Исходники и презентации

lessons/slices_and_arrays/empty_and_nil_slices/main.go

@@ -0,0 +1,27 @@
+package main
+
+import (
+	"fmt"
+	"unsafe"
+)
+
+func main() {
+	var data []string
+	fmt.Println("var data []string:")
+	fmt.Printf("\tempty=%t nil=%t size=%d data=%p\n", len(data) == 0, data == nil, unsafe.Sizeof(data), unsafe.SliceData(data))
+
+	data = []string(nil)
+	fmt.Println("data = []string(nil):")
+	fmt.Printf("\tempty=%t nil=%t size=%d data=%p\n", len(data) == 0, data == nil, unsafe.Sizeof(data), unsafe.SliceData(data))
+
+	data = []string{}
+	fmt.Println("data = []string{}:")
+	fmt.Printf("\tempty=%t nil=%t size=%d data=%p\n", len(data) == 0, data == nil, unsafe.Sizeof(data), unsafe.SliceData(data))
+
+	data = make([]string, 0)
+	fmt.Println("data = make([]string, 0):")
+	fmt.Printf("\tempty=%t nil=%t size=%d data=%p\n", len(data) == 0, data == nil, unsafe.Sizeof(data), unsafe.SliceData(data))
+
+	empty := struct{}{}
+	fmt.Println("empty struct address:", unsafe.Pointer(&empty))
+}