Vanilla JavaScript Slugify + Accent removal - Just another JavaScript Slugifier with an extra line for Accent Removal

slugify.js

function slugify(text) {
  return text.toString().toLowerCase().trim()
	.normalize('NFD') 				 // separate accent from letter
	.replace(/[\u0300-\u036f]/g, '') // remove all separated accents
	.replace(/\s+/g, '-')            // replace spaces with -
	.replace(/&/g, '-and-')          // replace & with 'and'
	.replace(/[^\w\-]+/g, '')        // remove all non-word chars
	.replace(/--+/g, '-')            // replace multiple '-' with single '-'
}

NFD takes care of all diacritics. So anything that's above or below the character.

It doesn't modify the actual component of the word. So Äpfel has the diacritic removed and becomes Apfel. Türkçe becomes Turkce. It doesn't change ä to ae it just removes the diacritics that are above and below the character. I've used it mainly for French and Romanian to generate URLs from Titles. Places where the written word without diacritics is exactly the same: mămăligă is written mamaliga.

So yeah ß doesn't get converted to anything because it doesn't have any upper or lower accents.

Finally it made click and I believe to understand, what NFD does! Thank you very much for your efforts, @eek ! :-)