station2.js

module.exports = (input, stationCoordinates = { x: 0, y: 0}) => {
  const { x: x1, y: y1 } = stationCoordinates;

  let targets = input
    .split('\n')
    .reduce((objects, line, y2) => {
      line.trim().split('').forEach((space, x2) => {
        if (space === '#' && !(x1 === x2 && y1 === y2)) {
          objects.push({
            x: x2,
            y: y2,
            degrees: Math.atan2(y2 - y1, x2 - x1) * (180 / Math.PI),
            distance: Math.hypot(x1 - x2, y1 - y2),
          });
        }
      });

      return objects;
    }, [])
    .sort((a, b) => a.degrees - b.degrees);

  const targetDegrees = [...new Set(targets.map(({ degrees }) => degrees))];

  let currentDegrees = targetDegrees.findIndex((degrees) => degrees === -90);
  let counter = 0;

  while (targets.length) {
    const target = targets
      .filter(({ degrees }) => degrees === targetDegrees[currentDegrees])
      .sort((a, b) => a.distance - b.distance)[0];

    if (target) {
      targets = targets.filter(({ x, y }) => !(x === target.x && y === target.y));

      if (++counter === 200) {
        return target.x * 100 + target.y;
      }
    }

    currentDegrees = currentDegrees < targetDegrees.length ? currentDegrees + 1 : 0;
  }
};