Tag: JavaScript Call() method with Examples

• The Call method is a predefined javaScript method.
• In JavaScript, the call method is used to invoke(call) a function with a specified this context and arguments provided individually.

Example 1 : (Using Call() method to invoke a function and specifying the this value )

function greeting() {
    console.log(this.greet, "learnersstore.com");
}

const obj1 = {
    greet: 'Hi'
}

const obj2 = {
    greet: 'Hello'
}

greeting.call(obj1);
greeting.call(obj2);

Output : 

Hi learnersstore.com
Hello learnersstore.com

Example 2 : (Using Call() method to invoke a function without first argument)

function greeting() {
    console.log(this.greet, "learnersstore.com");
}

const obj1 = {
    greet: 'Hi'
}


greeting.call();

Output :

undefined learnersstore.com

Note: If we are omitting the first parameter, then it returns undefined.

Example 3 : (Using Call() method to invoke a function without first argument But with globalThis)

globalThis.greet = "Hello";

function greeting() {
    console.log(this.greet, "learnersstore.com");
}

const obj1 = {
    greet: 'Hi'
}

greeting.call();

Output: 

Hello learnersstore.com

Example 4 : (Using Call() method to invoke a function with multiple arguments)

function display(name, age) {
    console.log(`Name : ${name}, Age: ${age}, Location: ${this.location}`);
}

const obj1 = {
    location: 'India',
}

display.call(obj1, "Smith", 26);

Output :

Name : Smith, Age: 26, Location: India