Helper functions for react, such as price currency formatting.

Helpers.js

var Helpers = {
    /**
     * @function formatMoney
     * @param {number} n - The number to be formatted
     * @param {string} d - The character to be used for the decimal. Defaults to ".".
     * @param {string} t - the character to be used for the thousands separator. Defaults to ",".
     * @param {int} c - the number of decimal places. Defaults to 2.
     * @returns {string}
     * @description Formats a number to a price
     */
    formatMoney: function(n, d, t, c){
        var c = isNaN(c = Math.abs(c)) ? 2 : c, 
            d = d == undefined ? "." : d, 
            t = t == undefined ? "," : t, 
            s = n < 0 ? "-" : "", 
            i = parseInt(n = Math.abs(+n || 0).toFixed(c)) + "", 
            j = (j = i.length) > 3 ? j % 3 : 0;
            return s + (j ? i.substr(0, j) + t : "") + i.substr(j).replace(/(\d{3})(?=\d)/g, "$1" + t) + (c ? d + Math.abs(n - i).toFixed(c).slice(2) : "");
    }
    
    /**
     * @function getQueryStringParameter
     * @param {string} name - The query string key
     * @param {string} url - An optional url, defaults to the current page
     * @returns {string}
     * @description Returns a value passed in via a querystring parameter
     */
    getQueryStringParameter: function(name, url) {
        if (!url) url = window.location.href;
        name = name.replace(/[\[\]]/g, "\\$&");
        var regex = new RegExp("[?&]" + name + "(=([^&#]*)|&|#|$)"),
            results = regex.exec(url);
        if (!results) return null;
        if (!results[2]) return '';
        return decodeURIComponent(results[2].replace(/\+/g, " "));
    },
};

module.exports = Helpers;