wrapper around all the console methods so you can turn enable/disable them.

logger.js

(function(window){
  "use strict";
  
  /**
   * Wrap console methods to turn them on/off with a flag
   * Plus stub console methods for older browsers without console
   *
   * @param {boolean} debugFlag 
   */
  function Logger(debugFlag){
    this.debug = debugFlag || false;
  }
  // borrowed from https://github.com/h5bp/html5-boilerplate/blob/master/dist/js/plugins.js
  var method;
  var noop = function () {};
  var methods = [
    'assert', 'clear', 'count', 'debug', 'dir', 'dirxml', 'error',
    'exception', 'group', 'groupCollapsed', 'groupEnd', 'info', 'log',
    'markTimeline', 'profile', 'profileEnd', 'table', 'time', 'timeEnd',
    'timeline', 'timelineEnd', 'timeStamp', 'trace', 'warn'
  ];
  var length = methods.length;
  var console = (window.console = window.console || {});

  while (length--) {
    method = methods[length];

    // Only stub undefined methods. 
    if (!console[method]) {
      console[method] = noop;
    }
    // setup our Logger wrapped methods as well
    Logger.prototype[method] = new Function(
      'if (this.debug){console.'+method+'.apply(console, arguments);}'
    )
    Logger.prototype[method].bind(Logger);
  }
  
  // example usage:
  window.logger = new Logger(/* pass a bool here, I use ?debug and read location.search on page load */);
})(window)