​

function preload() {

  rawinput01 = loadStrings('input.txt')

}

​

function setup() {

  noCanvas()

  input01 = rawinput01.map(string => Number(string))

  part1()

  part2()

}

​

function fuelRequired(mass) {

  return floor(mass / 3) - 2

}

​

function fuelRequiredRecursive(mass, total=0) {

  if (fuelRequired(mass) <= 0) {

    return total

  }

  let fuel = fuelRequired(mass)

  return total + fuel + fuelRequiredRecursive(fuel)

}

​

function part1() {

  let fuels = input01.map(mass => fuelRequired(mass))

  let fuelSum = fuels.reduce((accumulator, summand) => accumulator + summand)

  print(`part 1 total fuel output: ${fuelSum}`) 

}

​

function part2() {

  let fuels = input01.map(mass => fuelRequiredRecursive(mass))

  let fuelSum = fuels.reduce((accumulator, summand) => accumulator + summand)

  print(`part 2 total fuel output: ${fuelSum}`) 

}

​

​

function testPart1() {

  let testMasses = [12, 14, 1969, 100756]

  let testSolutions = [2, 2, 654, 33583]

  for (let i = 0; i < testMasses.length; i++) {

     let mass = testMasses[i]

     let solution = testSolutions[i]

     let result = fuelRequired(mass)

     print(mass, solution, result)

  }

}

​

function testPart2() {

  let testMasses = [14, 1969, 100756]

  let testSolutions = [2, 966, 50346]

  for (let i = 0; i < testMasses.length; i++) {

     let mass = testMasses[i]

     let solution = testSolutions[i]

     let result = fuelRequiredRecursive(mass)

     print(mass, solution, result)

  }

}

​