some universal helper functions i frequently grab

Util.js

var Util = window.Util || {};

/**
 * Generic utility functions
 */

Util = (function() {
  'use strict';

  return {
    // safari toLocaleString() just returns same as toString(), rather than inserting commas for en-US
    // so add commas and other formatting specific to US
    toUSLocaleNumber: function(x) {
      return x.toString().replace(/\B(?=(\d{3})+(?!\d))/g, ',');
    },

    // returns true if current document is not the top most document
    isFramed: function() {
      return (window.self !== window.top);
    },

    // returns all URL params as key-value pairs
    // via https://css-tricks.com/snippets/jquery/get-query-params-object/
    getQueryParameters: function(str) {
      return (str || document.location.search).replace(/(^\?)/,'').split("&").map(function(n){return n = n.split("="),this[n[0]] = n[1],this}.bind({}))[0];
    },

    // performs replacement on query params in a given elements href attr
    setQueryParamVal: function(param, val, uri) {
      var re = new RegExp('([?|&])' + param + '=.*?(&|$)', 'i'),
          sep = uri.indexOf('?') !== -1 ? '&' : '?';

      uri = uri ? uri : document.location.href;

      if (uri.match(re)) {
        uri = uri.replace(re, '$1' + param + '=' + val + '$2');
      } else { // just add it to the end
        uri = uri + sep + param + '=' + val;
      }

      return uri;
    },

    // does a simple string replace for %S
    // but do it safely because we might have to pass null as the pattern
    stringReplace: function(text,template) {
      if (template == null) {
        return text;
      } else {
        return template.replace('%S',text);
      }
    },

  }
}());