Question

How to check whether a non-sequential list is a subset of another non-sequential list in Swift

Answer 1

import Foundation

func isSubset(array1: [Int], array2: [Int]) -> Bool {
    // Convert array1 to a Set for efficient lookup
    let set1 = Set(array1)
    
    // Check if all elements of array2 exist in set1
    return array2.allSatisfy { set1.contains($0) }
}

let array1 = [5, 1, 8, 12, 40, 7, 9, 100] // Main array
let array2 = [8, 40, 9, 1]                // Subset array

if isSubset(array1: array1, array2: array2) {
    print("Yes, array2 is a subset of array1")
} else {
    print("No, array2 is not a subset of array1")
}


 
 
/*
run:

Yes, array2 is a subset of array1
 
*/

 

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