LadyBugs (Arrays)

function solve(input) {
  let size = Number(input.shift());
  let field = [];
  field.length = size;
  field.fill(0);

  const isValidIndex = (index, arr) => {
    return index >= 0 && index <= arr.length - 1;
  };

  const success = (position, arr) => {
    if (position < 0 || position >= size) {
      return true;
    } else if (arr[position] === 0) {
      arr[position] = 1;
      return true;
    }
    return false;
  };

  let initials = input
    .shift()
    .split(" ")
    .map(Number);
  for (const index of initials) {
    if (isValidIndex(index, field)) {
      field[index] = 1;
    }
  }

  for (const line of input) {
    let data = line.split(" ");
    let start = Number(data[0]);
    let direction = data[1];
    let change =
      direction.toLowerCase() === "right"
        ? Number(data[2])
        : Number(data[2]) * -1;
    let position = start + change;
    if (field[start] === 1) {
      field[start] = 0;
      while (!success(position, field)) {
        position += change;
      }
    }
  }

  console.log(field.join(" "));
}