On 30 Jan 2009, at 14:49, James Byrne wrote:

Pardon my ignorance, but exactly what does _fu mean WRT Ruby plugins,
gems and such?

I have run across this suffix a number of times in Ruby and Rails,
always in connection with some add-on or extension.  In the original
context that I encountered '_fu' I inferred that it probably stood for
file upload.  However, its widespread use in other contexts evidently
disproves this interpretation. So, does it have a meaning?  Does it
derive from the foo in foobar? Does it stand for functional update? Or,
is it an obscure cultural reference to Ruby's Japanese origins?

Think 'Kung Fu' and you're getting there. It's a bit like The Force. Or what Robert M. Pirsig calls 'gumption'.

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