Исходники и презентации

lessons/maps/map_clearing/main.go

@@ -0,0 +1,22 @@
+package main
+
+import "fmt"
+
+func main() {
+	// remove all elements
+	first := map[int]int{1: 1, 2: 2, 3: 3}
+	first = nil
+	fmt.Println(first, " : ", len(first))
+
+	// keep allocated memory
+	second := map[int]int{1: 1, 2: 2, 3: 3}
+	for key := range second {
+		delete(second, key)
+	}
+	fmt.Println(second, " : ", len(second))
+
+	// keep allocated memory
+	third := map[int]int{1: 1, 2: 2, 3: 3}
+	clear(third)
+	fmt.Println(third, " : ", len(third))
+}