// Created on savesnippets.com · https://savesnippets.com/sQrmydQ0bNikS7
function slugify(str) {
  return str
    .normalize('NFD')                     // decompose accented chars
    .replace(/[̀-ͯ]/g, '')      // strip accent marks
    .toLowerCase()
    .trim()
    .replace(/[^a-z0-9\s-]/g, '')        // remove non-alphanumeric
    .replace(/[\s]+/g, '-')              // spaces → hyphens
    .replace(/-+/g, '-');                // collapse multiple hyphens
}

// Usage
console.log(slugify('Hello World!'));           // hello-world
console.log(slugify('  Über Café  '));          // uber-cafe
console.log(slugify('10 Reasons to Use JS'));   // 10-reasons-to-use-js