Make friendly URL from any string.

make_url.js

const nodiac = { 'á': 'a', 'č': 'c', 'ď': 'd', 'é': 'e', 'ě': 'e', 'í': 'i', 'ň': 'n', 'ó': 'o', 'ř': 'r', 'š': 's', 'ť': 't', 'ú': 'u', 'ů': 'u', 'ý': 'y', 'ž': 'z' };
/** Friendly URL
 * @param s string with spaces and weird chars.
 * @return string URL friendly
 */
function make_url(s) {
    return s.toLowerCase()
        .split('')
        .map(
            letter => nodiac[letter] || letter
        )
        .join('')
        .replace(/[^a-z0-9_]+/g, '-')
        .replace(/^-|-$/g, '');
}