TEST =: 3 : 0
    for_NAME. y do.
      select. NAME
      case. 0 do. echo 'this'
      case. 1 do. echo 'that'
      case. do. echo 'etc'
      end.
    end.
  )

as used:

     TEST i.3
  this
  that
  etc

That's the second 'for' at https://code.jsoftware.com/wiki/Vocabulary/fordot

On 2020-02-14 15:25, PMA wrote:
Hi J Gurus,

Please forgive an awfully naive question.
Here it is in sorta-J context --

TEST =: 3 : 0
  For each item (an integer) in y
  do.
    How can I NAME the item, in order to
    select. NAME and then run
      case. 0 do. this
      case. 1 do. that, etc., against it?
    end.
  end.
)

Thanks in advance,
Pete
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