What is your rationale for doing so? I think the MVC (model-view-controller) paradigm is most popular in terms of architecture, and I've heard Mate and PureMVC are simpler than others.
In general, I would think methods would be with the components that own them. The only other reason I would externalize them is because they are similar in some way, utility functions, etc.
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It's become a habit now, was just wondering...
When I get error/problem with the files separated I can easily tell where it's coming from with a quick glance.
resource : what functionName
path : what component is giving off the error
When the functions are all in one, then error/problem is very generic and hard to tell what function is giving off the error and what component is triggering it...
resource : fileName.mxml
path : /folderName/src