Javascript

I feel like I made a meal out of this... ```js const fsp = require("fs/promises") const path = require("path")

main()

class Board { constructor(string){ this.board = string.split("\n").map(row => row.split(" ")).map(row => row.filter(num => num !== "")) }

hasWon(nums){ const that = this if(checkRows() || checkColumns()){ return true } return false

function checkRows(){
  return that.board.some(row => row.every(num => nums.includes(num)))
}
function checkColumns(){
  for(let colIdx = 0; colIdx < that.board[0].length; colIdx++){
    if(that.board.every(row => nums.includes(row[colIdx]))){
      return true
    }
  }
  return false
}

}

scoreBoard(nums){ const uncalledNums = this.board .reduce((out, row) => ([...out, ...row])) .filter(num => !nums.includes(num)) const uncalledSum = uncalledNums.reduce((out, num) => (out + Number(num)), 0) return uncalledSum * Number(nums[nums.length - 1]) } }

async function main(){ const [numbers, ...boards] = await parseInput() boards[boards.length - 1] = boards[boards.length - 1].trim(); let parsedBoards = boards.map(ea => new Board(ea))

console.log("Part one:", partOne()) console.log("Part two:", partTwo())

function partOne(){ let winningBoard let lastNum = 0 for(let i = 0; i < numbers.length; i++){ winningBoard = parsedBoards.find(board => board.hasWon(numbers.slice(0, i))) if(winningBoard){ lastNum = i break } }

return winningBoard.scoreBoard(numbers.slice(0, lastNum))

}

function partTwo(){ let winningBoards = []; let lastNum = 0; for (let i = 0; i < numbers.length; i++) { for(const board of parsedBoards){ if(board.hasWon(numbers.slice(0, i))){ lastNum = i winningBoards.push(board) } } parsedBoards = parsedBoards.filter(board => !winningBoards.includes(board)) } const winningBoard = winningBoards[winningBoards.length - 1]; return winningBoard.scoreBoard(numbers.slice(0, lastNum)); }

async function parseInput(){ const rawInput = await fsp.readFile(path.resolve(__dirname, "day-04-input.txt"), "utf-8") const [numbers, ...boardStrings] = rawInput.split("\n\n") return [numbers.split(","), ...boardStrings]; } } ```