Advent of Code: Day 1

main.dart

import 'dart:io';

int fuelMassForModule(int moduleMass, [int massSoFar = 0]) {
  var mass = (moduleMass / 3).floor() - 2;

  if (mass <= 0) {
    return 0;
  } else {
    return mass + fuelMassForModule(mass, massSoFar);
  }
}

void main() async {
  final input = File('day1_input.txt');
  final lines = await input.readAsLines();

  var totalMass = 0;

  for (var line in lines) {
    var moduleMass = int.parse(line);

    totalMass += fuelMassForModule(moduleMass);
  }

  print('Total mass is: $totalMass');
}