Mastering JavaScript Basics: Your Guide to Interview Success
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Chapter 1: Introduction to JavaScript Interview Prep
Welcome to Day 22 of our 100-day journey focused on mastering JavaScript for interviews. This day is dedicated to exploring ES6 classes, specifically through interview questions and practical examples.
This section serves as an introductory block discussing the significance of learning JavaScript basics for interview preparation.
Section 1.1: ES6 Classes Overview
Key Interview Question 1: How do you define ES6 Class Declaration and Expression with examples?
To recap insights from previous discussions, we can regard classes as specialized functions. Classes can be structured as either function declarations or function expressions. For a review of these concepts, please refer to our Day 11 content linked below.
Understanding ES6 Class Declaration and Expression:
Declaration:
class MyCard {
constructor(name, address) {
this.name = name;
this.address = address;
}
}
Expression:
- An anonymous class assigned to a variable:
const MyCard = class {
constructor(name, address) {
this.name = name;
this.address = address;
}
};
- A named class assigned to a variable:
const MyCard = class Card {
constructor(name, address) {
this.name = name;
this.address = address;
}
};
Key Interview Question 2: What constitutes a class body?
The class body is enclosed in curly braces {} and encompasses the code that defines the structure and behavior of the class, including methods, constructors, and other fields.
class MyCard {
static #address = 'test address'; // Static field
getDetail() { // Regular method
return "this is my normal function";}
}
Key Interview Question 3: What is meant by Class Element?
Class elements comprise the fields, properties, and methods. They can be described in terms of Kind (K), Location (L), and Visibility (V):
- Kind: Getter, setter, method, or field
- Location: Static or instance
- Visibility: Public or private
Here’s an example:
class MyCard {
constructor(firstName, address) {
this.firstName = firstName;
this.address = address;
}
// Getter
get details() {
return this.myDetails();}
// Method
myDetails() {
return My Name is ${this.firstName} and my address is ${this.address};}
}
const personalDetail = new MyCard('Kirti', 'test address');
console.log(personalDetail.details);
Key Interview Question 4: How are static methods defined and accessed?
To create static methods or properties, the static keyword is utilized. These attributes exist on the class itself rather than on its instances. They are useful for utility functions or helper classes, and can also help maintain static data that doesn't require duplication.
Example:
class MyCard {
static bedroom = 0;
static addBedroom() {
MyCard.bedroom++;}
static getBedroomDetails() {
return MyCard.bedroom;}
}
// Accessing static variable directly
console.log("Initial Value of bedroom:", MyCard.bedroom);
// Incrementing static variable using static method
MyCard.addBedroom();
console.log("Modified Bedroom:", MyCard.bedroom);
// Accessing static variable using static method
console.log("Our Method:", MyCard.getBedroomDetails());
We will continue our exploration of classes in tomorrow's blog. Remember to take your time with these concepts!
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Chapter 2: Video Resources for Further Learning
The first video titled "JavaScript Mastery Complete Course | JavaScript Tutorial For Beginner to Advanced" offers a thorough introduction to JavaScript, covering essential concepts that are crucial for both beginners and advanced learners.
The second video, "Javascript Interview Questions and Answers - Dominate Your Next Interview," provides valuable insights and tips for tackling common interview questions in JavaScript, helping you prepare effectively.