Competitive Programming
  • Top DS or Algo for CP
  • Company-Wise Recruitment Process
  • Company-Wise Preparation
  • Aptitude Preparation
  • Puzzles
  • School Subjects
  • Mathematics
  • Physics
  • Chemistry
  • Biology
  • Social Science
  • English Grammar
  • Commerce
  • World GK
  • GeeksforGeeks Videos
  • DSA
  • Python
  • Java
  • C++
  • Web Development
  • Data Science
  • CS Subjects
@GeeksforGeeks, Sanchhaya Education Private Limited, All rights reserved
We use cookies to ensure you have the best browsing experience on our website. By using our site, you acknowledge that you have read and understood our Cookie Policy & Privacy Policy
Lightbox
Improvement
Suggest Changes
Help us improve. Share your suggestions to enhance the article. Contribute your expertise and make a difference in the GeeksforGeeks portal.
geeksforgeeks-suggest-icon
Create Improvement
Enhance the article with your expertise. Contribute to the GeeksforGeeks community and help create better learning resources for all.
geeksforgeeks-improvement-icon
Suggest Changes
min 4 words, max Words Limit:1000

Thank You!

Your suggestions are valuable to us.

What kind of Experience do you want to share?

Interview Experiences
Admission Experiences
Career Journeys
Work Experiences
Campus Experiences
Competitive Exam Experiences