JavaScript Function Call
Last Updated :
07 Mar, 2024
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 product(a, b) {
return a * b;
}
let result = product.call(this, 20, 5);
console.log(result);
|
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;
}
}
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.
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