Sorting 2 arrays the same way in swift

Question

I have an array for item names, and another for item prices. I want to sort the prices from least to greatest, but have the appropriate items and the prices be at the same index.

For example: [9, 4, 1] & ["item 1", "item 2", "item 3"] -> [1, 4, 9] & ["item 3", "item 2", "item 1"]

Any idea how i could do this efficiently for large arrays?

See answer to same question here : stackoverflow.com/questions/35273805/… — Alain T.
– Alain T., Commented Apr 22, 2017 at 20:37

Luca Angeletti · Accepted Answer · 2017-04-22 18:34:05Z

1

Given

let prices = [9, 4, 1]
let names = ["item 1", "item 2", "item 3"]

Solution #1

You can

let sorted = zip(prices, names).sorted { $0.0 < $1.0 }

let sortedPrices = sorted.map { $0.0 } // [1, 4, 9]
let sortedNames = sorted.map { $0.1 } // ["item 3", "item 2", "item 1"]

Solution #2

You should really use a model value.

let prices = [9, 4, 1]
let names = ["item 1", "item 2", "item 3"]

struct Item {
    let name: String
    let price: Int
}

let sortedItems = zip(names, prices).map(Item.init).sorted { $0.price < $1.price }

// [Item(name: "item 3", price: 1), Item(name: "item 2", price: 4), Item(name: "item 1", price: 9)]

answered Apr 22, 2017 at 18:34

Luca Angeletti

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