How to check if an object is in an array?

Question

JavaScript

Good afternoon!
How can you check if an object is in an array?
When I click, I add a product to the order array, the problem is that when I click on the same product again, it is added to the array again, how can I check whether it exists in the array or not?

addOrderList: function(index) {
            var product = this.products[index];
            this.order.orderList.push({product: product, count:1});
        }

Answer 1

You can check by matching property values:

var productBox = [{product: "Рыба", count: 10}];

function addTo(product, count){
   var cond = productBox.some(function(e){ 
        return e.product == product;
   });

   if(cond){
      alert("Такой продукт уже есть");
      //Но лучше просто увеличивать count у продукта
   }else{
      productBox.push({product:product, count:count});
   }
}

addTo("Водка", 5);
addTo("Мясо", 3);
addTo("Шампур", 10);
addTo("Водка", 22);

Answer 2

objects can be compared for example using: JSON.stringify(object)

Answer 3

There are no special functions for comparing objects in JS.
You can use something like:
https://github.com/rikkimongoose/JSonCmp/
If you know exactly the position of the object in the array, you only compare it, if not, then you pick up objects throughout the array and compare them with the incoming one.

Answer 4

underscore. js