Advent of Code - Day 3

const data = $("pre").innerText.split("\n");
data.pop();

const toboggan = ([right, down]) => {
  let yPos = 0;
  let xPos = 0;
  let colLength = data.length - down;
  let rowLength = data[yPos].length - right;
  let result = [];

  for (let i = 0; i < data.length / down; i++) {
    result.push(data[yPos][xPos]);
    yPos += down;
    xPos >= rowLength ? (xPos -= rowLength) : (xPos += right);
  }

  return result.filter((item) => item === "#").length;
};

[
  [1, 1],
  [3, 1],
  [5, 1],
  [7, 1],
  [1, 2],
]
  .map((config) => toboggan(config))
  .reduce((a, b) => a * b, 1);