JavaScript slug generator

slug.js

// Generates a URL-friendly "slug" from a provided string.
// For example: "This Is Great!!!" transforms into "this-is-great"
function generateSlug (value) {
  // 1) convert to lowercase
  // 2) replace anything that's not an alphanumeric character or dash with a dash
  // 3) replace instances of more than one dash with a single dash
  // 4) remove leading and trailing dashes
  return value.toLowerCase().replace(/[^a-z0-9-]/g, '-').replace(/-+/g, '-').replace(/^-|-$/g, '');
};