minesweeper.js

const BOMB = -1;
const BLANK = 0;

function generateMap(width, height, bombCount)
{
	const map = Array.from(new Array(height), () => Array.from(new Array(width), () => 0));

	for(let i = 0; i < bombCount; ) {
		const posX = Math.floor(Math.random() * width);
		const posY = Math.floor(Math.random() * height);

		if(map[posY][posX] !== BOMB) {
			map[posY][posX] = BOMB;
			i++;
		}
	}
	
	for(let y = 0; y < height; y++) {
		for(let x = 0; x < width; x++) {
			if(map[y][x] === BOMB) {
				continue;
			}

			for(let i = y - 1; i <= y + 1; i++) {
				for(let j = x - 1; j <= x + 1; j++) {
					if(i >= 0 && i < height && j >= 0 && j < width) {
						if(map[i][j] === BOMB) {
							map[y][x]++;
						}
					}
				}
			}
		}
	}
	
	return map;
}

function mapToDiscordString(map)
{
	return map.map(row => `||:${row.map(cell => (cell === BOMB) ? 'bomb' : ['zero', 'one', 'two', 'three', 'four', 'five', 'six', 'seven', 'eight'][cell]).join(':||||:')}:||`).join("\n");
}

const width = 9;
const height = 9;
const bombCount = 10;

if(width * height < bombCount) {
	console.log('爆弾の数がマス目の数よりも多いです');
	process.exit(1);
}

console.log(mapToDiscordString(generateMap(width, height, bombCount)));