I Built a Typing Game in Go

Thanks to Mercari’s generosity, there was an announcement of a limited-time public release of “Complete Introduction to the Go Programming Language,” so I dove right in!

What I found really nice is that for each chapter, you get to write code in a hands-on style based on what you’ve learned and try out the usage right away.

So I built a typing game in Go, which was one of the exercises there ♪

It’s a game where you type the words presented within a time limit, and your score goes up each time you get one right.

GitHub - kenzo0107/typing-game-go: Typing Game

Typing Game. Contribute to kenzo0107/typing-game-go development by creating an account on GitHub.

What I Did

Presenting the Words

Use tjarratt/babble to fetch a random word to present and print it to standard output.

import (
  ...
	"github.com/tjarratt/babble"
)

func init() {
  ...
  babbler = babble.NewBabbler()
  babbler.Count = 1 // 1ワードに設定.
}

// 出題
func q() {
	question = babbler.Babble()
	fmt.Println("\ntype this: ", question)
	fmt.Print("> ")
}

Countdown Before the Game Starts

func _main() {
	// ゲーム開始前の 3,2,1 Go 表示
  countdown()
  ...
}

func countdown() {
	for i := 3; i > 0; i-- {
		fmt.Print(i)
		fmt.Print(" ")
		time.Sleep(time.Second)
	}
	fmt.Println("Go !")
}

Timeout Handling with context.WithTimeout

Using the for-select pattern, channels are created indefinitely so they can be received.
Time limit.

// タイムアウト処理付き context
bc := context.Background()
ctx, cancel := context.WithTimeout(bc, d)
defer cancel()

...

for {
		select {
    case <-ctx.Done():  // タイムアウト
        fmt.Println("\n\ntime up !")
			  fmt.Println("score:", score)
        return
    ...
    }
}

Reading a String from Standard Input and Sending It to a chan

Since the for-select pattern is waiting, the process of reading a string from standard input is issued indefinitely.
The timeout context cuts these off so that they can no longer run.

func input(r io.Reader) <-chan string {
	ch := make(chan string)
	go func() {
		// 標準入力から一行ずつ文字を読み込む
		s := bufio.NewScanner(r)
		for s.Scan() {
			ch <- s.Text()
		}
		close(ch)
	}()
	return ch
}

Things I’d Like to Try!

• I want to play sounds during the game
• Like in PC typing games, I want to make enemies appear and have them take damage each time you type correctly

These are the kinds of things I’d like to try with Go.

Is this where ebiten comes in!?

I’ll keep going with the introduction ♪

That’s all.
I hope you find this helpful.