classes

Constructors, methods, inheritance, and this — the javascript.info OOP core.

Classes & OOP · 0/6 completed · scroll down for every challenge

Challenge 1 of 6

Class field

Create class `User` with constructor `(name)` storing `this.name`.

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Challenge 2 of 6 · Instance method

Challenge 2 of 6

Add `hello()` on `User` that returns `"Hi, ${this.name}"`.

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Challenge 3 of 6 · Extends

Challenge 3 of 6

Create `Admin` extending `User` with extra `role` set to `"admin"`. Keep the User constructor.

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Challenge 4 of 6 · Static method

Challenge 4 of 6

Create class `Mathy` with static `double(n)` returning n * 2.

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Challenge 5 of 6 · Getter

Challenge 5 of 6

Create class `Box` with constructor `(w, h)` and getter `area` returning w * h.

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Challenge 6 of 6 · This in method

Challenge 6 of 6

Create `Counter` with `n = 0` and `inc()` that adds 1 to `this.n` and returns it.

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