Discussion on: AoC Day 1: Chronal Calibration

def parse(input) do
  input
  |> String.split("\n")
  |> Enum.map(&(String.trim(&1)
    |> String.to_integer())
  )
end

function parse() {
  return input()
    .split('\n')
    .map(Number);
}

def part_1 do
  input() 
  |> parse() 
  |> Enum.sum()
end

function partOne() {
  return parse()
    .reduce((total, current) => total + current, 0);
}

def part_2 do
 input() 
 |> parse() 
 |> part_2(0, %{})
end

def part_2([current | rest] = _frequencies, total, record) do
  total = current + total
  record = Map.update(record, total, 1, &(&1 + 1))

  case record[total] do
    n when n > 1 ->
      total

    _ ->
      part_2(rest, total, record)
  end
end

def part_2([], total, record) do
  input()
  |> parse()
  |> part_2(total, record)
end

function partTwoImperative() {
  let record = {};
  let frequency = 0;
  let index = 0;
  let frequencyList = parse();
  let totalLoops = 0;

  const found = (record, frequency) => 
    (record[frequency] || 0) > 1;
  const getFrequencyRecordValue = (record, frequency) =>
    (record[frequency] || 0) + 1;

  while (!found(record, frequency)) {
    if (index === frequencyList.length) index = 0;

    frequency += frequencyList[index];
    record[frequency] = getFrequencyRecordValue(record, frequency);
    index += 1;
    totalLoops += 1;
  }

  return [frequency, totalLoops];
}

function partTwoTrampoline() {
  const found = (record, frequency) => (record[frequency] || 0) > 1;

  const getFrequencyRecordValue = (record, frequency) =>
    (record[frequency] || 0) + 1;

  const partTwoRecursive = ([current, ...rest], total, record) => {
    const newTotal = total + current;

    const newRecord = {
      ...record,
      [newTotal]: getFrequencyRecordValue(record, newTotal)
    };

    return !found(newRecord, newTotal)
      ? () =>
          partTwoRecursive(
            rest.length ? rest : [3, 3, 4, -2, -4],
            newTotal,
            newRecord
          )
      : newTotal;
  };

  let ret = partTwoRecursive([3, 3, 4, -2, -4], 0, {});

  while (typeof ret === 'function') {
    ret = ret();
  }

  return ret;
}