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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
// 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
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.
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
