JavaScript Function Call (original) (raw)

Last Updated : 05 Jun, 2024

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:

call()

**Return Value: It calls and returns a method with the owner object being the argument.

JavaScript Function Call Examples

**Example 1: In this example, we defines a product() function that returns the product of two numbers. It then calls product() using call() with `this` as the context (which is typically the global object), passing 20 and 5 as arguments. It logs the result, which is 100

JavaScript `

// function that returns product of two numbers function product(a, b) { return a * b; }

// Calling product() function let result = product.call(this, 20, 5);

console.log(result);

**Example 2: This example we defines an object “employee” with a method “details” to retrieve employee details. Using call(), it invokes “details” with “emp2” as its context, passing arguments “Manager” and “4 years”, outputting the result.

JavaScript `

let employee = { details: function (designation, experience) { return this.name + " " + this.id + designation + experience; } }

// Objects declaration let 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

We have a complete list of Javascript Functions, to check those please go through the Javascript Function Complete reference article.

**Supported browsers