Day 4: Classes in JavaScript | 10 Days Of JavaScript Solutions | HackerRank Programming Solutions [💯Correct]

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Introduction To JavaScript

JavaScript is a lightweight, cross-platform, and interpreted scripting language. It is well-known for the development of web pages, many non-browser environments also use it. JavaScript can be used for Client-side developments as well as Server-side developments. JavaScript contains a standard library of objects, like Array, Date, and Math, and a core set of language elements like operators, control structures, and statements.

Advantages of JavaScript

The merits of using JavaScript are −

  • Less server interaction − You can validate user input before sending the page off to the server. This saves server traffic, which means less load on your server.
  • Immediate feedback to the visitors − They don’t have to wait for a page reload to see if they have forgotten to enter something.
  • Increased interactivity − You can create interfaces that react when the user hovers over them with a mouse or activates them via the keyboard.
  • Richer interfaces − You can use JavaScript to include such items as drag-and-drop components and sliders to give a Rich Interface to your site visitors.

Link for the ProblemDay 4: Classes – Hacker Rank Solution

Day 4: Classes– Hacker Rank Solution

Problem:

Objective

In this challenge, we practice using JavaScript classes. Check the attached tutorial for more details.

Task

Create a Polygon class that has the following properties:

  • constructor that takes an array of integer values describing the lengths of the polygon’s sides.
  • perimeter() method that returns the polygon’s perimeter.

Locked code in the editor tests the Polygon constructor and the perimeter method.

Note: The perimeter method must be lowercase and spelled correctly.

Input Format

There is no input for this challenge.

Output Format

The perimeter method must return the polygon’s perimeter using the side length array passed to the constructor.

Explanation

Consider the following code:

// Create a polygon with side lengths 3, 4, and 5
let triangle = new Polygon([3, 4, 5]);

// Print the perimeter
console.log(triangle.perimeter());

When executed with a properly implemented Polygon class, this code should print the result of 

image 23
Day 4: Classes – Hacker Rank Solution
function Polygon(shape) {
  this.type = shape;
  this.perimeter = getPerimeter;
}

function getPerimeter() {
  return this.type.reduce((a, b) => a + b);
}

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