Как из 2 массивов получить один комбинированный в Swift?

Question

[vanyaseverin]

Есть 2 массива:

var array1: [String] = ["l1", "m2", "r3"]
var array2: [String] = ["l4", "m5", "r6"]
var combinations: [[String]] = []

Нужно, объединить array1 и array2 так, чтобы combinations получился в итоге:

var combinations: [[String]] = [
["l1", "m2", "r3"], ["l1", "m5", "r3"], ["l1", "m5", "r6"], ["l1", "m2", "r6"],
["l4", "m2", "r3"], ["l4", "m5", "r3"], ["l4", "m5", "r6"], ["l4", "m2", "r6"]
]

Answer 1

[0xD34F]

let arrays: [[String]] = [array1, array2]
var combinations: [[String]] = []

let arraysLen: Int = arrays.count
let arrLen: Int = arrays[0].count
let numCombinations: Int = Int(pow(Double(arraysLen), Double(arrLen)))

for i in (0 ..< numCombinations) {
  var combination: [String] = []
  for j in (0 ..< arrLen) {
    let arrIndex: Int = i / Int(pow(Double(arraysLen), Double(j))) % arraysLen
    let elIndex: Int = arrLen - j - 1
    combination.insert(arrays[arrIndex][elIndex], at: 0)
  }
  combinations.append(combination)
}