151 lines
2.8 KiB
Go
151 lines
2.8 KiB
Go
|
// 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 #1
|
||
|
|
//
|
||
|
|
// Remember the game store program from the structs exercises?
|
||
|
|
// Now, it's time to refactor it to funcs.
|
||
|
|
//
|
||
|
|
// Create games.go file
|
||
|
|
//
|
||
|
|
// 1- Move the structs there
|
||
|
|
//
|
||
|
|
// 2- Add a func that creates and returns a game.
|
||
|
|
//
|
||
|
|
// Name : newGame
|
||
|
|
// Inputs: id, price, name and genre
|
||
|
|
// Output: game
|
||
|
|
//
|
||
|
|
// 3- Add a func that adds a `game` to `[]game` and returns `[]game`:
|
||
|
|
//
|
||
|
|
// Name : addGame
|
||
|
|
// Inputs: []game, game
|
||
|
|
// Output: []game
|
||
|
|
//
|
||
|
|
// 4- Add a func that uses newGame and addGame funcs to load up the game
|
||
|
|
// store:
|
||
|
|
//
|
||
|
|
// Name : load
|
||
|
|
// Inputs: none
|
||
|
|
// Output: []game
|
||
|
|
//
|
||
|
|
// 5- Add a func that indexes games by ID:
|
||
|
|
//
|
||
|
|
// Name : indexByID
|
||
|
|
// Inputs: []game
|
||
|
|
// Output: map[int]game
|
||
|
|
//
|
||
|
|
// 6- Add a func that prints the given game:
|
||
|
|
//
|
||
|
|
// Name : printGame
|
||
|
|
// Inputs: game
|
||
|
|
//
|
||
|
|
//
|
||
|
|
// Go back to main.go and change the existing code with
|
||
|
|
// the new funcs that you've created. There are hints
|
||
|
|
// inside the code.
|
||
|
|
//
|
||
|
|
// ---------------------------------------------------------
|
||
|
|
|
||
|
|
package main
|
||
|
|
|
||
|
|
import (
|
||
|
|
"bufio"
|
||
|
|
"fmt"
|
||
|
|
"os"
|
||
|
|
"strconv"
|
||
|
|
"strings"
|
||
|
|
)
|
||
|
|
|
||
|
|
func main() {
|
||
|
|
type item struct {
|
||
|
|
id int
|
||
|
|
name string
|
||
|
|
price int
|
||
|
|
}
|
||
|
|
|
||
|
|
type game struct {
|
||
|
|
item
|
||
|
|
genre string
|
||
|
|
}
|
||
|
|
|
||
|
|
// load()
|
||
|
|
games := []game{
|
||
|
|
{
|
||
|
|
item: item{id: 1, name: "god of war", price: 50},
|
||
|
|
genre: "action adventure",
|
||
|
|
},
|
||
|
|
{item: item{id: 2, name: "x-com 2", price: 40}, genre: "strategy"},
|
||
|
|
{item: item{id: 3, name: "minecraft", price: 20}, genre: "sandbox"},
|
||
|
|
}
|
||
|
|
|
||
|
|
// indexByID()
|
||
|
|
byID := make(map[int]game)
|
||
|
|
for _, g := range games {
|
||
|
|
byID[g.id] = g
|
||
|
|
}
|
||
|
|
|
||
|
|
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() {
|
||
|
|
break
|
||
|
|
}
|
||
|
|
|
||
|
|
fmt.Println()
|
||
|
|
|
||
|
|
cmd := strings.Fields(in.Text())
|
||
|
|
if len(cmd) == 0 {
|
||
|
|
continue
|
||
|
|
}
|
||
|
|
|
||
|
|
switch cmd[0] {
|
||
|
|
case "quit":
|
||
|
|
fmt.Println("bye!")
|
||
|
|
return
|
||
|
|
|
||
|
|
case "list":
|
||
|
|
for _, g := range games {
|
||
|
|
// printGame()
|
||
|
|
fmt.Printf("#%d: %-15q %-20s $%d\n",
|
||
|
|
g.id, g.name, "("+g.genre+")", g.price)
|
||
|
|
}
|
||
|
|
|
||
|
|
case "id":
|
||
|
|
if len(cmd) != 2 {
|
||
|
|
fmt.Println("wrong id")
|
||
|
|
continue
|
||
|
|
}
|
||
|
|
|
||
|
|
id, err := strconv.Atoi(cmd[1])
|
||
|
|
if err != nil {
|
||
|
|
fmt.Println("wrong id")
|
||
|
|
continue
|
||
|
|
}
|
||
|
|
|
||
|
|
g, ok := byID[id]
|
||
|
|
if !ok {
|
||
|
|
fmt.Println("sorry. i don't have the game")
|
||
|
|
continue
|
||
|
|
}
|
||
|
|
|
||
|
|
// printGame()
|
||
|
|
fmt.Printf("#%d: %-15q %-20s $%d\n",
|
||
|
|
g.id, g.name, "("+g.genre+")", g.price)
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|