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From "Bruno P. Kinoshita (JIRA)" <j...@apache.org>
Subject [jira] [Resolved] (FUNCTOR-24) Change default arity of Function, Procedure and Predicate
Date Tue, 30 Jul 2013 23:03:49 GMT

     [ https://issues.apache.org/jira/browse/FUNCTOR-24?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Bruno P. Kinoshita resolved FUNCTOR-24.
---------------------------------------

    Resolution: Fixed

Changed default arity of Function, Procedure and Predicate, from 0 to 1.
                
> Change default arity of Function, Procedure and Predicate
> ---------------------------------------------------------
>
>                 Key: FUNCTOR-24
>                 URL: https://issues.apache.org/jira/browse/FUNCTOR-24
>             Project: Commons Functor
>          Issue Type: Improvement
>            Reporter: Bruno P. Kinoshita
>            Assignee: Bruno P. Kinoshita
>            Priority: Minor
>
> From http://markmail.org/message/ion6fk6hroh5zmzn
> Java 8 (project lambda) [1] and Google Guava [2] have a default arity of 1 for these
interfaces (i.e. Function is a unary function). But in [functor] the default arity is 0 (i.e.
nullary).
> It would be a good idea for [functor] to have a similar behaviour to the other API's,
so users and developers can use the interfaces with less hassle. 
> Other functional programming languages let the user specify the arity when declaring
the function (like in Haskell), but in [functor] we have special interfaces per arity.
> [1] http://docs.guava-libraries.googlecode.com/git/javadoc/com/google/common/base/Function.html#apply(F)
> [2] http://docs.guava-libraries.googlecode.com/git/javadoc/com/google/common/base/Function.html#apply(F)

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