How to acess private function from another function-CodePudding

I am receiving an error while trying to access a private function inside another function

class GameController {
  public async cardShuffle (req: Request, res: Response): Promise<void> {
      other code here...

      const treatment = this.cardTreatment(shuffledCards)

      console.log(treatment)
    })
  }

  private cardTreatment (cards: Array<String | Number>): Array<String | Number> {
    return cards
  }
}

export default new GameController()

Error:

(node:2645) UnhandledPromiseRejectionWarning: TypeError: Cannot read property 'cardTreatment' of undefined

CodePudding user response：

The issue is not that the function is private, but that this is undefined in the context you called it. For example, you may have done const shuffle = controller.cardShuffle; shuffle().

See below:

class Example {
    foo() {
        return this.bar();
    }
    bar() {
        return 'It works!';
    }
}

const test = new Example();

console.log(test.foo())

const foo = test.foo;

try {
    console.log(foo())
} catch(e) {
    console.log('Doesnt work');
}

console.log(foo.call(test))