AoC2025: day 6 part 1

Author: martapanc

2024-2025/src/2025/day06/day06.test.ts

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+import {part1, part2} from "./day06";
+
+describe('2025 Day 6', () => {
+    test('Part 1', async () => {
+        expect(await part1('testInput1')).toEqual(4277556);
+        expect(await part1('input')).toEqual(5877594983578);
+    });
+
+    test('Part 2', async () => {
+        // expect(await part2('testInput1')).toEqual(31);
+        // expect(await part2('input')).toEqual(29379307);
+    });
+});

2024-2025/src/2025/day06/day06.ts

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+import path from "node:path";
+import {readInputLineByLine} from "@utils/io";
+import {forEach} from "mathjs";
+
+export async function part1(inputFile: string) {
+    return await day6(inputFile, calcGrantTotal);
+}
+
+export async function part2(inputFile: string) {
+    return await day6(inputFile);
+}
+
+async function day6(inputFile: string, calcFn?: (numberRows: number[][], ops: string[]) => number) {
+    const inputPath = path.join(__dirname, inputFile);
+    const lines = await readInputLineByLine(inputPath);
+
+    const numberRows: number[][] = lines.slice(0, -1).map(line => line.trim().split(/\s+/).map(Number));
+    const ops: string[] = lines[lines.length - 1].split(/\s+/);
+
+    return calcFn?.(numberRows, ops);
+}
+
+function calcGrantTotal(numberRows: number[][], ops: string[]): number {
+    let total: number = 0;
+    const cols = numberRows[0].length;
+    for (let i = 0; i < cols; i++) {
+        const op = ops[i];
+        const column: number[] = numberRows.map(row => row[i]);
+        const result = column.reduce((acc, cur) => op === '+' ? acc + cur : acc * cur, op === '+' ? 0 : 1);
+        total += result;
+    }
+    return total;
+}

2024-2025/src/2025/day06/testInput1

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+123 328  51 64 
+ 45 64  387 23 
+  6 98  215 314
+*   +   *   +