Discussion on: Advent of Code 2019 Solution Megathread - Day 1: The Tyranny of the Rocket Equation

defmodule Day01 do
  def mass_calc([]), do: 0
  def mass_calc([ head | tail]), do: fuel(head) + mass_calc(tail)
  def fuel(mass), do: floor(mass / 3) - 2
end

Day01.mass_calc([146561, 98430, 131957, 81605, 70644, 55060, 93217, 107158, 110769, 94650, 141070, 72381, 100736, 105705, 99003, 94057, 110662, 74429, 55509, 63492, 102007, 72627, 95183, 112072, 122313, 116884, 125451, 106093, 140678, 121751, 149018, 58459, 138306, 149688, 82927, 72676, 95010, 88439, 51807, 103175, 107633, 126439, 128879, 112054, 52873, 114493, 77365, 76768, 60838, 89692, 66217, 96060, 100338, 139063, 126869, 106490, 128967, 116312, 56822, 52422, 124579, 117120, 106245, 105255, 66975, 115340, 145764, 
149427, 64228, 64237, 67887, 103345, 134901, 50226, 126991, 122314, 140818, 129687, 149792, 101148, 73411, 87078, 121272, 108804, 96063, 81155, 62058, 112684, 134263, 128454, 99455, 91689, 141448, 143892, 103257, 64352, 90769, 78307, 111855, 130153])