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https://issues.apache.org/jira/browse/GROOVY-6992?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Eric Milles closed GROOVY-6992.
-------------------------------
Resolution: Fixed
As of Groovy 4, the {{collect}} variants that accept a collector propagate the
collector's type. For example:
{code:groovy}
@groovy.transform.TypeChecked
void test() {
def one_two_three = [1,2,3]
@groovy.transform.ASTTest({
println
node.getNodeMetaData(org.codehaus.groovy.transform.stc.StaticTypesMarker.INFERRED_TYPE)
})
def two_times = one_two_three.collect(new HashSet<Number>()) { it * 2 }
}
test()
{code}
This script prints "java.util.HashSet<java.lang.Number>" for the inferred type
of {{two_times}}. This lets you control the type and carry on with that type
instead of having to cast from {{Collection}} as before.
> Support collect on sets
> -----------------------
>
> Key: GROOVY-6992
> URL: https://issues.apache.org/jira/browse/GROOVY-6992
> Project: Groovy
> Issue Type: Improvement
> Affects Versions: 2.3.6
> Reporter: Mark Perry
> Priority: Major
>
> At the moment, calling collect on sets returns a list. You can pass in a set
> as a collection to add to, but then the return type is collection, which is
> not what you want.
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