Snakes and Ladders (aka chutes and ladders) game

snakes-and-ladders.js

const range = (limit = 0) => [...Array(limit)].map((_, i) => i)
const random = (down = 0, up = 0) => Math.floor(Math.random() * (up - down + 1))

class Player {
	position = 0;

	constructor(name) {
		this.name = name;
	}

	move(next) {
		this.position += next;
	}

	climb(up) {
		this.move(up);
	}

	fall(down) {
		this.position -= down;
	}
}

class Game {
	state = 'notStarted';

	constructor(players = 2) {
		this.board = range(100).reduce((acc, curr) => {
			if (curr === 4) {
				acc[curr] = 25;
			} else if (curr === 13) {
				acc[curr] = 46;
			} else if (curr === 33) {
				acc[curr] = 49;
			} else if (curr === 42) {
				acc[curr] = 63;
			} else if (curr === 50) {
				acc[curr] = 69;
			} else if (curr === 62) {
				acc[curr] = 81;
			} else if (curr === 74) {
				acc[curr] = 92;
			} else if (curr === 27) {
				acc[curr] = -4;
			} else if (curr === 40) {
				acc[curr] = -3;
			} else if (curr === 43) {
				acc[curr] = -18;
			} else if (curr === 53) {
				acc[curr] = -31;
			} else if (curr === 65) {
				acc[curr] = -45;
			} else if (curr === 76) {
				acc[curr] = -58;
			} else if (curr === 91) {
				acc[curr] = -53;
			} else if (curr === 99) {
				acc[curr] = -41;
			} else {
				acc[curr] = curr;
			}

			return acc;
		}, {});

		this.players = range(1, players + 1).reduce((acc, cur) => {
			acc[cur] = new Player(cur);
			return acc;
		}, {});
	}

	roll() {
		return random(1, 6);
	}

	play(player) {
		this.state = 'playing';

		console.log('Player: %d', player);

		// window.confirm();

		const dice = this.roll();
		console.log(`${player} rolled: ${dice}`);

		const currentPlayer = this.players[player];
		const playerPosition = this.board[currentPlayer.position];
		console.log(`${player} in: ${playerPosition}`);

		const nextPosition = playerPosition ? this.board[playerPosition + dice] : dice;
		console.log(`${player} next: ${nextPosition}`);

		if (nextPosition === 100) {
			this.state = 'over';
			return console.log('%o is the winner', currentPlayer);
		}

		if (nextPosition > 0) {
			currentPlayer.move(dice);
		} else {
			currentPlayer.fall(Math.abs(dice));
		}

		if (dice === 6) {
			this.play(player);
		}
	}
}

let turn = 1;
let round = 0;
const players = 2;
const game = new Game(players);

while (game.state !== 'over') {
	console.log('========= Start ====================');
	console.log(`Round: ${Math.floor(round / 2)}, player's ${turn}, turn`);
	game.play(turn);

	if (turn === 1) {
		turn = 2;
	} else {
		turn = 1;
	}

	round++;
	console.log('=========== End ==================');
}