Исходники и презентации

lessons/generics_and_reflection/map_keys/main.go

@@ -0,0 +1,26 @@
+package main
+
+func GetKeys(data map[string]int) []string {
+	keys := make([]string, 0, len(data))
+	for key := range data {
+		keys = append(keys, key)
+	}
+
+	return keys
+}
+
+// any -> alias for interface{}
+// comparable -> constraint for != and ==
+func GetKeysGeneric[K comparable, V any](data map[K]V) []K {
+	keys := make([]K, 0, len(data))
+	for key := range data {
+		keys = append(keys, key)
+	}
+
+	return keys
+}
+
+func main() {
+	GetKeys(map[string]int{})
+	GetKeysGeneric[int, int](map[int]int{})
+}