2025: day6: JS

AdventOfCode2025/day6/.gitignore

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+# dependencies (bun install)
+node_modules
+
+# output
+out
+dist
+*.tgz
+
+# code coverage
+coverage
+*.lcov
+
+# logs
+logs
+_.log
+report.[0-9]_.[0-9]_.[0-9]_.[0-9]_.json
+
+# dotenv environment variable files
+.env
+.env.development.local
+.env.test.local
+.env.production.local
+.env.local
+
+# caches
+.eslintcache
+.cache
+*.tsbuildinfo
+
+# IntelliJ based IDEs
+.idea
+
+# Finder (MacOS) folder config
+.DS_Store

AdventOfCode2025/day6/README.md

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+# day6
+
+To install dependencies:
+
+```bash
+bun install
+```
+
+To run:
+
+```bash
+bun run index.ts
+```
+
+This project was created using `bun init` in bun v1.2.8. [Bun](https://bun.sh) is a fast all-in-one JavaScript runtime.

AdventOfCode2025/day6/bun.lock

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+{
+  "lockfileVersion": 1,
+  "workspaces": {
+    "": {
+      "name": "day6",
+      "devDependencies": {
+        "@types/bun": "latest",
+      },
+      "peerDependencies": {
+        "typescript": "^5",
+      },
+    },
+  },
+  "packages": {
+    "@types/bun": ["@types/bun@1.3.3", "", { "dependencies": { "bun-types": "1.3.3" } }, "sha512-ogrKbJ2X5N0kWLLFKeytG0eHDleBYtngtlbu9cyBKFtNL3cnpDZkNdQj8flVf6WTZUX5ulI9AY1oa7ljhSrp+g=="],
+
+    "@types/node": ["@types/node@24.10.1", "", { "dependencies": { "undici-types": "~7.16.0" } }, "sha512-GNWcUTRBgIRJD5zj+Tq0fKOJ5XZajIiBroOF0yvj2bSU1WvNdYS/dn9UxwsujGW4JX06dnHyjV2y9rRaybH0iQ=="],
+
+    "bun-types": ["bun-types@1.3.3", "", { "dependencies": { "@types/node": "*" } }, "sha512-z3Xwlg7j2l9JY27x5Qn3Wlyos8YAp0kKRlrePAOjgjMGS5IG6E7Jnlx736vH9UVI4wUICwwhC9anYL++XeOgTQ=="],
+
+    "typescript": ["typescript@5.9.3", "", { "bin": { "tsc": "bin/tsc", "tsserver": "bin/tsserver" } }, "sha512-jl1vZzPDinLr9eUt3J/t7V6FgNEw9QjvBPdysz9KfQDD41fQrC2Y4vKQdiaUpFT4bXlb1RHhLpp8wtm6M5TgSw=="],
+
+    "undici-types": ["undici-types@7.16.0", "", {}, "sha512-Zz+aZWSj8LE6zoxD+xrjh4VfkIG8Ya6LvYkZqtUQGJPZjYl53ypCaUwWqo7eI0x66KBGeRo+mlBEkMSeSZ38Nw=="],
+  }
+}

AdventOfCode2025/day6/index.ts

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+const file = Bun.file("./input.txt");
+const content = await file.text().then((c) => c.trim());
+
+const filterNonEmpty = (i: string) => i.length > 0
+
+type Problem = {
+    operation: string
+    numbers: number[]
+}
+
+const problems: Problem[] = [];
+
+const splitContent = content.split("\n")
+const operationsRow = splitContent.pop()!.split(" ").filter(filterNonEmpty)
+
+for (const line of splitContent) {
+    const numbers = line.split(" ").filter(filterNonEmpty);
+    if (problems.length === 0) {
+        for (let i = 0; i < numbers.length; i++) {
+            problems.push({
+                operation: '',
+                numbers: [],
+            })
+        }
+    }
+
+    for (let i = 0; i < numbers.length; i++) {
+        problems[i]!.numbers.push(parseInt(numbers[i]!))
+    }
+}
+
+for (const [index, problem] of problems.entries()) {
+    problem.operation = operationsRow[index]!
+}
+
+const getReducer = (op: string): (nums: number[]) => number => {
+    switch (op) {
+        case '*':
+            return (nums) => nums.reduce((n, acc) => acc * n, 1)
+        case '+':
+            return (nums) => nums.reduce((n, acc) => acc + n, 0)
+        default:
+            throw new Error("operation not supported")
+    }
+}
+
+const solve = (problems: Problem[]): number => {
+    let part1 = 0;
+
+    for (const problem of problems) {
+        const reducer = getReducer(problem.operation)
+        part1 += reducer(problem.numbers)
+    }
+
+    return part1
+}
+
+const transposeProblems = (str: string): Problem[] => {
+    const charArr = str.split("\n").map(c => c.split(""))
+
+    const newCharArr: string[][] = [];
+
+    for (let i = 0; i < charArr.length; i++) {
+        for (let j = 0; j < charArr[0]!.length; j++) {
+            if (!newCharArr[j]) {
+                newCharArr[j] = []
+            }
+            newCharArr[j]![i]! = charArr[i]![j]! ?? ' '
+        }
+    }
+
+    const problems: Problem[] = [];
+    let workingProblem: Problem = {
+        numbers: [],
+        operation: ""
+    }
+    let index = 0;
+
+    for (const line of newCharArr) {
+        if (line.every(c => c === " ")) {
+            problems.push(workingProblem)
+            workingProblem = {
+                numbers: [],
+                operation: ''
+            }
+            index = 0
+            continue
+        }
+
+        if (index === 0) {
+            const op = line.pop()
+            if (op !== " ") {
+                workingProblem.operation = op!
+            }
+        }
+
+        const numbers = line.filter(c => c !== " ")
+        if (numbers.length === 0) {
+            continue
+        }
+
+        const number = parseInt(numbers.join(""))
+        workingProblem.numbers.push(number)
+    }
+
+    problems.push(workingProblem)
+
+    return problems
+}
+
+const part1 = solve(problems)
+console.log("Part 1: ", part1)
+
+const part2Problems = transposeProblems(content)
+const part2 = solve(part2Problems)
+console.log("Part 2: ", part2)

AdventOfCode2025/day6/package.json

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+{
+  "name": "day6",
+  "module": "index.ts",
+  "type": "module",
+  "private": true,
+  "devDependencies": {
+    "@types/bun": "latest"
+  },
+  "peerDependencies": {
+    "typescript": "^5"
+  }
+}

AdventOfCode2025/day6/tsconfig.json

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+{
+  "compilerOptions": {
+    // Environment setup & latest features
+    "lib": ["ESNext"],
+    "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,
+    "noUncheckedIndexedAccess": true,
+
+    // Some stricter flags (disabled by default)
+    "noUnusedLocals": false,
+    "noUnusedParameters": false,
+    "noPropertyAccessFromIndexSignature": false
+  }
+}