CODEWITHSUNDEEP
typescript
Amr Salama
Amr Salama

Reputation: 981

Use parent constructor in child class without redeclaration

class A {
  constructor(name: string) {}
}

class B extends A {
  constructor(name: string) {
    super(name);
  }
}

In typescript, is it possible for a child class to use the parent's constructor directly without redeclare the signature in the child ?

For example:

class A {
  constructor(name: string) {}
}

class B extends A {}

And then we can only:

new B("name");

Upvotes: 0

Views: 140

Answers (1)

Aaron Beall
Aaron Beall

Reputation: 52173

This should work. Based on ES6 class specification if you omit the constructor in a sub-class, it will use a default that passes arguments to the parent constructor:

Default constructors for classes

If you don’t specify a constructor for a base class, the following definition is used:

constructor() {}

For derived classes, the following default constructor is used:

constructor(...args) {
  super(...args);
}

(TypeScript is a superset of ES6 and follows this specification.)

Upvotes: 3

Related Questions