Question

How to combine 2 maps into a third map in Swift

Answer 1

import Foundation

let map1 = ["a": 1, "b": 2]
let map2 = ["b": 999, "c": 4, "d": 5]

let combined = map1.merging(map2) { (_, new) in new }

print(combined)




/*
run:

["c": 4, "b": 999, "a": 1, "d": 5]

*/

 

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Answer 2

import Foundation

let map1 = ["a": 1, "b": 2]
let map2 = ["b": 999, "c": 4, "d": 5]

let combined = map1.merging(map2) { old, new in old + new }

print(combined)




/*
run:

["d": 5, "c": 4, "a": 1, "b": 1001]

*/

 

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