moving to let instead of const

src/2015/day01.spec.js

@@ -1,7 +1,7 @@
 import { part1, part2 } from './day01.js';
 import readInput from '../utils/read-input.js';
 
-const input = readInput(import.meta.url);
+let input = readInput(import.meta.url);
 
 describe('day01 2015', () => {
  describe('part1', () => {

src/2015/day02.spec.js

@@ -1,7 +1,7 @@
 import { part1, part2 } from './day02.js';
 import readInput from '../utils/read-input.js';
 
-const input = readInput(import.meta.url);
+let input = readInput(import.meta.url);
 
 describe('day02 2015', () => {
  describe('part1', () => {

src/2015/day03.spec.js

@@ -1,7 +1,7 @@
 import { part1, part2 } from './day03.js';
 import readInput from '../utils/read-input.js';
 
-const input = readInput(import.meta.url);
+let input = readInput(import.meta.url);
 
 describe('day03 2015', () => {
  describe('part1', () => {

src/2015/day04.spec.js

@@ -1,7 +1,7 @@
 import { part1, part2 } from './day04.js';
 import readInput from '../utils/read-input.js';
 
-const input = readInput(import.meta.url);
+let input = readInput(import.meta.url);
 
 describe('day04 2015', () => {
  describe('part1', () => {

src/2015/day05.spec.js

@@ -1,7 +1,7 @@
 import { part1, part2 } from './day05.js';
 import readInput from '../utils/read-input.js';
 
-const input = readInput(import.meta.url);
+let input = readInput(import.meta.url);
 
 describe('day05 2015', () => {
  describe('part1', () => {

src/2015/day06.spec.js

@@ -1,7 +1,7 @@
 import { part1, part2 } from './day06.js';
 import readInput from '../utils/read-input.js';
 
-const input = readInput(import.meta.url);
+let input = readInput(import.meta.url);
 
 describe('day06 2015', () => {
  describe('part1', () => {

src/2015/day07.spec.js

@@ -1,7 +1,7 @@
 import { part1, part2 } from './day07.js';
 import readInput from '../utils/read-input.js';
 
-const input = readInput(import.meta.url);
+let input = readInput(import.meta.url);
 
 describe('day07 2015', () => {
  describe('part1', () => {

src/2015/day08.spec.js

@@ -1,7 +1,7 @@
 import { part1, part2 } from './day08.js';
 import readInput from '../utils/read-input.js';
 
-const input = readInput(import.meta.url);
+let input = readInput(import.meta.url);
 
 describe('day08 2015', () => {
  describe('part1', () => {

src/2015/day09.spec.js

@@ -1,7 +1,7 @@
 import { part1, part2 } from './day09.js';
 import readInput from '../utils/read-input.js';
 
-const input = readInput(import.meta.url);
+let input = readInput(import.meta.url);
 
 describe('day09 2015', () => {
  describe('part1', () => {

src/2015/day10.spec.js

@@ -1,7 +1,7 @@
 import { part1, part2 } from './day10.js';
 import readInput from '../utils/read-input.js';
 
-const input = readInput(import.meta.url);
+let input = readInput(import.meta.url);
 
 describe('day10 2015', () => {
  describe('part1', () => {

src/2015/day11.spec.js

@@ -1,7 +1,7 @@
 import { part1, part2 } from './day11.js';
 import readInput from '../utils/read-input.js';
 
-const input = readInput(import.meta.url);
+let input = readInput(import.meta.url);
 
 describe('day11 2015', () => {
  describe('part1', () => {

src/2015/day12.spec.js

@@ -1,7 +1,7 @@
 import { part1, part2 } from './day12.js';
 import readInput from '../utils/read-input.js';
 
-const input = readInput(import.meta.url);
+let input = readInput(import.meta.url);
 
 describe('day12 2015', () => {
  describe('part1', () => {

src/2015/day13.spec.js

@@ -1,7 +1,7 @@
 import { part1, part2 } from './day13.js';
 import readInput from '../utils/read-input.js';
 
-const input = readInput(import.meta.url);
+let input = readInput(import.meta.url);
 
 describe('day13 2015', () => {
  describe('part1', () => {

src/2015/day14.spec.js

@@ -1,7 +1,7 @@
 import { part1, part2 } from './day14.js';
 import readInput from '../utils/read-input.js';
 
-const input = readInput(import.meta.url);
+let input = readInput(import.meta.url);
 
 describe('day14 2015', () => {
  describe('part1', () => {

src/2015/day15.spec.js

@@ -1,7 +1,7 @@
 import { day } from './day15.js';
 import readInput from '../utils/read-input.js';
 
-const input = readInput(import.meta.url);
+let input = readInput(import.meta.url);
 
 describe('day15 2015', () => {
  test('it should work for example', () => {

src/2015/day16.spec.js

@@ -1,7 +1,7 @@
 import { part1, part2 } from './day16.js';
 import readInput from '../utils/read-input.js';
 
-const input = readInput(import.meta.url);
+let input = readInput(import.meta.url);
 
 describe('day16 2015', () => {
  describe('part1', () => {

src/2015/day17.spec.js

@@ -1,7 +1,7 @@
 import { day } from './day17.js';
 import readInput from '../utils/read-input.js';
 
-const input = readInput(import.meta.url);
+let input = readInput(import.meta.url);
 
 describe('day17 2015', () => {
  test('it should work for example', () => {

src/2015/day18.spec.js

@@ -1,7 +1,7 @@
 import { part1, part2 } from './day18.js';
 import readInput from '../utils/read-input.js';
 
-const input = readInput(import.meta.url);
+let input = readInput(import.meta.url);
 
 describe('day18 2015', () => {
  describe('part1', () => {

src/2015/day19.spec.js

@@ -1,7 +1,7 @@
 import { part1, part2 } from './day19.js';
 import readInput from '../utils/read-input.js';
 
-const input = readInput(import.meta.url);
+let input = readInput(import.meta.url);
 
 describe('day19 2015', () => {
  describe('part1', () => {

src/2015/day20.spec.js

@@ -1,7 +1,7 @@
 import { day } from './day20.js';
 import readInput from '../utils/read-input.js';
 
-const input = readInput(import.meta.url);
+let input = readInput(import.meta.url);
 
 describe('day20 2015', () => {
  describe('part1', () => {

src/2015/day21.js

@@ -1,5 +1,5 @@
 function calcOptions() {
- const items = {
+ let items = {
  weapons: [
  { name: 'dagger', cost: 8, damage: 4, armor: 0 },
  { name: 'shortsword', cost: 10, damage: 5, armor: 0 },

src/2015/day21.spec.js

@@ -1,7 +1,7 @@
 import { part1, part2 } from './day21.js';
 import readInput from '../utils/read-input.js';
 
-const input = readInput(import.meta.url);
+let input = readInput(import.meta.url);
 
 describe('day21 2015', () => {
  describe('part1', () => {

src/2015/day22.spec.js

@@ -1,7 +1,7 @@
 import { part1, part2 } from './day22.js';
 import readInput from '../utils/read-input.js';
 
-const input = readInput(import.meta.url);
+let input = readInput(import.meta.url);
 
 describe('day22 2015', () => {
  describe('part1', () => {

src/2015/day23.spec.js

@@ -1,7 +1,7 @@
 import { part1, part2 } from './day23.js';
 import readInput from '../utils/read-input.js';
 
-const input = readInput(import.meta.url);
+let input = readInput(import.meta.url);
 
 describe('day23 2015', () => {
  describe('part1', () => {

src/2015/day24.spec.js

@@ -1,7 +1,7 @@
 import { part1, part2 } from './day24.js';
 import readInput from '../utils/read-input.js';
 
-const input = readInput(import.meta.url);
+let input = readInput(import.meta.url);
 
 describe('day24 2015', () => {
  describe('part1', () => {

src/2015/day25.spec.js

@@ -1,7 +1,7 @@
 import { part1, part2 } from './day25.js';
 import readInput from '../utils/read-input.js';
 
-const input = readInput(import.meta.url);
+let input = readInput(import.meta.url);
 
 describe('day25 2015', () => {
  describe('part1', () => {

src/2016/day01.js

@@ -4,20 +4,21 @@ const directions = [
  { y: -1, x: 0 },
  { y: 0, x: -1 },
 ];
+
 export function day(input) {
- const destination = input
+ let destination = input
  .split(', ')
  .map(x => {
- const [, turn, count] = x.match(/^(R|L)(\d+)$/);
+ let [, turn, count] = x.match(/^(R|L)(\d+)$/);
  return { turn: turn === 'R' ? 1 : -1, count: +count };
  })
  .reduce(
  (state, next) => {
- const direction =
+ let direction =
  (state.direction + next.turn + directions.length) % directions.length;
  return new Array(next.count).fill().reduce(state => {
- const x = state.x + directions[direction].x;
- const y = state.y + directions[direction].y;
+ let x = state.x + directions[direction].x;
+ let y = state.y + directions[direction].y;
  if (state.history[`${x},${y}`]) {
  state.twice = state.twice || { x, y };
  } else {

src/2016/day01.spec.js

@@ -1,7 +1,7 @@
 import { day } from './day01.js';
 import readInput from '../utils/read-input.js';
 
-const input = readInput(import.meta.url);
+let input = readInput(import.meta.url);
 
 describe('day01 2016', () => {
  describe('part1', () => {

src/2016/day02.js

@@ -6,7 +6,7 @@ const directions = {
 };
 
 function move(keypad, position, step) {
- const next = { x: position.x + step.x, y: position.y + step.y };
+ let next = { x: position.x + step.x, y: position.y + step.y };
  return keypad[next.y] && keypad[next.y][next.x] ? next : position;
 }
 
@@ -28,22 +28,24 @@ function solve(input, keypad, start) {
  .join('');
 }
 
+const keypad1 = [
+ ['1', '2', '3'],
+ ['4', '5', '6'],
+ ['7', '8', '9'],
+];
+
 export function part1(input) {
- const keypad1 = [
- ['1', '2', '3'],
- ['4', '5', '6'],
- ['7', '8', '9'],
- ];
  return solve(input, keypad1, { x: 1, y: 1 });
 }
 
+const keypad2 = [
+ [NaN, NaN, '1', NaN, NaN],
+ [NaN, '2', '3', '4', NaN],
+ ['5', '6', '7', '8', '9'],
+ [NaN, 'A', 'B', 'C', NaN],
+ [NaN, NaN, 'D', NaN, NaN],
+];
+
 export function part2(input) {
- const keypad2 = [
- [NaN, NaN, '1', NaN, NaN],
- [NaN, '2', '3', '4', NaN],
- ['5', '6', '7', '8', '9'],
- [NaN, 'A', 'B', 'C', NaN],
- [NaN, NaN, 'D', NaN, NaN],
- ];
  return solve(input, keypad2, { x: 0, y: 2 });
 }

src/2016/day02.spec.js

@@ -1,7 +1,7 @@
 import { part1, part2 } from './day02.js';
 import readInput from '../utils/read-input.js';
 
-const input = readInput(import.meta.url);
+let input = readInput(import.meta.url);
 
 describe('day02 2016', () => {
  describe('part1', () => {

src/2016/day03.spec.js

@@ -1,7 +1,7 @@
 import { part1, part2 } from './day03.js';
 import readInput from '../utils/read-input.js';
 
-const input = readInput(import.meta.url);
+let input = readInput(import.meta.url);
 
 describe('day03 2016', () => {
  describe('part1', () => {

src/2016/day04.js

@@ -1,10 +1,10 @@
 function parseRoom(s) {
- const [, name, sector, checksum] = s.match(/^(.*)-(\d+)\[(.*)\]$/);
+ let [, name, sector, checksum] = s.match(/^(.*)-(\d+)\[(.*)\]$/);
  return { name, sector: +sector, checksum };
 }
 
 function checksum(s) {
- const occurrences = s
+ let occurrences = s
  .replace(/-/g, '')
  .split('')
  .sort()
@@ -48,13 +48,13 @@ function parse(input) {
 }
 
 export function part1(input) {
- const rooms = parse(input);
+ let rooms = parse(input);
  return rooms.reduce((sum, room) => sum + room.sector, 0);
 }
 
 export function part2(input) {
- const rooms = parse(input);
- const room = rooms
+ let rooms = parse(input);
+ let room = rooms
  .map(room => decrypt(room.name, room.sector))
  .findIndex(x => x === 'northpole object storage');
  return rooms[room] && rooms[room].sector;

src/2016/day04.spec.js

@@ -1,7 +1,7 @@
 import { part1, part2 } from './day04.js';
 import readInput from '../utils/read-input.js';
 
-const input = readInput(import.meta.url);
+let input = readInput(import.meta.url);
 
 describe('day04 2016', () => {
  describe('part1', () => {

src/2016/day05.js

@@ -4,15 +4,15 @@ export function day(input) {
  let hash,
  count = 0;
  let password1 = '';
- const password2 = [];
+ let password2 = [];
  let index = -1;
  while (count < 8) {
  do {
  index++;
  hash = md5(input + index);
  } while (!hash.startsWith('00000'));
 
- const i = +hash[5];
+ let i = +hash[5];
  password1 += hash[5];
  if (i >= 0 && i <= 7 && !password2[i]) {
  password2[i] = hash[6];