Question

How to use compactMap to transform an array in Swift

Answer 1

func multiply (n: Int) -> Int {
    return n * 2
}

var arr = [4, 8, 1, 0, 2]

print(arr)

arr = arr.compactMap(multiply)

print(arr)



 
/*
run:
 
[4, 8, 1, 0, 2]
[8, 16, 2, 0, 4]
 
*/

 

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