Submission: switch (...) instanceof feature (original) (raw)

brucechapman at paradise.net.nz brucechapman at paradise.net.nz
Sun Mar 29 17:47:09 PDT 2009

Quoting Marek Kozieł <develop4lasu at gmail.com>:

This is death path. As I already said every month you will need switch to more complex operations and Java will be come Pyton. 1. String 2. instance of

... n. Unsigned String

WTF?

n+1. ... This syntax should support all those, and even more:

It doesn't support the instanceof form because one feature (the most important feature IMHO) is the implicit downcast of the variable to the type specified by the case. It is also different because it is switching on a variable or identifier, not an expression.

Personally I think closures gives us a good enough (though by no means ideal) solution to this problem. But there is a decision to make, - do we keep adding special language syntax for all verbose idioms, or do we add a few language features that mean we can solve these problems adequately with an API. The fact that ARM has made the first cut suggests the former, so therefore, given this (IMHO poor) choice, I'd at least like my pet issues to have an opportunity to be dealt with in similar fashion.

Bruce

http://lasu2string.blogspot.com/2008/12/string-switch-small-language-changes-on.html

-- Pozdrowionka. / Regards. Lasu aka Marek Kozieł http://lasu2string.blogspot.com/

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