[jira] [Commented] (GROOVY-8929) Inconsistent equals and hashCode for arrays

["Paul King (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/GROOVY-8929?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16722979#comment-16722979 ] 

Paul King commented on GROOVY-8929:
-----------------------------------

We follow Java's practice here:
https://stackoverflow.com/questions/744735/java-array-hashcode-implementation
TL;DR: you want to use {{Arrays.hashCode(a)}} etc. in this case.

> Inconsistent equals and hashCode for arrays
> -------------------------------------------
>
>                 Key: GROOVY-8929
>                 URL: https://issues.apache.org/jira/browse/GROOVY-8929
>             Project: Groovy
>          Issue Type: Bug
>    Affects Versions: 2.4.14
>            Reporter: Albert Fernández Marsal
>            Priority: Major
>
> {code}
> 09:29:~$ groovysh
> Groovy Shell (2.4.14, JVM: 1.8.0_171)
> Type ':help' or ':h' for help.
> ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
> # int[]
> groovy:000> a = [1,2,3] as int[]
> ===> [1, 2, 3]
> groovy:000> a.class
> ===> class [I
> groovy:000> b = [1,2,3] as int[]
> ===> [1, 2, 3]
> groovy:000> b.class
> ===> class [I
> groovy:000> a == b
> ===> true
> groovy:000> a.hashCode()
> ===> 1329315688
> groovy:000> b.hashCode()
> ===> 1489933928
> # String[]
> groovy:000> c = ['a', 'b'] as String[]
> ===> [a, b]
> groovy:000> d = ['a', 'b'] as String[]
> ===> [a, b]
> groovy:000> c == d
> ===> true
> groovy:000> c.hashCode()
> ===> 319689067
> groovy:000> d.hashCode()
> ===> 6422064
> groovy:000>
> {code}



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