152 lines
3.0 KiB
Go
152 lines
3.0 KiB
Go
// Copyright © 2018 Inanc Gumus
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// Learn Go Programming Course
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// License: https://creativecommons.org/licenses/by-nc-sa/4.0/
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//
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// For more tutorials : https://learngoprogramming.com
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// In-person training : https://www.linkedin.com/in/inancgumus/
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// Follow me on twitter: https://twitter.com/inancgumus
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// ---------------------------------------------------------
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// EXERCISE: Refactor the game store to funcs - step #1
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//
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// Remember the game store program from the structs exercises?
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// Now, it's time to refactor it to funcs.
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//
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// Create games.go file
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//
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// 1- Move the structs there
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//
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// 2- Add a func that creates and returns a game.
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//
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// Name : newGame
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// Inputs: id, price, name and genre
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// Output: game
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//
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// 3- Add a func that adds a `game` to `[]game` and returns `[]game`:
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//
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// Name : addGame
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// Inputs: []game, game
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// Output: []game
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//
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// 4- Add a func that uses newGame and addGame funcs to load up the game
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// store:
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//
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// Name : load
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// Inputs: none
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// Output: []game
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//
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// 5- Add a func that indexes games by ID:
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//
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// Name : indexByID
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// Inputs: []game
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// Output: map[int]game
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//
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// 6- Add a func that prints the given game:
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//
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// Name : printGame
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// Inputs: game
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//
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//
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// Go back to main.go and change the existing code with
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// the new funcs that you've created. There are hints
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// inside the code.
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//
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// ---------------------------------------------------------
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package main
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import (
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"bufio"
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"fmt"
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"os"
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"strconv"
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"strings"
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)
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func main() {
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type item struct {
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id int
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name string
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price int
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}
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type game struct {
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item
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genre string
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}
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// load()
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games := []game{
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{
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item: item{id: 1, name: "god of war", price: 50},
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genre: "action adventure",
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},
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{item: item{id: 2, name: "x-com 2", price: 40}, genre: "strategy"},
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{item: item{id: 3, name: "minecraft", price: 20}, genre: "sandbox"},
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}
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// indexByID()
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byID := make(map[int]game)
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for _, g := range games {
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byID[g.id] = g
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}
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fmt.Printf("Inanc's game store has %d games.\n", len(games))
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in := bufio.NewScanner(os.Stdin)
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for {
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fmt.Printf(`
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> list : lists all the games
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> id N : queries a game by id
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> quit : quits
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`)
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if !in.Scan() {
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break
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}
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fmt.Println()
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cmd := strings.Fields(in.Text())
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if len(cmd) == 0 {
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continue
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}
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switch cmd[0] {
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case "quit":
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fmt.Println("bye!")
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return
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case "list":
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for _, g := range games {
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// printGame()
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fmt.Printf("#%d: %-15q %-20s $%d\n",
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g.id, g.name, "("+g.genre+")", g.price)
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}
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case "id":
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if len(cmd) != 2 {
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fmt.Println("wrong id")
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continue
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}
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id, err := strconv.Atoi(cmd[1])
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if err != nil {
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fmt.Println("wrong id")
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continue
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}
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g, ok := byID[id]
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if !ok {
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fmt.Println("sorry. i don't have the game")
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continue
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}
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// printGame()
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fmt.Printf("#%d: %-15q %-20s $%d\n",
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g.id, g.name, "("+g.genre+")", g.price)
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}
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}
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}
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