如何将一个数组中的元素与另一个数组中的每个元素组合

Question

我试图将一个数组中的元素与另一个数组中的每个元素组合在一起，我试图寻找一些解决方案，但我无法弄清楚。

以这两个数组为例：

num = [1,2,3]

let = ["a","b","c"]

我想将它们结合起来以获得：

combined = [[1, "a"], [1, "b"], [1, "c"], [2, "a"], [2, "b"], [2, "c"], 
            [3, "a"], [3, "b"], [3, "c"]]

Answer 1

您可以使用#product：

num = [1,2,3]
let = ["a","b","c"]

num.product let
#=>[[1, "a"], [1, "b"], [1, "c"], [2, "a"], [2, "b"], [2, "c"], [3, "a"], [3, "b"], [3, "c"]]