update: directory structure

advfuncs/07-deferred-funcs/main.go

@@ -0,0 +1,68 @@
+// For more tutorials: https://blog.learngoprogramming.com
+//
+// Copyright © 2018 Inanc Gumus
+// Learn Go Programming Course
+// License: https://creativecommons.org/licenses/by-nc-sa/4.0/
+//
+
+package main
+
+import (
+	"fmt"
+	"time"
+)
+
+func main() {
+	// single()
+	// stacked()
+	findTheMeaning()
+}
+
+func findTheMeaningNoDefer() {
+	start := time.Now()
+	fmt.Printf("%s starts...\n", "findTheMeaning")
+
+	// do some heavy calculation...
+	time.Sleep(time.Second * 2)
+
+	fmt.Printf("%s took %v\n", "findTheMeaning", time.Since(start))
+}
+
+func findTheMeaning() {
+	defer measure("findTheMeaning")()
+
+	// do some heavy calculation
+	time.Sleep(time.Second * 2)
+}
+
+func measure(name string) func() {
+	start := time.Now()
+	fmt.Printf("%s starts...\n", name)
+
+	return func() {
+		fmt.Printf("%s took %v\n", name, time.Since(start))
+	}
+}
+
+func stacked() {
+	for count := 1; count <= 5; count++ {
+		defer fmt.Println(count)
+	}
+
+	fmt.Println("the stacked func returns")
+}
+
+func single() {
+	var count int
+
+	// defer func() {
+	// 	fmt.Println(count)
+	// }()
+	defer fmt.Println(count)
+
+	count++
+	// fmt.Println(count)
+
+	// the defer runs here
+	// fmt.Println(count)
+}