day01.js

const moduleMasses = [
  54032,
  64433,
  71758,
  133884,
  76994,
  99596,
  90491,
  89188,
  142280,
  127352,
  62127,
  79849,
  96049,
  56527,
  148029,
  81386,
  149827,
  105377,
  91970,
  98708,
  88611,
  99785,
  99229,
  88460,
  80396,
  70097,
  91784,
  81733,
  75671,
  106787,
  77196,
  132234,
  98698,
  115243,
  119574,
  142851,
  58964,
  137814,
  127695,
  92139,
  106277,
  51240,
  121351,
  78316,
  129472,
  65201,
  116068,
  72803,
  52582,
  135433,
  87619,
  68096,
  116952,
  106437,
  70517,
  69840,
  89863,
  134618,
  83823,
  113436,
  103779,
  134819,
  107928,
  138503,
  82509,
  90104,
  98001,
  76202,
  136238,
  66426,
  74030,
  55075,
  124163,
  57133,
  79908,
  109977,
  66903,
  125400,
  130961,
  149293,
  99203,
  120307,
  142403,
  50262,
  52854,
  70851,
  142213,
  77567,
  149144,
  144582,
  58138,
  61765,
  116209,
  128192,
  137436,
  101406,
  69037,
  107389,
  112389,
  124402
];

const totalFuelRequirement = moduleMasses.reduce(
  (acc, mass) => acc + getFuelRequirement(mass),
  0
);

function getFuelRequirement(mass) {
  const fuelRequirement = Math.floor(mass / 3) - 2;
  if (fuelRequirement <= 0) return 0;
  const fuelsAdditionalRequirement = getFuelRequirement(fuelRequirement);
  return fuelRequirement + fuelsAdditionalRequirement;
}