jsadvent/solutions/2017/1.js

const { Glib } = require('../../lib');

const VALUE = {
  '(': 1,
  ')': -1,
};

module.exports = {
  '1': (input) =>
    Glib.fromIterable(input)
      .filter((char, index) => char === input[(index + 1n) % input.lengthN])
      .toInts()
      .sum(),
  '2': (input) =>
    Glib.fromIterable(input)
      .filter(
        (char, index) =>
          char === input[(index + input.lengthN / 2n) % input.lengthN],
      )
      .toInts()
      .sum(),
};