Created
January 19, 2011 01:43
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| 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"] |
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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.