Slugify cell range in Google Sheets

You can write your own functions in Google Sheets, so you can put your very own slugify function:

function normalize(input) {
    /*
     * Normalize text in multiple cells
     */
    if (input.map) {
        // Test whether input is an array.
        // https://developers.google.com/apps-script/guides/sheets/functions#optimization
        // Recurse over array if so.
        return input.map(slugify);
    } else {
        let normalized = input.normalize("NFD").replace(/[\u0300-\u036f]/g, "");
        normalized = normalized.replace('Ł', 'L').replace('ł', 'l')
        return normalized
    }
}

function slugify(input) {
    /*
     * Slugify text in multiple cells
     */
    if (input.map) {
        return input.map(slugify);
    } else {
        slug = normalize(input).toLowerCase();
        return slug.replace(/\s+/g, '-');
    }
}

It will work with arrays 🙂

Thx @khushalbokadey for the hint and Lewis Diamond for pointing out the normalize function.