day 1

.vscode/settings.json

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+{
+    "deno.enable": true
+}

1/task.ts

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+export async function solveTask1part1() {
+    const decoder = new TextDecoder("utf-8");
+    const inputData = await Deno.readFile('./1/input.txt');
+    const input = decoder.decode(inputData);
+    
+    // console.log(input.substring(0,50) + '...');
+    const lines = input.split('\n')
+        .filter( l => l.trim() !== '');
+    console.log('lines', lines.slice(0, 5));
+
+    const lefts = lines.map( line => {
+        const leftStr = line.substring(0, line.indexOf(' ')).trim();
+        const left = parseInt(leftStr);
+        return left
+    }).sort();
+    const rights = lines.map( line => {
+        const rightStr = line.substring(line.indexOf(' ')).trim();
+        const right = parseInt(rightStr);
+        return right
+    }).sort();
+    console.log('lefts', lefts.slice(0, 5));
+    console.log('rights', rights.slice(0, 5));
+
+    const diffs = []
+    for (let i = 0; i < lines.length; i++) {
+        const left = lefts[i];
+        const right = rights[i];
+        diffs.push(Math.abs(right - left));
+    }
+    
+    const diffSum = diffs
+        .reduce( (p, c) => p + c, 0);
+    console.log('diffSum', diffSum);
+}
+
+export async function solveTask1part2() {
+    const decoder = new TextDecoder("utf-8");
+    const inputData = await Deno.readFile('./1/input.txt');
+    const input = decoder.decode(inputData);
+    
+    const lines = input.split('\n')
+        .filter( l => l.trim() !== '');
+    console.log('lines', lines.slice(0, 5));
+
+    const lefts = lines.map( line => {
+        const leftStr = line.substring(0, line.indexOf(' ')).trim();
+        const left = parseInt(leftStr);
+        return left
+    }).sort();
+    const rights = lines.map( line => {
+        const rightStr = line.substring(line.indexOf(' ')).trim();
+        const right = parseInt(rightStr);
+        return right
+    }).sort();
+    console.log('lefts', lefts.slice(0, 5));
+    console.log('rights', rights.slice(0, 5));
+
+    const scores = []
+    let iR = 0;
+    for (let i = 0; i < lines.length; i++) {
+        const left = lefts[i];
+        let multiplyer = 0;
+        while (rights[iR] < left) {
+            iR++;
+        }
+        while (rights[iR] === left) {
+            multiplyer++;
+            iR++;
+        }
+        scores.push(left * multiplyer);
+    }
+    
+    const scoreSum = scores
+        .reduce( (p, c) => p + c, 0);
+    console.log('scoreSum', scoreSum);
+}

deno.json

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+{
+  "tasks": {
+    "dev": "deno run --watch main.ts"
+  },
+  "imports": {
+    "@std/assert": "jsr:@std/assert@1"
+  }
+}

deno.lock

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+{
+  "version": "4",
+  "specifiers": {
+    "jsr:@std/assert@1": "1.0.9",
+    "jsr:@std/internal@^1.0.5": "1.0.5"
+  },
+  "jsr": {
+    "@std/assert@1.0.9": {
+      "integrity": "a9f0c611a869cc791b26f523eec54c7e187aab7932c2c8e8bea0622d13680dcd",
+      "dependencies": [
+        "jsr:@std/internal"
+      ]
+    },
+    "@std/internal@1.0.5": {
+      "integrity": "54a546004f769c1ac9e025abd15a76b6671ddc9687e2313b67376125650dc7ba"
+    }
+  },
+  "workspace": {
+    "dependencies": [
+      "jsr:@std/assert@1"
+    ]
+  }
+}

main.ts

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+import { solveTask1part1, solveTask1part2 } from "./1/task.ts";
+
+await solveTask1part1();
+await solveTask1part2();

main_test.ts

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+import { assertEquals } from "@std/assert";