I have a complex JS object. It manipulates the page DOM.  Inside it I have many repetitive selections spread across functions.  I would like to cache the selectors to enhance performance.  How do other people do this? I can cache on the function level but not the object.  When I try to cache on the object level I seemingly end up with stale selectors that while defined don't actually work.  

My gut is that I can only cache on the function level?

Sorry if this has been asked before what I have read does not deal with caching inside a JS object.