Classes

Classes define blueprints for objects with properties and methods.

Syntax

TYPESCRIPT

1
2
3
4
5
6
7
8
9

class Animal {
    name: string;
    constructor(name: string) {
        this.name = name;
    }
    speak(): string {
        return `${this.name} makes a sound`;
    }
}

TypeScript Classes

TYPESCRIPT

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24

class Animal {
    constructor(
        public name: string,
        private sound: string
    ) {}

    speak(): string {
        return `${this.name} says ${this.sound}`;
    }
}

class Dog extends Animal {
    constructor(name: string) {
        super(name, "Woof");
    }

    fetch(): string {
        return `${this.name} is fetching!`;
    }
}

const dog = new Dog("Buddy");
console.log(dog.speak());
console.log(dog.fetch());

Try It Yourself

Practice

1

Exercise

Practice this concept.

Answer

Write the code as shown above.

Quick Quiz

1

What did you learn?

Concept A

Concept B

Concept C

Concept D

This covers the basics.

Retry Quiz

Interview Questions

Explain this concept.

It is a fundamental TypeScript feature.

Next Lesson

Inheritance