JSFiddle - React, Tailwind, and code Playground

JavaScript

function Network(){
 this._elements = [];
 this.addElements = function(){
 for(var i = 0; i<arguments.length; i++){
 this._elements.push(arguments[i]);
 }
 };
 this.getPowerProductionDuringTheDay = function(){
 	var powerProduction = 0;
 	for(var i = 0; i<this._elements.length; i++){
 		if(this._elements[i] instanceof PowerStation){
 			powerProduction+= this._elements[i].getPowerProductionDuringTheDay();
 		}
 	}
 	return powerProduction;
 };
 this.getPowerProductionDuringTheNight = function(){
 	var powerProduction = 0;
 	for(var i = 0; i<this._elements.length; i++){
 		if(this._elements[i] instanceof PowerStation){
 			powerProduction+= this._elements[i].getPowerProductionDuringTheNight();
 		}
 	}
 	return powerProduction;
 };

 this.getPowerConsumptionDuringTheDay = function(){
 	var powerConsumption = 0;
 	for(var i = 0; i<this._elements.length; i++){
 		if(this._elements[i] instanceof LivingHouse){
 			powerConsumption+= this._elements[i].getPowerConsumptionDuringTheDay();
 		}
 	}
 	return powerConsumption;
 };

 this.getPowerConsumptionDuringTheNight = function(){
 	var powerConsumption = 0;
 	for(var i = 0; i<this._elements.length; i++){
 		if(this._elements[i] instanceof LivingHouse){
 			powerConsumption+= this._elements[i].getPowerConsumptionDuringTheNight();
 		}
 	}
 	return powerConsumption;
 };

 this.getPowerExcessDuringTheDay = function(){
 	return this.getPowerProductionDuringTheDay() - this.getPowerConsumptionDuringTheDay();
 };

 this.getPowerExcessDuringTheNight = function(){
 	return this.getPowerProductionDuringTheNight() - this.getPowerConsumptionDuringTheNight();
 };

 this._getProfit = function(powerExcess){
 	var resultString;
 	var profit=0;
 	if(powerExcess<0){
 		resultString = "нужно закупить  энергии на: ";
 		powerExcess = Math.abs(powerExcess);
 	}
 	else{
 		resultString = "можно продать энергии на: ";
 	}

 	for(var i = 0; i<this._elements.length; i++){
 		if(powerExcess===0){
 			break;
 		}
       if(this._elements[i]...