feat(2022): add day 2 in javascript

Author: believer

javascript/2022/day01.mjs

@@ -1,16 +1,20 @@
-import { sum, readInput, sortDESC } from './utils.mjs'
+import {
+  sum,
+  readInput,
+  sortDESC,
+  splitLines,
+  removeEmpty,
+  map,
+  reduce,
+  add,
+  pipe,
+} from './utils.mjs'
 
 const input = await readInput('01')
 
 const parsedInput = input
   .split('\n\n')
-  .flatMap(group =>
-    group
-      .split('\n')
-      .filter(l => l)
-      .map(Number)
-      .reduce(sum, 0)
-  )
+  .flatMap(pipe(splitLines, removeEmpty, map(Number), reduce(add, 0)))
   .slice()
   .sort(sortDESC)
 

javascript/2022/day02.mjs

@@ -0,0 +1,74 @@
+import {
+  readInput,
+  sum,
+  splitWhitespace,
+  splitLines,
+  removeEmpty,
+  pipe,
+  map,
+  add,
+  reduce,
+} from './utils.mjs'
+
+const input = await readInput('02')
+const parsedInput = pipe(splitLines, removeEmpty, map(splitWhitespace))(input)
+
+const scores = {
+  win: 6,
+  loss: 0,
+  draw: 3,
+  rock: 1,
+  paper: 2,
+  scissors: 3,
+}
+
+const player1 = {
+  A: 'rock',
+  B: 'paper',
+  C: 'scissors',
+}
+
+const player2 = {
+  X: 'rock',
+  Y: 'paper',
+  Z: 'scissors',
+}
+
+const outcome = {
+  X: 'loss',
+  Y: 'draw',
+  Z: 'win',
+}
+
+const part1 = pipe(
+  map(([p1, p2]) => [player1[p1], player2[p2]]),
+  map(([p1, p2]) => {
+    if (p1 === p2) return scores.draw + scores[p2]
+    if (p1 === 'rock' && p2 === 'paper') return scores.win + scores.paper
+    if (p1 === 'rock' && p2 === 'scissors') return scores.loss + scores.scissors
+    if (p1 === 'paper' && p2 === 'rock') return scores.loss + scores.rock
+    if (p1 === 'paper' && p2 === 'scissors') return scores.win + scores.scissors
+    if (p1 === 'scissors' && p2 === 'rock') return scores.win + scores.rock
+    if (p1 === 'scissors' && p2 === 'paper') return scores.loss + scores.paper
+  }),
+  reduce(add, 0)
+)(parsedInput)
+
+const part2 = pipe(
+  map(([p1, p2]) => [player1[p1], outcome[p2]]),
+  map(([p1, p2]) => {
+    if (p1 === 'rock' && p2 === 'loss') return scores.loss + scores.scissors
+    if (p1 === 'rock' && p2 === 'draw') return scores.draw + scores.rock
+    if (p1 === 'rock' && p2 === 'win') return scores.win + scores.paper
+    if (p1 === 'paper' && p2 === 'loss') return scores.loss + scores.rock
+    if (p1 === 'paper' && p2 === 'draw') return scores.draw + scores.paper
+    if (p1 === 'paper' && p2 === 'win') return scores.win + scores.scissors
+    if (p1 === 'scissors' && p2 === 'loss') return scores.loss + scores.paper
+    if (p1 === 'scissors' && p2 === 'draw') return scores.draw + scores.scissors
+    if (p1 === 'scissors' && p2 === 'win') return scores.win + scores.rock
+  }),
+  reduce(add, 0)
+)(parsedInput)
+
+console.log('Part 1:', part1)
+console.log('Part 2:', part2)