Advent of code 2017 — Day 2

Advent of code 2017 — Day 2.js

// http://adventofcode.com/2017/day/2

// Parse the input into a two-dimensional array of numbers
const parseSpreadsheetRow = input => input.split(/\s+/).map(n => parseInt(n));
const parseSpreadsheet = input => input.split('\n').map(parseSpreadsheetRow);

// Find the highest and lowest values in a list
const max = values =>
  values.reduce((previous, current) => Math.max(previous, current));
const min = values =>
  values.reduce((previous, current) => Math.min(previous, current));

// Calculate the checksum of a line
const rowChecksum = values => max(values) - min(values);

// Parse the spreadsheet and calculate the checksum
const checksum = input =>
  parseSpreadsheet(input)
    .map(rowChecksum)
    .reduce((acc, i) => acc + i);