let array = [0, 1, 2, 3, 4] let array0 = [0, 1, 2, 3, 4].compactMap { $0.isMultiple(of: 2) ? $0 : nil } print(array0) let array1 = array.compactMap { $0.isMultiple(of: 2) ? $0 : nil } print(array1) let array2 = [0, 1, 2, 3, 4].compactMap { if $0.isMultiple(of: 2) { $0 } else { nil } } print(array2)