Sencha Touch: Ext version of jQuery methods

I'm trying to use as many native parts of Ext as I can without leaning on other libraries. It's not so much that I wouldn't use the other libraries anyway, but it's better to embrace change. There's a lot of useful stuff that Underscore handles really well.

jQuery	Underscore	Ext (Sencha Touch)
jQuery.noop		Ext.emptyFn
jQuery.proxy		Ext.bind
jQuery('selector')		Ext.query('selector')
jQuery.trim		Ext.String.trim
[jQuery wrapped elem] = jQuery('selector')		[Ext wrapped elem] = Ext.get([from Ext.query])
	_.isEmpty, _.isNull	Ext.isEmpty