Issue

This Content is from Stack Overflow. Question asked by GoodMan

I am reading a code like below:

export abstract class CustomError extends Error {
  abstract statusCode: number;

  constructor(message: string) {
    super(message);

    Object.setPrototypeOf(this, CustomError.prototype);

  }

  abstract serializeErrors(): { message: string; field?: string }[];
}

I can’t understand what does this refer to? I think in this case this should be equal to CustomError.prototype, and if so, this expression would be meaning less to me:

Object.setPrototypeOf(this, CustomError.prototype);

Because it’s like:

Object.setPrototypeOf(this, this);

Solution

this reffers to the variable itself. If I made a class,

class thing{
         constructor() {console.log(this)}
}
new thing();

"this" reffers to the class.

This Question was asked in StackOverflow by GoodMan and Answered by BREgitLEEhub2222 It is licensed under the terms of CC BY-SA 2.5. - CC BY-SA 3.0. - CC BY-SA 4.0.