real shloppy advent of code day 1

advent2021_day_1.js

const data = require('./data.json');

const sumArray = (array) => array.reduce((a, b) => a + b, 0);

const results = data.data.reduce((acc, n, idx, arr) => {
  const lenIn = arr.length;
  const isPastTupleTime = lenIn - idx <= 2;
  const newAcc = {
    ...acc,
    lastValue: n,
  };
  
  if (idx === 0) {
    const newTuple = arr.slice(idx, idx + 3);
    newAcc.lastWindow = newTuple;
    newAcc.lastWindowSum = sumArray(newTuple);

    return newAcc;
  };

  if (n > acc.lastValue) {
    newAcc.rateIncreases += 1;
  }

  if (!isPastTupleTime) {
    const newTuple = arr.slice(idx, idx + 3);
    newAcc.lastWindow = newTuple;
    newAcc.lastWindowSum = sumArray(newTuple);

    if (newAcc.lastWindowSum > acc.lastWindowSum) {
      newAcc.windowIncreases += 1;
    }
  }

  return newAcc;
}, {
  lastValue: 0,
  rateIncreases: 0,
  windowIncreases: 0,
  lastWindow: [0, 0, 0],
  lastWindowSum: 0,
});

console.log(results.rateIncreases);
console.log(results.windowIncreases);