a.test.ts

import { expect, test } from "bun:test";

function solution(input: string) {
    const lines = input.split("\n");
    const ans = lines.reduce((acc, line) => {
        let i = 0;
        let j = line.length - 1;
        let d = "";
        while (i < line.length) {
            const symb = line[i];
            if (symb >= "0" && symb <= "9") {
                d += symb;
                break;
            }
            i++;
        }
        while (j > -1) {
            const symb = line[j];
            if (symb >= "0" && symb <= "9") {
                d += symb;
                break;
            }
            j--;
        }
        return acc + Number(d);
    }, 0);

    return ans;
}

test("example-a", async () => {
    const file = Bun.file("./01/example-a.txt");
    const input = await file.text();

    const actual = solution(input);
    const expected = 142;
    expect(actual).toBe(expected);
});

test("puzzle input", async () => {
    const file = Bun.file("./01/input.txt");
    const input = await file.text();

    const actual = solution(input);
    const expected = 53194;
    expect(actual).toBe(expected);
});