safe eachIn method for object iteration in javascrip

jQuery.eachIn.js

jQuery.extend(jQuery, {
	"eachIn": function(obj, callback) {
		var ensureHas = function(key, val) {
			if (obj.hasOwnProperty(key)) {
				return callback(key, val);
			}
		}
		return this.each(obj, ensureHas);
	}
});