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:
What is Math in JavaScript?
Next article icon

What is Call in JavaScript ?

Last Updated : 07 Feb, 2024
Comments
Improve
Suggest changes
Like Article
Like
Report

The call method is used to invoke the function with different this object. In JavaScript, this refers to an object. It depends on how we are calling a particular function. In the global scope, this refers to the global object window. The inside function also refers to the global object window.

In strict mode, when we use any function then this refers to undefined. In functions like call, this could refer to a different object. With the help of the call method, we can invoke a particular function with different objects.

Syntax:

functionName.call(thisArg, arg1, arg2, ...)

Parameter:

  • functionName: The function to be called.
  • thisArg: The value to be passed as the this parameter when calling the function. If the function is a non-method function (i.e., a function declared at the global scope), thisArg is the global object (window in a browser, global in Node.js).
  • arg1, arg2, ...: Arguments to be passed to the function individually.

Example: Here, We have an object person with a method fullName that takes two additional parameters city and country. We have two other objects, john and jane, representing different people with their first and last names. We use call to invoke the fullName method of person, passing john and jane as the this value respectively, along with additional arguments representing the city and country. The fullName method of person is invoked with the this context set to john and jane respectively, resulting in the output of their full names along with the provided city and country.

JavaScript 
const person = {     fullName: function (city, country) {         return `this.firstName + " " + this.lastName +          ", " + city + ", " + country;`     } }  const john = {     firstName: "John",     lastName: "Doe" }  const jane = {     firstName: "Jane",     lastName: "Smith" }  // Using call to invoke the fullName // function with different this values console.log(     person.fullName.call(john, "New York", "USA")); console.log(     person.fullName.call(jane, "London", "UK"));

Output
this.firstName + " " + this.lastName +          ", " + city + ", " + country; this.firstName + " " + this.lastName +          ", " + city + ", " + country;

Next Article
What is Math in JavaScript?

A
amanv09
Improve
Article Tags :
  • JavaScript
  • Web Technologies
  • JavaScript-QnA
  • WebTech-FAQs

Similar Reads

  • What is $ {} in JavaScript ?
    In JavaScript, the ${} syntax is used within template literals, also known as template strings. Template literals, introduced in ECMAScript 6 (ES6), provide a convenient way to create strings with embedded expressions. They are enclosed within backticks (`) instead of single quotes ('') or double qu
    2 min read
  • What is JavaScript?
    JavaScript is a powerful and flexible programming language for the web that is widely used to make websites interactive and dynamic. JavaScript can also able to change or update HTML and CSS dynamically. JavaScript can also run on servers using tools like Node.js, allowing developers to build entire
    6 min read
  • What is Math in JavaScript?
    JavaScript provides a built-in Math object that provides a set of methods to perform mathematical operations. These operations range from basic to more complex functions like trigonometry and logarithms. The Math object allows you to perform calculations without the need for writing custom functions
    2 min read
  • What are JavaScript Events ?
    JavaScript Events are the action that happens due to the interaction of the user through the browser with the help of any input field, button, or any other interactive element present in the browser. Events help us to create more dynamic and interactive web pages. Also, these events can be used by t
    7 min read
  • JavaScript Function Call
    The call() method is a predefined JavaScript method. It can be used to invoke (call) a method with an owner object as an argument (parameter). This allows borrowing methods from other objects, executing them within a different context, overriding the default value, and passing arguments. Syntax: cal
    2 min read
  • JavaScript Ellipsis
    JavaScript Ellipsis (also known as the spread/rest operator) is represented by three dots (...). It is used for various tasks, such as spreading elements of an array into individual values or collecting multiple values into an array or object. It simplifies data manipulation and function parameter h
    3 min read
  • JavaScript Callbacks
    In JavaScript, callbacks play an essential role in handling asynchronous tasks like reading files, making API requests, and executing code after certain events. If you’ve ever heard the phrase "I will call back later!", that’s exactly how callbacks work. What is a Callback Function?A callback functi
    5 min read
  • JavaScript Course What is JavaScript ?
    JavaScript is a very famous programming language that was originally started in the year of 1995 with the motive of making web pages alive. It is also an essential part of the web developer skillset. In simple terms, if you want to learn web development then learn HTML & CSS before starting JavaScri
    3 min read
  • Console in JavaScript
    The console object provides access to the browser's debugging console (or terminal in Node.js). It is used to log information, debug code, and interact with the runtime environment during development. Commonly Used console MethodsHere are the most frequently used methods of the console object: 1. co
    3 min read
  • How to call JavaScript function in HTML ?
    In HTML, you can easily call JavaScript functions using event attributes like onclick and onload. Just reference the function name within these attributes to trigger it. You can also call functions directly within script blocks using standard JavaScript syntax. Let's create an HTML structure with so
    2 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