A JavaScript function call is an action that invokes or executes a defined function to perform a specific task or computation. Functions in JavaScript are reusable blocks of code that can be defined with a name and a set of parameters. When you call a function, you are instructing the JavaScript interpreter to execute the code inside that function. In this article, we are going to learn JavaScript Function Call.
Syntax:
call()Return Value:
It calls and returns a method with the owner object being the argument.
Example 1: Here is a basic example to describe the use of the call() method.
Javascript
// function that returns product of two numbers function product(a, b) { return a * b;}// Calling product() functionlet result = product.call(this, 20, 5);console.log(result); |
Output
100
Example 2: This example describes the use of function calls with arguments.
Javascript
let employee = { details: function (designation, experience) { return this.name + " " + this.id + designation + experience; }}// Objects declarationlet emp1 = { name: "A", id: "123",}let emp2 = { name: "B", id: "456",}let x = employee.details.call(emp2, " Manager ", "4 years");console.log(x); |
Output
B 456 Manager 4 years
Example 3: This example describes binding a function to an object.
Javascript
let obj = { a: 12, b: 13 };function sum() { return this.a + this.b;}console.log(sum.call(obj)); |
Output
25
We have a complete list of Javascript Functions, to check those please go through the Javascript Function Complete reference article.
Supported Browser:
- Google Chrome 1.0
- Firefox 1.0
- Microsoft Edge 12.0
- Internet Explorer 5.5
- Opera 4.0
- Safari 1.0
