var mapFunction2 = function() {
		emit(this.cust_id, this.items);
	};

	var reduceFunction2 = function(keyCustId, valuesItems) {
		item_price_sum = 0;
		item_count = 0;
		for item in valuesItems {
			item_price_sum += valuesItems[item].price * valuesItems[item].qty;
			item_count += valuesItems[item].qty;
		}
		return (float)item_price_sum/item_count;
	};

 mapFunction1 = () => {
   itemCount = 0;
   itemPrice = 0;
   for (let i: this.items){
      let {price} = i;
      itemCount += 1;
      itemPrice += price;
   }
    let average = itemPrice / itemCount;
   emit(this.cust_id, average);
 };

 reduceFunction1 = (keyCustId, average) => {
   return average;

 var mapFunciton1 = function() {
 	var items = this.items; // array of items
 	for(item in items) {
 		emit(this.cust_id, {qty: item.qty, price: item.price});
 	}
 };

 var reduceFunction1 = function(keyCustId, item) {
 	var totalItems += item.qty;
	var totalPrice += item.price
	return totalPrice/totalItems;
 };

 var mapFunction = function() {
  
 	let qty = 0;
 	for(let k in this.item){
 		qty+=this.item[k].qty;
 	}
 	
 	emit(this.cust_id, this.price, qty);
 };

 var reduceFunction = function(cust_id, price, qty) {
 	return price/qty;
 };

 function mapFunction(){ emit(this.cust_id, this.items); };
 
 function reduceFunction(keyCustId, items){
    var itemPrice = 0;
    var quantity = 0; items.forEach(function (item) 
     {
      itemPrice += item.price* item.quantity;
      quantity += item.quantity;
     });
    return itemPrice/quantity;
 };

 var mapFunction1 = function() {
    this.items.forEach(function(item){ 
                           emit(this.cust_id, {price: item.price, qty: item.qty}); 
                      });
 };

 var reduceFunction1 = function(keyCustId, itemQtyAndPrices) {
    return Array.sum(itemQtyAndPrices.price)/Array.sum(itemQtyAndPrices.qty);
 };

 var mapFunction = function() {
 	emit(this.cust_id, this.item);
 };

 var reduceFunction = function(keyCustId, item) {
 	var totalItems += item.qty;
	var totalPrice += item.price
	return totalPrice/totalItems;
 };

 var mapFunction = function() {
     emit(this.cust_id, this.items);
 };
  
 var reduceFunction = function(keyCustId, items) {
     sum = 0;
     count = 0;
     for item in items {
	 sum += items[item].price * items[item].qty;
	 count += items[item].qty;
     }
     return sum/count;
 };