add: new tictactoe game

add: testing to tictactoe

rename: tictactoe

add: tictactoe steps

refactor: tictactoe const names

refactor: tictactoe loop

add: tictactoe bad switch example (fallthrough)

refactor: tictactoe loop skin

remove: tictactoe changable skin

refactor: tictactoe all

remove: tictactoe unnecessary base dir

add: tictactoe slices

add: tictactoe slices

remove: tictactoe fallthrough

rename: tictactoe slices 10 -> 09

update: loops skin tictactoe

add: tictactoe randomization

add: tictactoe infinite loop and labeled break

refactor: tictactoe rand and infinite loop

add: tictactoe buggy winning algo

add: tictactoe more tests

rename: tictactoe wrongPlay to wrongMove

add: tictactoe even more tests

fix: tictactoe

rename: tictactoe waitForInput to wait

add: tictactoe os.args gameSpeed

remove: tictactoe unnecessary files

rename: tictactoe game messages

refactor: tictactoe main loop

add: types and arrays

x-tba/tictactoe-experiments/05-with-pointers/main.go

@@ -0,0 +1,166 @@
+package main
+
+import (
+	"bufio"
+	"fmt"
+	"os"
+	"strconv"
+	"strings"
+)
+
+func main() {
+	fmt.Println(`
+~~~~~~~~~~~~~~~
+  TIC~TAC~TOE 
+~~~~~~~~~~~~~~~`)
+
+	loop(bufio.NewScanner(os.Stdin))
+}
+
+const (
+	// skin options :-)
+	emptyMark = "☆"
+	mark1     = "💀"
+	mark2     = "🎈"
+
+	maxTurn = 9
+)
+
+type game struct {
+	board  [][]string
+	turn   int
+	player string
+
+	buf strings.Builder
+}
+
+func loop(in *bufio.Scanner) {
+	g := newGame()
+
+	for {
+		g.prompt()
+
+		if !in.Scan() {
+			break
+		}
+
+		// Atoi already return 0 on error; no need to check
+		// it for the following switch to work
+		pos, _ := strconv.Atoi(in.Text())
+
+		msg := g.play(pos)
+		if msg != "" {
+			fmt.Println("\n>>>", msg)
+			continue
+		}
+
+		if msg := g.finito(); msg != "" {
+			fmt.Printf("\n%s%s\n", g, msg)
+			break
+		}
+
+		g.next()
+	}
+}
+
+func newGame() *game {
+	return &game{
+		player: mark1,
+		board: [][]string{
+			{emptyMark, emptyMark, emptyMark},
+			{emptyMark, emptyMark, emptyMark},
+			{emptyMark, emptyMark, emptyMark},
+		},
+	}
+}
+
+func (g *game) prompt() {
+	fmt.Printf("\n%s%s [1-9]: ", g, g.player)
+}
+
+func (g *game) String() string {
+	g.buf.Reset()
+
+	g.buf.WriteRune('\n')
+	g.buf.WriteString("---+----+---\n")
+
+	for _, line := range g.board {
+		g.buf.WriteString(strings.Join(line, "  | "))
+		g.buf.WriteRune('\n')
+
+		g.buf.WriteString("---+----+---\n")
+	}
+
+	return g.buf.String()
+}
+
+func (g *game) play(pos int) string {
+	var row int
+
+	switch {
+	case pos >= 7 && pos <= 9:
+		row = 2
+	case pos >= 4 && pos <= 6:
+		row = 1
+	case pos >= 1 && pos <= 3:
+		row = 0
+	default:
+		return "wrong position"
+	}
+
+	col := pos - row*3 - 1
+
+	if g.board[row][col] != emptyMark {
+		return "already played!"
+	}
+
+	// put the player
+	g.board[row][col] = g.player
+
+	return ""
+}
+
+func (g *game) finito() string {
+	g.turn++
+
+	switch {
+	case g.won():
+		return fmt.Sprintf("WINNER: %s", g.player)
+	case g.turn == maxTurn:
+		return "TIE!"
+	}
+	return ""
+}
+
+func (g *game) won() (won bool) {
+	for _, m := range [2]string{mark1, mark2} {
+		b, mmm := g.board, strings.Repeat(m, 3)
+
+		won = /* horizontals */
+			strings.Join(b[0], "") == mmm ||
+				strings.Join(b[1], "") == mmm ||
+				strings.Join(b[2], "") == mmm ||
+
+				/* verticals */
+				b[0][0]+b[1][0]+b[2][0] == mmm ||
+				b[0][1]+b[1][1]+b[2][1] == mmm ||
+				b[0][2]+b[1][2]+b[2][2] == mmm ||
+
+				/* diagonals */
+				b[0][0]+b[1][1]+b[2][2] == mmm ||
+				b[0][2]+b[1][1]+b[2][0] == mmm
+
+		if won {
+			return true
+		}
+	}
+	return false
+}
+
+func (g *game) next() {
+	if g.player == mark1 {
+		g.player = mark2
+	} else {
+		g.player = mark1
+	}
+}