first commit

pkg/tools/list.go

@@ -0,0 +1,26 @@
+package tools
+
+func ListToMap[K comparable, S any](list []S, keyFunc func(S) K) map[K]S {
+	if len(list) == 0 {
+		return make(map[K]S)
+	}
+	result := make(map[K]S, len(list))
+	for _, item := range list {
+		key := keyFunc(item)
+		result[key] = item
+	}
+	return result
+}
+func SliceToMapList[K comparable, V any](slice []V, keyFunc func(V) K) map[K][]V {
+	result := make(map[K][]V)
+	for _, v := range slice {
+		key := keyFunc(v)
+		if _, ok := result[key]; !ok {
+			result[key] = make([]V, 0)
+			result[key] = append(result[key], v)
+		} else {
+			result[key] = append(result[key], v)
+		}
+	}
+	return result
+}