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bmizerany/done.rb

Created January 19, 2011 01:43
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done.rb
def doit(&blk)
if blk.arity == 2
blk.call("mydata", false)
blk.call(nil, true)
else
blk.call("mydata")
end
end
doit {|data, done| p [data, done] }
# ["data", false]
# [nil, true]
doit {|data| p [data] }
# ["data"]
@ismasan
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ismasan commented Jan 19, 2011

By "foo" you mean "doit", right?

@philc
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philc commented Jan 19, 2011

It's clever and feels like fork. What's the alternative look like side by side?

@mloughran
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It's compact but confusing as a pattern. Wouldn't it be better to use a deferrable for the 'doneness' and return some kind of event emitter so that you can attach callbacks to the other events you're interested in.

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