Checks whether the given string (or object) is blank

jquery.is_blank.js

(function($){
  $.isBlank = function(string){
    return(!string || $.trim(string) === ""); 
  };
})(jQuery);

$.isBlank(" ") //true
$.isBlank("") //true
$.isBlank("\n") //true
$.isBlank("a") //false

$.isBlank(null) //true
$.isBlank(undefined) //true
$.isBlank([]) //true

@yckart Hey, here form the future to tell you that for (var prop in obj) if (obj[prop]) return false will return false for additional properties on the prototype chain and this might not be the desired behavior; it would be wise to use for (var prop in obj) if (obj.hasOwnProperty(key) && obj[key]) return false. Also jQuery, is this thing still around?