latin to Persian number pure JS function

toPersianNumber.js

/**
* persian number Function that get latin number and returns Persian numbers in small vanilla js function
* 
* @param {string|number} v
* @returns {string}
*/

var toPersianNumber: function(v) {
        var PersianNumber = ['۰', '۱', '۲', '۳', '۴', '۵', '۶', '۷', '۸', '۹'];
        var vString = v.toString();
        var chars = vString.split('');

        for (var i = 0; i < chars.length; i++) {
            if (/\d/.test(chars[i])) {
                chars[i] = PersianNumber[chars[i]];
            }
        }
        return chars.join('');
}