JavaScript Function Call

JavaScript function calls involve invoking a function to execute its code. You can call a function by using its name followed by parentheses (), optionally passing arguments inside the parentheses.

Syntax:

call()

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

JavaScript Function Call Examples

Example 1: This example demonstrates the use of the call() method. 

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);

Output

100

Explanation: This JavaScript code 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.

Example 2: This example display the use of function calls with arguments.

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

Explanation:

• JavaScript defines object employee with details() method. emp1 and emp2 created. call() modifies emp2, logs result.
• Objects emp1 and emp2 created. call() modifies emp2, logging concatenated details with updated properties in JavaScript code.

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

Supported browsers

• Google Chrome
• Edge
• Firefox
• Opera
• Safari