Filippos Vasilakis vasilakisfil
havenwood
/ arity_range.rb
Last active
August 29, 2015 13:56
Ask a method, lambda or proc for the range of arguments it can be called with from minimum to maximum.
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| module ArityRange | |
| def arity_range | |
| args = parameters.map &:first | |
| req = args.count :req | |
| opt = args.include?(:rest) ? Float::INFINITY : args.count(:opt) | |
| keyreq = args.count :keyreq | |
| keyopt = args.include?(:keyrest) ? Float::INFINITY : args.count(:key) |
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