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From "Paul King (JIRA)" <j...@apache.org>
Subject [jira] [Resolved] (GROOVY-7772) Class.&instanceMethod had better to have same meaning of Class::instanceMethod of Java8
Date Tue, 02 May 2017 02:12:06 GMT

     [ https://issues.apache.org/jira/browse/GROOVY-7772?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Paul King resolved GROOVY-7772.
-------------------------------
       Resolution: Fixed
    Fix Version/s:     (was: 3.0)
                   2.6.0-alpha-1

> Class.&instanceMethod had better to have same meaning of Class::instanceMethod of
Java8
> ---------------------------------------------------------------------------------------
>
>                 Key: GROOVY-7772
>                 URL: https://issues.apache.org/jira/browse/GROOVY-7772
>             Project: Groovy
>          Issue Type: Improvement
>          Components: groovy-runtime
>    Affects Versions: 2.4.6
>            Reporter: UEHARA Junji
>            Assignee: Daniel Sun
>            Priority: Minor
>             Fix For: 2.6.0-alpha-1
>
>
> Groovy's operator .& for method is similar functionality to Java8's method reference
operator ::.
> ||No.||lhs||rhs||meaing of Groovy's .& (Closure) ||meaning of java8's :: (FunctionalInterface)||
> |1|instance|instanceMethod| { ..args -> instance.instanceMethod(args) | same as groovy
|
> |2|Class|staticMethod| { ..args -> Class.staticMethod(args) | same as groovy |
> |3|instance|staticMethod| ERROR groovy.lang.MissingMethodException: | Error same as groovy
(compile error) |
> |4|Class|instanceMethod|error| Function<RetType,Class,Args..>, where method instance
method of Class which is declared as ```RetType instanceMethod(Args..) {...}```. In other
words it is interpreted as a function which takes LHS Class as the first parameter which additionally
inserted to the method.)|
> IMHO, i'd like to propose to change the No 4 pattern semantics of groovy  same as Java
8 's. Because:
>  * You can write:
> {code}
> ["a,b,c"].collect ( String.&toUpperCase )
> {code}
> instaed of
> {code}
> ["a,b,c"].collect { it.toUpperCase() }
> {code}
> * Can have correspond operator to java8's ::. which is understandablea and needed for
Java programmers.



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