Slugify makes a string URI-friendly

slugify.js

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

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