question_2.ts

// you can write to stdout for debugging purposes, e.g.
// console.log('this is a debug message');

const columns = ["A", "B", "C", "D", "E", "F", "G", "H", "J", "K"];

const aisles = {};

interface Seat {
  id: string;
  taken: boolean;
}

function makeSeat(row: number, columnLetter: string, taken: boolean) {
  const seat: Seat = {
    id: `${row}${columnLetter}`,
    taken
  };
  return seat;
}

function getAisle(columnLetter: string): number {
  if (["A", "B", "C"].includes(columnLetter)) {
    return 1;
  }
  if (["D", "E", "F", "G"].includes(columnLetter)) {
    return 2;
  }
  if (["H", "J", "K"].includes(columnLetter)) {
    return 3;
  }
  throw new Error("bad column letter");
}

function makeRow(rowNumber: number) {
  return columns.map(c => makeSeat(rowNumber, c, false));
}

function canSeatFamily(row: Seat[]): boolean {
  return row.map(r => r.taken).some(r => r === true);
}

function countFamiliesPerRowV2(row: Seat[]): number {
  const _row = row.map(r => r);
  _row.pop();
  _row.shift();

  const canSeatTwo = !canSeatFamily(_row);
  const first4 = !canSeatFamily(_row.slice(0, 4));
  const last4 = !canSeatFamily(_row.slice(4));
  const middle = !canSeatFamily(_row.slice(2, 6));

  if (canSeatTwo) {
    return 2;
  } else if (first4 || last4 || middle) {
    return 1;
  } else {
    return 0;
  }
}

function solution(numberOfRows: number, taken: string): number {
  //create rows
  const rows: Seat[][] = [];
  for (let i = 1; i <= numberOfRows; i++) {
    rows.push(makeRow(i));
  }

  // figure out which seats are taken
  const seatsTaken = taken.split(" ");

  rows.forEach(row => {
    row.forEach(seat => {
      if (seatsTaken.includes(seat.id)) {
        seat.taken = true;
      }
    });
  });

  return rows.reduce((total, row) => {
    return total + countFamiliesPerRowV2(row);
  }, 0);
}