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In this post, you will find the solution for Day 5: Inheritance in JavaScript-HackerRank Problem. We are providing the correct and tested solutions of coding problems present on HackerRank. If you are not able to solve any problem, then you can take help from our Blog/website.
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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 Problem – Day 5: Inheritance – Hacker Rank Solution
Day 5: Inheritance – Hacker Rank Solution
Problem:
Objective
In this challenge, we practice implementing inheritance and use JavaScript prototypes to add a new method to an existing prototype. Check out the attached Classes tutorial to refresh what we’ve learned about these topics.
Task
We provide the implementation for a Rectangle class in the editor. Perform the following tasks:
- Add an area method to Rectangle‘s prototype.
- Create a Square class that satisfies the following:
- It is a subclass of Rectangle.
- It contains a constructor and no other methods.
- It can use the Rectangle class’ area method to print the area of a Square object.
Locked code in the editor tests the class and method implementations and prints the area values to STDOUT.
Day 5: Inheritance – Hacker Rank Solution
Rectangle.prototype.area = function() { return this.w * this.h; }; class Square extends Rectangle { constructor(s) { super(s); this.h = s; this.w = s; } }