Convert string of text into a slug separated by hyphens with no special characters.

slugify.js

function slugify(text) {
  const a = 'ãàáäâèéëêìíïîòóöôùúüûñçßÿœæŕśńṕẃǵǹḿǘẍźḧ·/_,:;';
  const b = 'aaaaaeeeeiiiioooouuuuncsyoarsnpwgnmuxzh------';
  const p = new RegExp(a.split('').join('|'), 'g');

  return text.toString().toLowerCase()
    .replace(/\s+/g, '-')                    // Replace spaces with -
    .replace(p, c => b.charAt(a.indexOf(c))) // Replace special chars
    .replace(/&/g, '-and-')                  // Replace & with 'and'
    .replace(/[^\w\-]+/g, '')                // Remove all non-word chars
    .replace(/\-\-+/g, '-')                  // Replace multiple - with single -
    .replace(/^-+/, '')                      // Trim - from start of text
    .replace(/-+$/, '');                     // Trim - from end of text
}