gistfile1.js

Type.extend({

		/*
		*	BOM/DOM iterable objects are: array, arguments, nodeList
		*		- from bigger picture, iterable javascript objects has to support length and [] -> index access
		*		- but index access can't be tested.. :-(
		*		- also, for safari typeof nodeList == function.. 
		*		- and length property has also string or function, which are uniterable
		*		- so duck typing ftw!
		*/
		isIterable: function(item) {
			return !!(item && (item.item || item.callee || item.__type == 'array'));
		}

	});

"Type.isIterable": function() {
		QWE()(function() {
			value_of(Type.isIterable(arguments)).should_be(true);
			value_of(Type.isIterable([])).should_be(true);
			value_of(Type.isIterable(document.childNodes)).should_be(true);

			value_of(Type.isIterable(null)).should_be(false);
			value_of(Type.isIterable('qwe')).should_be(false);
			value_of(Type.isIterable(undefined)).should_be(false);
			value_of(Type.isIterable(true)).should_be(false);
			value_of(Type.isIterable({})).should_be(false);
			value_of(Type.isIterable(function() { })).should_be(false);
			value_of(Type.isIterable(45)).should_be(false);
			value_of(Type.isIterable(new Date())).should_be(false);
			value_of(Type.isIterable(/df/)).should_be(false);
		});
	},