feat(2023-02): checksum a set of games

produces a checksum of a set of games by
tallying the IDs of games that are valid

Author: developher-net

2023/day-02/game.js

@@ -46,7 +46,15 @@ const validateGame = (game, limit) => {
   return (tally.r <= lim.r && tally.g <= lim.g && tally.b <= lim.b)
 }
 
+const checksumGameSet = (games, limit) => {
+  // tally the IDs of valid games
+  return games.reduce((acc, game) => {
+    return validateGame(game, limit) ? acc + game.id : acc
+  }, 0)
+}
+
 module.exports = {
   parseGame,
-  validateGame
+  validateGame,
+  checksumGameSet
 }

2023/day-02/game.test.js

@@ -1,6 +1,6 @@
 /* eslint-env mocha */
 const { expect } = require('chai')
-const { parseGame, validateGame } = require('./game')
+const { parseGame, validateGame, checksumGameSet } = require('./game')
 
 describe('--- Day 2: Cube Conundrum ---', () => {
   describe('Part 1', () => {
@@ -58,7 +58,7 @@ describe('--- Day 2: Cube Conundrum ---', () => {
     })
 
     describe('validateGame', () => {
-      it.only('checks if the game is valid given the limits', () => {
+      it('checks if the game is valid given the limits', () => {
         const limits = '0c0d0e' // 12 red cubes, 13 green cubes, and 14 blue cubes
         const data = [
           {
@@ -103,5 +103,50 @@ describe('--- Day 2: Cube Conundrum ---', () => {
         })
       })
     })
+
+    describe('checksumGameSet', () => {
+      it('tallies the IDs of valid games', () => {
+        const limits = '0c0d0e' // 12 red cubes, 13 green cubes, and 14 blue cubes
+        const data = [
+          {
+            id: 1,
+            draws: [
+              '040003',
+              '010206',
+              '000200'
+            ]
+          }, {
+            id: 2,
+            draws: [
+              '000201',
+              '010304',
+              '000101'
+            ]
+          }, {
+            id: 3,
+            draws: [
+              '140806',
+              '040d05',
+              '010500'
+            ]
+          }, {
+            id: 4,
+            draws: [
+              '030106',
+              '060300',
+              '0e030f'
+            ]
+          }, {
+            id: 5,
+            draws: [
+              '060301',
+              '010202'
+            ]
+          }
+        ]
+
+        expect(checksumGameSet(data, limits)).to.equal(8)
+      })
+    })
   })
 })