add: more exercises to funcs

25-functions/exercises/refactor-to-funcs-3/main.go

@@ -0,0 +1,61 @@
+// 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/
+//
+
+// ---------------------------------------------------------
+// EXERCISE: Refactor the game store to funcs - step #3
+//
+//  Let's continue from the previous exercise. This time,
+//  you're going to add json encoding and decoding using
+//  funcs.
+//
+//  1- Create a new command in a func that encodes the
+//     game store data to json and terminates the program.
+//     Lastly, add it to runCmd func.
+//
+//     For more information, see: "Encode" exercise from
+//     the structs section.
+//
+//        Name  : cmdSave
+//        Inputs: []game
+//        Output: bool
+//
+//  2- Refactor the load() to load the games from the
+//     `data` constant (it's in the games.go as well).
+//
+//     For more information, see: "Decode" exercise from
+//     the structs section.
+//
+// ---------------------------------------------------------
+
+package main
+
+import (
+	"bufio"
+	"fmt"
+	"os"
+)
+
+func main() {
+	games := load()
+	byID := indexByID(games)
+
+	fmt.Printf("Inanc's game store has %d games.\n", len(games))
+
+	in := bufio.NewScanner(os.Stdin)
+	for {
+		fmt.Printf(`
+  > list   : lists all the games
+  > id N   : queries a game by id
+  > quit   : quits
+
+`)
+
+		if !in.Scan() || !runCmd(in.Text(), games, byID) {
+			break
+		}
+	}
+}