Shorter ver:
const isValid = (board: string[][], guess: string, prevCoords?: [number, number]) => { if (guess === '') return true; if (!prevCoords) { const coords = [].concat(...board.map((row, r) => row.map((val, c) => [r, c]))); return coords.some(c => isValid(board, guess, c)); } else { if (board[prevCoords[0]][prevCoords[1]] !== guess[0]) return false; const temp = board[prevCoords[0]][prevCoords[1]]; board[prevCoords[0]][prevCoords[1]] = '*'; const answer = [ [prevCoords[0] - 1, prevCoords[1] - 1], [prevCoords[0] - 1, prevCoords[1] ], [prevCoords[0] - 1, prevCoords[1] + 1], [prevCoords[0] , prevCoords[1] - 1], [prevCoords[0] , prevCoords[1] + 1], [prevCoords[0] + 1, prevCoords[1] - 1], [prevCoords[0] + 1, prevCoords[1] ], [prevCoords[0] + 1, prevCoords[1] + 1] ] .filter(([r, c]) => r >= 0 && c >= 0 && r < board.length && c < board[0].length) .some(([r, c]) => isValid(board, guess.substring(1), [r, c])); board[prevCoords[0]][prevCoords[1]] = temp; return answer; } } const testBoard = [ ["I","L","A","W"], ["B","N","G","E"], ["I","U","A","O"], ["A","S","R","L"] ]; const testWords = ['BINGO', 'LINGO', 'ILNBIA', 'BUNGIE', 'BINS', 'SINUS']; for (const word of testWords) { console.log(word, isValid(testBoard, word)); }
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Shorter ver: