JavaScript Day 19 — Mastering JavaScript Basics: A Comprehensive Guide for Interview Preparation

100 Days of JavaScript Interview Prep: A Beginner’s Journey

Welcome to Day 19–100 Days of JavaScript Interview Prep: A Beginner’s Journey

Embarking on a 100-day adventure focused on learning, practice, and growth sounds like an incredibly rewarding journey.

DAY 19 (April 10th, 2024) — ES6 Classes Interview Questions ?

Note — Most important interview question (big topic-we will cover next two days with different example)

Explain the concept of ES6 classes in JavaScript and demonstrate how to create a class with methods and properties?

Answer : ES6(ECMAScript 2015) introduced the class syntax to provide a cleaner way to follow object-oriented programming patterns.

Let’s first understand Pre-ES6 Prototypal Inheritance

Pre-ES6 Prototypal Inheritance

1. JavaScript traditionally used prototype-based inheritance.
2. Objects inherits properties and methods directly from other objects, without the need for classes.
3. Constructor functions and attach methods to their prototypes to achieve inheritance behavior.

function Animal(name) {
    this.name = name;
}

Animal.prototype.detail = function() {
    console.log(`${this.name} says hello!`);
};

const myAnimal = new Animal('tiger');
myAnimal.detail(); // Output: tiger says hello!

Now let’s move to Introduction of ES6 Classes with basic introduction today.

With the introduction of ES6, JavaScript provided support of classes with class syntax.

It provides a more structured and readable way

class Animal {
  constructor(name){
     this.name = name
  }
 speak(){
  console.log(`${this.name} says hello!`);
}
}

const myAnimal = new Animal('tiger');
myAnimal.speak(); // tiger says hello !

Happy Coding and Stay Tuned :)

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Kirti Kaushal

#Es6 #interview #javascriptinterview #coding