code: function (str) {
  
  		var self = this;
  
  		if ('i' !== 'I'.toLowerCase()) {
  			// Thanks for http://qiita.com/niusounds/items/fff91f3f236c31ca910f
  			return str.replace(/[a-z]/g, function(ch) {
  				return String.fromCharCode(ch.charCodeAt(0) & ~32);
  			});
  		}
  
  		return str.toUpperCase();
  
  	}
docs: Conver the string to upper case
  @return {String} Converted string