JavaScript OOP example 3

OOP3.js

//Prototype inheritance
//===================================================================

function Machine (power) {
	var self = this;
	
	self._enabled = false;
	
	this._power = power;
	
	this.enable = function(){
		self._enabled = true;
		console.log(self._enabled);
	};
	
	this.disable = function () {
		self._enabled = false;	
	};
};

function CoffieMachine (power) {
	
	var waterAmount = 0;
	
	this.setWaterAmount = function(amount){
		waterAmount = amount;
	};
	
	this.checkStatus = function(){
		return this._enabled;
	};
	
	this.checkPower = function(){
	 	return this._power;
	};
	
	this.run = function(){
		
		if (this._enabled === false) {
			
			throw new Error('Кофемашина не включена');
			return;
			
		} else if (waterAmount <= 0) {
			
			throw new Error ('Залейте воду');
			
		} else {
			
			console.log(`Кофемашина включена. Количество воды: ${waterAmount}`);
		}
	};
	
	//Inheritance from Machine
	Machine.apply(this, arguments);
};

var coffeeMachine = new CoffieMachine(10000);

//coffeeMachine.enable();
//coffeeMachine.setWaterAmount(1000);
//coffeeMachine.run();


function Fridge (power, temp) {
	
	Machine.apply(this, arguments);
	
	let temperature = temp;
	let food = [];
	
	this.getFoodItem = function (item) {
		
		var foodItem = item.toLowerCase();
		
		if (food.indexOf(foodItem) === -1) { throw new Error ('Такой еды нет. Есть: ' + food.slice().join(', ')) }
		
		else {
			return `${foodItem} лежит на полке № ${food.indexOf(foodItem)}`;
		}
	};
	
	
	this.getFood = function(){
		return food.slice();	
	};
	
	this.getTemp = function(){
		return temperature;
	};
	
	this.getPower = function(){
		return this._power;
	};
	
	this.run = function(){
		console.log('Running. Working temperature is:' + temperature);
	};
	
	
	//Переопредедение метода с сохранением функционала родительского
	var parentEnable = this.enable;
	
	this.enable = function(){
		parentEnable.apply(this.arguments);
		this.run();
	};
	
	this.checkStatus = function(){
		return this._enabled;
	};
	
	this.addFood = function(){
		
		if (!this._enabled) {
			console.log(this._enabled);
			throw new Error ('Сначала включите холодильник');	
		}
		
		if (arguments.length <=0 ) {
			
			throw new Error('Положите еду');
			return;
				
		} 
		
		else {
			
			for(var i = 0; i < arguments.length; i++){
				
				if (typeof arguments[i] != 'string') { continue; } 
				else { food.push(arguments[i].toLowerCase()); };
				
			}
		}
	};
};

var fridge = new Fridge(1000, 10);

fridge.enable();
console.log(fridge.checkStatus());
fridge.addFood('APPLE');
console.log(fridge.getFood());
console.log(fridge.getFoodItem('ApPle'));
fridge.addFood('beer', 'babana');
console.log(fridge.getFood());
console.log(fridge.getFoodItem('Beer'));