Sum of value in a collection using flutter

Question

I have a list/collection and I need to get the sum of all prices in this list.

cart_items = [
    {
        "id": 144,
        "created_at": "2019-04-04 14:42:04",
        "updated_at": "2019-04-04 14:42:04",
        "cart_id": "3",
        "client_id": "83",
        "product_id": "6",
        "quantity": "1",
        "price": "1500",
        "name": "Cucumber (2Pcs)",
        "image": "products/es4eGjkgQ6MvzTaMyX4iXWjcSX03mVk3QB9oODWk.jpeg",
       },
    {
        "id": 145,
        "created_at": "2019-04-04 14:42:09",
        "updated_at": "2019-04-04 14:42:09",
        "cart_id": "3",
        "client_id": "83",
        "product_id": "5",
        "quantity": "1",
        "price": "2000",
        "name": "Cauliflower",
        "image": "products/lVZ31zORzltyVIDXhHoCWUgjTlal7cWd7pI8DL2V.jpeg",
        }
]

I have been trying to use the reduce method on this collection/list but I don't know how to specify that I need to get the sum for price.

Answer 1

Here you go:

cart_items.map<int>((m) => int.parse(m["price"])).reduce((a,b )=>a+b)

As @user3612643 pointed out in comment, this does not work if the collection is empty, so condition check for it required in that case.