js/class_control.js at master · ricol/js · GitHub

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alert = console.log

{
	class CoffeeMachine {
    waterAmount = 0; // the amount of water inside

    constructor(power) {
      this.power = power;
      alert( `Created a coffee-machine, power: ${power}` );
    }

  }

  // create the coffee machine
  let coffeeMachine = new CoffeeMachine(100);

  // add water
  coffeeMachine.waterAmount = 200;
}

{
	class CoffeeMachine {
    _waterAmount = 0;

    set waterAmount(value) {
      if (value < 0) throw new Error("Negative water");
      this._waterAmount = value;
    }

    get waterAmount() {
      return this._waterAmount;
    }

    constructor(power) {
      this._power = power;
    }

  }

  // create the coffee machine
  let coffeeMachine = new CoffeeMachine(100);

  // add water
  // coffeeMachine.waterAmount = -10; // Error: Negative water
}