Исходники и презентации

lessons/slices_and_arrays/slice_clearing/main.go

@@ -0,0 +1,25 @@
+package main
+
+import "fmt"
+
+func main() {
+	// remove all elements
+	first := []int{1, 2, 3, 4, 5}
+	first = nil
+	fmt.Println("first: ", first, " : ", len(first), " : ", cap(first))
+
+	// keep allocated memory
+	second := []int{1, 2, 3, 4, 5}
+	second = second[:0]
+	fmt.Println("second:", second, " : ", len(second), " : ", cap(second))
+
+	// zero out all elements
+	third := []int{1, 2, 3, 4, 5}
+	clear(third)
+	fmt.Println("third: ", third, " : ", len(third), " : ", cap(third))
+
+	// zero two elements
+	fourth := []int{1, 2, 3, 4, 5}
+	clear(fourth[1:3])
+	fmt.Println("fourth:", fourth, " : ", len(fourth), " : ", cap(fourth))
+}