javascript vuejs对象数组在循环中仅返回一项

Question

I am trying to iterate over an array of objects instead its returning only one item here is the code:

setAll(){
  var result =this.cart;
  for (var key in result) {
    var obj = result[key];
  }
  return obj.price;
}

and the test data

 [ { "id": 5, "price": 3200, "quantity": 8, "name": "juice" }, { "id": 6, 
  "price": 300, "quantity": 6, "name": "rice" }, { "id": 8, "price": "100", 
  "quantity": 1, "name": "water" }, { "id": 7, "price": "4500", "quantity": 
   1, "name": "meat" } ]

Answer 1

You are iterating through the array and only returning the last object. This code:

for (var key in result) {
   var obj = result[key];
}

does nothing other than set obj to the last item in the list.

Answer 2

现在，从循环的最后一次迭代开始， object将被设置为其值，并且您将仅返回该对象的价格。

Answer 3

your function replace to

setAll(){
  return this.cart.map(({ price }) => +price);
}

i am write jsfiddle example for your question

Answer 4

This worked for me:

          setAll(){
          var result =this.cart;
          var res=Object.keys(result).map(function(key){
            return parseInt(result[key].price);
          });
          return res;

         },