CODEWITHSUNDEEP
typescript
Matthew
Matthew

Reputation: 13332

Initialize a property in a generic class

I would like initialize a generic class property to a default value based on the template type. Is this possible in Typescript? For example:

class Foo<T> {
  public x: T;
  constructor() {
    this.x = ???;
  }
}

I would like to set ??? such that (new Foo<number>()).x === 0 and (new Foo<boolean>).x === false and (new Foo<Bar>()).x === null. Is that possible?

Upvotes: 0

Views: 89

Answers (1)

SLaks
SLaks

Reputation: 887453

TypeScript type parameters only exist at compile-time.

It is impossible to change a value based on a type parameter.

Upvotes: 2

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