advent-of-code/puzzles/1/index.js

const fs = require('fs/promises');


const main = async (filePath) => {

  const input = await fs.readFile(filePath, 'utf8');


  console.log("Input: ", input.slice(0,100));
  const elfTotals = input.split('\n\n').map(elfStr => sumArray(elfStr.split('\n')));

  console.log("elfTotals: ", elfTotals.slice(0, 5));

  elfTotals.sort((a,b) => b-a);

  console.log("Sorted elfTotals: ", elfTotals.slice(0, 5));


  return sumArray(elfTotals.slice(0,3));
}

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

main("./input.txt").then(result => {
  console.log("Done!");

  console.log("Result: ", result);
});