Given 2 arrays of integer (A and B) find the elements from A not belonging to B. Swift implementation.

gistfile1.swift

import UIKit

let a = [1, 2, 3, 4, 5, 6, 7, 50, 30]
let b = [3, 10, 5, 6, 7, 8, 9, 51, 1]
var filter = [Int]()

for number in a {
    if !contains(b, number) {
        filter.append(number)
    }
}

print(filter)
// Returns [2, 4, 50, 30]