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Re: Passing Str or undef ?

by stvn (Monsignor)
on Apr 26, 2011 at 15:35 UTC ( #901380=note: print w/ replies, xml ) Need Help??


in reply to Passing Str or undef ?

Corion actually answered the question, but only by guessing, so I will restate his answer but with some more details and certainty.

You have two choices here really, the first is a type union, which is written as Str | Undef and this basically says that the value can be either a String or Undefined. The second choice is the Maybe[`a] parameterized type, which would be written like this Maybe[Str]. This gives you basically the same thing as the type union but communicates the relationship differently by more explicitly saying "this *might* be undefined" not "this *can also* be undefined". My personal choice is always to do Maybe[`a] instead of the union in cases like these.

-stvn


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Re^2: Passing Str or undef ?
by John M. Dlugosz (Monsignor) on Apr 27, 2011 at 11:13 UTC
    Yes, thanks. I like the apparent semantics better of Maybe.

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