opt some

src/hi/sku.go

@@ -0,0 +1,4 @@
+package hi
+
+func init() {
+}

src/sku.go

@@ -0,0 +1,25 @@
+package main
+
+import "fmt"
+
+func helper(chunks [][]string, chunkIndex int, prev []string, res [][]string) [][]string {
+	chunk := chunks[chunkIndex]
+	isLast := chunkIndex == len(chunks)-1
+	for _, val := range chunk {
+		if cur := append(prev, val); isLast {
+			res = append(res, cur)
+		} else {
+			res = helper(chunks, chunkIndex+1, cur, res)
+		}
+	}
+	return res
+}
+func combine(chunks ...[]string) (res [][]string) {
+	return helper(chunks, 0, []string{}, res)
+}
+func main() {
+	names := []string{"iPhone X", "iPhone XS"}
+	colors := []string{"黑色", "白色"}
+	storage := []string{"64g", "256g"}
+	fmt.Println(combine(names, colors, storage))
+}