Nonogram starter

nonograms_starter.js

// Calculate the overlap for a single row
const row = (len, nums) => {
    let overlap = len - (nums.reduce((a, n) => a + n) + nums.length - 1);

    return nums.some((n) => n > overlap) ? overlap : Infinity;
};

// Calculate the overlap for many rows
const rows = (len, rows) =>
    rows.map((nums) => ({
        name: JSON.stringify(nums),
        value: row(len, nums),
    })).filter(({ value }) => value !== Infinity);

// Calculate the overlap for a nonograms.org puzzle (old interface)
const nonograms_org = () => {
    // Top row
    const tr = $('.nmtt');
    const cols = tr.innerText.split('\n\n\n').map(r => r.split('\n\t\n'));
    const arr = [];
    for (let i = 0; i < cols[0].length; i++) {
        arr[i] = cols.map(c => c[i]);
    }
    const top_numbers = arr.map((row) => row
        .filter((n) => n.match(/\d+/))
        .map((n) => Number.parseInt(n))
    );
    const width = top_numbers.length;

    // Left row
    const lr = $('.nmtl');
    const left_numbers = lr.innerText
        .trim()
        .split('\n\n\n')
        .map((r) => r.trim()
            .split(/\s+/)
            .map((n) => Number.parseInt(n))
        );
    const height = left_numbers.length;

    const left_row = rows(width, left_numbers);
    const top_row = rows(height, top_numbers);

    return { top_row, left_row };
}

nonograms_org()