Convert string to slug

slugify.js

function slugify (text) {
    const a = 'àáãäâèéëêìíïîòóöõôùúüûñçßÿœæŕśńṕẃǵǹḿǘẍźḧ·/_,:;';
    const b = 'aaaaaeeeeiiiiooooouuuuncsyoarsnpwgnmuxzh------';
    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
}