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Some background: I'm coming from Prototype and am used to using Prototype's Template class for doing repeated updates from a stored template. Y.substitute seems like the correct method to use for this, but I'm having trouble wrapping my head around it.

Is there an example of using the third argument, the function callback, in the wild?

Also, I noticed that substitute doesn't play well with YUI 3's OOP infrastructure, e.g.

[gist=391551]Substitute doesn't get properties of YUI objects.[/gist]

Any advice on making these two work together better, rather than writing a toObject() serializer?

Edit: Here's the gist. Unsure why it's not working inline.

Thanks, that's a big help. We're still struggling with using more complex templates (e.g. accessing properties of properties), but this works for subclasses of Y.Base.