how can I count total number of keyValues in array of object

Question

i got the array of dictionary in CartDataModal structure

class CartDataModal: NSObject {
    static let shared_Inst = CartDataModal()
    var cartArrayDict = [[String:Any]]()
}

the received data is in format below

restmenu is after inserting

[
["ItemName": Cheese Burger, "ItemPrice": 50, "ItemQuant": "2"], 
["ItemName": Veg Burger, "ItemPrice": 30, "ItemQuant": 0], 
["ItemName": Chicken Burger, "ItemPrice": 50, "ItemQuant": 0], 
["ItemName": Veg & Crisp Burger, "ItemPrice": 45, "ItemQuant": 0], 
["ItemName": Maharaja Burger, "ItemPrice": 60, "ItemQuant": 0], 
["ItemName": Coke, "ItemPrice": 50, "ItemQuant": 0], 
["ItemName": Pepsi, "ItemPrice": 50, "ItemQuant": 0]
]

how can i count the total number of keyValues for "ItemQuant"?

You can use cartArrayDict.count for the total number of ItemName, if ItemName are not duplicate. You can add it into set to remove the redundancy. — Ankit Jayaswal
– Ankit Jayaswal, Commented May 22, 2018 at 14:05
currently I need total number of "ItemQuant" combined to display it in cart — Gurjit Singh
– Gurjit Singh, Commented May 23, 2018 at 14:03

Chris · Accepted Answer · 2018-10-02 21:48:00Z

3

Here is a way to count the number of items in the cartArrayDict while ensuring that only those keys that are "ItemName" are included. It uses the reduce() function of the array with the desired key of the dictionary, with a nil coalescing operator in case the key does not exist.

How to get count of items (by key) in array of dictionaries

let count: Int = cartArrayDict.reduce(0) {
    $0 + ($1["ItemName"] != nil ? 1 : 0)
}
print(count) // Or do whatever you want with the value

How to get total sum of quantities

Here is how to get total sum of the quantities, as asked in comments.

let totalQuantity: Int = cartArrayDict.reduce(0) {
    $0 + ($1["ItemQuant"] as? Int ?? 0)
}
print(totalQuantity) // Or do whatever you want with the value

How to get total price for one type of item

I have presented this as a function.

func getTotalPrice(for name: String) -> Int {
    let totalPrice: Int = cartArrayDict.reduce(0) {
        $0 + ($1["ItemName"] == name ? $1["ItemPrice"] as? Int : 0)
    }
    return totalPrice
}

let totalPriceForCoke = getTotalPrice(for: "Coke")

Note that this assumes the values for key "ItemName" are String type. At present your values are not strings and I am not sure why this should be. I suggest changing it like this: "Coke" instead of Coke.

edited Oct 2, 2018 at 21:48

answered May 22, 2018 at 14:56

Chris

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13 Comments

Gurjit Singh Over a year ago

but what if I want that for "ItemQuant" to get the quantity for my status bar? its returning 0 for that

Chris Over a year ago

@GurjitSingh I have updated answer to make it more generalisable. Just change string "ItemName" to "ItemQuant". Note that this will count the number of elements that have an item quantity, not the total combined quantity. Do you need the total quantity added together?

Gurjit Singh Over a year ago

actually I need total number of quantity to display for number of items in cart

Chris Over a year ago

By the way, my code uses the ternary conditional operator and nil coalescing operator, which are very useful. You can find more information here: developer.apple.com/library/content/documentation/Swift/…

Chris Over a year ago

@GurjitSingh I thought you would know about it, but I gave more info just in case :)

|

Ankit Jayaswal · Accepted Answer · 2018-05-22 14:30:00Z

1

You have the array of dictionary:

var cartArrayDict = [[String:Any]]()

You need to map the cartArrayDict to get array of ItemName :

let itemNames: [String] = cartArrayDict.map( { $0["ItemName"] }) as? [String]

To remove duplicate values just pass it into Set and reconvert into array:

let itemNameArray = Array(Set(itemNames))

In total, You can find out the ItemNameArray as:

    let cartArrayDict = [
        ["ItemName": "Cheese Burger", "ItemPrice": 50, "ItemQuant": "2"],
        ["ItemName": "Veg Burger", "ItemPrice": 30, "ItemQuant": 0],
        ["ItemName": "Chicken Burger", "ItemPrice": 50, "ItemQuant": 0],
        ["ItemName": "Veg & Crisp Burger", "ItemPrice": 45, "ItemQuant": 0],
        ["ItemName": "Coke", "ItemPrice": 60, "ItemQuant": 0],
        ["ItemName": "Coke", "ItemPrice": 50, "ItemQuant": 0],
        ["ItemName": "Pepsi", "ItemPrice": 50, "ItemQuant": 0]
    ]

    if let itemsArr = cartArrayDict.map( { $0["ItemName"] }) as? [String] {
        let itemNameArray = Array(Set(itemsArr))
        print(itemNameArray)
    }

    // Result: ["Veg Burger", "Chicken Burger", "Pepsi", "Cheese Burger", "Coke", "Veg & Crisp Burger"]

edited May 22, 2018 at 14:30

answered May 22, 2018 at 14:10

Ankit Jayaswal

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3 Comments

Warren Burton Over a year ago

Please don't use force unwrap ! in an Swift answer especially to a beginner. Take the time to provide a non-lethal answer. Thanks

Ankit Jayaswal Over a year ago

@Moritz, I think user wants the total number of ItemName in the line "how can i count the total number of keyValues for "ItemName".

Ankit Jayaswal Over a year ago

@Moritz, updated the code for force unwrapping ! and converted the Set to Array again

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