[jira] [Created] (GROOVY-10683) Consider enhancing for loop to provide access to loop index or iterator

["Eric Milles (Jira)" <ji...@apache.org>]

Eric Milles created GROOVY-10683:
------------------------------------

             Summary: Consider enhancing for loop to provide access to loop index or iterator
                 Key: GROOVY-10683
                 URL: https://issues.apache.org/jira/browse/GROOVY-10683
             Project: Groovy
          Issue Type: New Feature
          Components: parser-antlr4
            Reporter: Eric Milles


When iterating over an array or iterable, there is choice between traditional counting loop for index access, declaring/managing an external variable to leverage for-each loop, or switching to {{eachWithIndex}} which requires quite a bit more runtime investment.
{code:groovy}
for (int i = 0, n = array.length; i < n; i += 1) {
  def val = array[i]
}
int idx = 0; for (val in array) {
  idx += 1;
}
// idiomatic and takes care of all the management, but lacks STC support for primitive arrays and adds the cost of method invocation for each iteration
array.eachWithIndex { val, idx ->
}
{code}

Please consider the possibility of {{for}} loop enhancements of [Gosu|https://gosu-lang.github.io/docs.html], which provides a direct syntax for index or iterator:
{code}
for (val in array index idx) {
}
for (value in iterable iterator iter) {
}
{code}



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