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Posted to notifications@groovy.apache.org by "Eric Milles (Jira)" <ji...@apache.org> on 2025/03/23 20:43:00 UTC

[jira] [Created] (GROOVY-11585) instanceof with parameterized type

Eric Milles created GROOVY-11585:
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             Summary: instanceof with parameterized type
                 Key: GROOVY-11585
                 URL: https://issues.apache.org/jira/browse/GROOVY-11585
             Project: Groovy
          Issue Type: Bug
            Reporter: Eric Milles
            Assignee: Eric Milles


The {{instanceof}} operator supports parameterized types.  However, the types are erased at runtime, so the check can be improper.  For example:
{code:groovy}
def list = [1,2,3]
if (list instanceof List<String>) {
  // yes List but not of String
}
{code}



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