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swiftdictionaryswap

how to swap items in Dictionary

I have Dictionary like this 

let test = ["first":1,"second":2,"third":3]

I want to swap first item to the third item like this 

let test = ["third":3,"second":2,"first":1]

how can I swap item?

Solution

  • Dictionaries in Swift are an unordered collection type. The order in which the values will be returned cannot be determined.

    You can use sorted(by:) method to sort the dictionaries. The result type will be array of tuples.

    let test = ["first":1,"second":2,"third":3]
//let result = test.sorted { $0.key > $1.key }
let result = test.sorted { item1, item2 in
    return item1.key > item2.key
}
print(result)//[(key: "third", value: 3), (key: "second", value: 2), (key: "first", value: 1)]