More Javascript Examples / Practice Programs

Functions in JavaScript

In functions in javascript are reusable blocks of code that perform specific tasks. It is defined using the function keyword followed by a set of parentheses that can include the function name and any parameters to the function. A function can pass one or more values and return a value when it is finished executing.

Functions in JavaScript With Examples

Syntax:

function function_name(parameter1, parameter2, parameter3) {

  // executable code

  // can reference parameters and other variables

  return result; 

}

function keyword:

This keyword is used to define a new function.

function_name:

The name of the function.It should be descriptive and start with a lowercase letter.

Parameter1, Parameter2, Parameter3:

The input parameters of the function. Optional, but if optional, must be enclosed in parentheses and separated by commas.

Example:

let person = {

  name: "Nisha",

  sayHello: function() {

    console.log("Hello, my name is " + this.name + ".");

  }

};

person. sayHello();

Output:

Hello, my name is Nisha.

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