Initial commit

.gitignore

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+# Based on https://raw.githubusercontent.com/github/gitignore/main/Node.gitignore
+
+# Logs
+
+logs
+_.log
+npm-debug.log_
+yarn-debug.log*
+yarn-error.log*
+lerna-debug.log*
+.pnpm-debug.log*
+
+# Caches
+
+.cache
+
+# Diagnostic reports (https://nodejs.org/api/report.html)
+
+report.[0-9]_.[0-9]_.[0-9]_.[0-9]_.json
+
+# Runtime data
+
+pids
+_.pid
+_.seed
+*.pid.lock
+
+# Directory for instrumented libs generated by jscoverage/JSCover
+
+lib-cov
+
+# Coverage directory used by tools like istanbul
+
+coverage
+*.lcov
+
+# nyc test coverage
+
+.nyc_output
+
+# Grunt intermediate storage (https://gruntjs.com/creating-plugins#storing-task-files)
+
+.grunt
+
+# Bower dependency directory (https://bower.io/)
+
+bower_components
+
+# node-waf configuration
+
+.lock-wscript
+
+# Compiled binary addons (https://nodejs.org/api/addons.html)
+
+build/Release
+
+# Dependency directories
+
+node_modules/
+jspm_packages/
+
+# Snowpack dependency directory (https://snowpack.dev/)
+
+web_modules/
+
+# TypeScript cache
+
+*.tsbuildinfo
+
+# Optional npm cache directory
+
+.npm
+
+# Optional eslint cache
+
+.eslintcache
+
+# Optional stylelint cache
+
+.stylelintcache
+
+# Microbundle cache
+
+.rpt2_cache/
+.rts2_cache_cjs/
+.rts2_cache_es/
+.rts2_cache_umd/
+
+# Optional REPL history
+
+.node_repl_history
+
+# Output of 'npm pack'
+
+*.tgz
+
+# Yarn Integrity file
+
+.yarn-integrity
+
+# dotenv environment variable files
+
+.env
+.env.development.local
+.env.test.local
+.env.production.local
+.env.local
+
+# parcel-bundler cache (https://parceljs.org/)
+
+.parcel-cache
+
+# Next.js build output
+
+.next
+out
+
+# Nuxt.js build / generate output
+
+.nuxt
+dist
+
+# Gatsby files
+
+# Comment in the public line in if your project uses Gatsby and not Next.js
+
+# https://nextjs.org/blog/next-9-1#public-directory-support
+
+# public
+
+# vuepress build output
+
+.vuepress/dist
+
+# vuepress v2.x temp and cache directory
+
+.temp
+
+# Docusaurus cache and generated files
+
+.docusaurus
+
+# Serverless directories
+
+.serverless/
+
+# FuseBox cache
+
+.fusebox/
+
+# DynamoDB Local files
+
+.dynamodb/
+
+# TernJS port file
+
+.tern-port
+
+# Stores VSCode versions used for testing VSCode extensions
+
+.vscode-test
+
+# yarn v2
+
+.yarn/cache
+.yarn/unplugged
+.yarn/build-state.yml
+.yarn/install-state.gz
+.pnp.*
+
+# IntelliJ based IDEs
+.idea
+
+# Finder (MacOS) folder config
+.DS_Store

README.md

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+# aoc-2024
+
+To install dependencies:
+
+```bash
+bun install
+```
+
+To run:
+
+```bash
+bun run index.ts
+```
+
+This project was created using `bun init` in bun v1.1.36. [Bun](https://bun.sh) is a fast all-in-one JavaScript runtime.

day-1/day1-part1.ts

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+import * as path from 'path'
+
+export async function day1Part1() {
+    const input = await Bun.file(path.join(__dirname,'input.txt')).text()
+    const lines = input.split('\n')
+    const column1: number[] = []
+    const column2: number[] = []
+
+    for (const line of lines) {
+        const [left, right] = line.split('   ')
+        column1.push(Number.parseInt(left, 10))
+        column2.push(Number.parseInt(right, 10))
+    }
+
+    column1.sort().reverse()
+    column2.sort().reverse()
+
+    let result = 0
+
+    for(let i=0; i< column1.length; i++){
+        const left = column1[i]
+        const right = column2[i]
+        const diff = Math.abs(left - right)
+        result += diff
+    }
+
+    console.log({result})
+}

day-1/day1-part2.ts

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+import * as path from 'path'
+
+export async function day1Part2() {
+    const start = performance.now()
+    const input = await Bun.file(path.join(__dirname, 'input.txt')).text()
+    const lines = input.split('\n')
+    const column1: number[] = []
+    const column2Map = new Map()
+
+    for (const line of lines) {
+        const [left, right] = line.split('   ')
+        const n1 = Number.parseInt(left, 10)
+        const n2 = Number.parseInt(right, 10)
+        column1.push(n1)
+
+        if (column2Map.has(n2)) {
+            const v = column2Map.get(n2)
+            column2Map.set(n2, v + 1)
+        } else {
+            column2Map.set(n2, 1)
+        }
+    }
+
+    let result = 0
+    for (let i = 0; i < column1.length; i++) {
+        const left = column1[i]
+        if(!column2Map.has(left)){
+            continue
+        }
+        const multiplier = column2Map.get(left)
+
+        result += multiplier * left
+    }
+
+    const end = performance.now()
+
+    console.log({result, time: end - start})
+}

index.ts

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+import {day1Part1} from "./day-1/day1-part1.ts";
+import {day1Part2} from "./day-1/day1-part2.ts";
+
+await day1Part2()

package.json

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+{
+  "name": "aoc-2024",
+  "module": "index.ts",
+  "type": "module",
+  "devDependencies": {
+    "@types/bun": "latest"
+  },
+  "peerDependencies": {
+    "typescript": "^5.0.0"
+  },
+  "dependencies": {
+    "remeda": "^2.17.4"
+  }
+}

tsconfig.json

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+{
+  "compilerOptions": {
+    // Enable latest features
+    "lib": ["ESNext", "DOM"],
+    "target": "ESNext",
+    "module": "ESNext",
+    "moduleDetection": "force",
+    "jsx": "react-jsx",
+    "allowJs": true,
+
+    // Bundler mode
+    "moduleResolution": "bundler",
+    "allowImportingTsExtensions": true,
+    "verbatimModuleSyntax": true,
+    "noEmit": true,
+
+    // Best practices
+    "strict": true,
+    "skipLibCheck": true,
+    "noFallthroughCasesInSwitch": true,
+
+    // Some stricter flags (disabled by default)
+    "noUnusedLocals": false,
+    "noUnusedParameters": false,
+    "noPropertyAccessFromIndexSignature": false
+  }
+}