CODEWITHSUNDEEP
typescript
Grofit
Grofit

Reputation: 18465

Does a class NEED a constructor in Typescript?

All the examples I see show a class with a constructor. Is it ok to not put a constructor in? a lot like how C# automatically makes you a default empty constructor?

Upvotes: 36

Views: 21356

Answers (3)

Ryan Cavanaugh
Ryan Cavanaugh

Reputation: 221212

From the spec, section 8.3 (8.3):

A class may contain at most one constructor declaration. If a class contains no constructor declaration, an automatic constructor is provided, as described in section 8.3.3. (8.3.3.)

Upvotes: 49

Juraj Plavcan
Juraj Plavcan

Reputation: 181

Just to extend the accepted answer and correct an answer by Jon Gear (TS might have changed in the meantime): Derived class does not need to create a constructor with the sole purpose to call super().

https://stackblitz.com/edit/no-need-for-derived-constructor?file=index.ts

Upvotes: 12

Jon Gear
Jon Gear

Reputation: 1018

Correct. Classes in TypeScript do not require you to explicitly write a constructor. However if you are extending a base class you will need to create a constructor to call super() at a minimum.

Upvotes: 17

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