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Re:The Array Cast – A podcast about the array programming la... by rscho on Thursday May 20, 2021 @03:18PM (#27225765)
From the J docs: https://www.jsoftware.com/help/dictionary/dx005.htm

  nub=: (i.@# = i.~) # ]
     5!:2 <'nub'
  +-------------------+-+-+
  |+--------+-+------+|#|]|
  ||+--+-+-+|=|+--+-+|| | |
  |||i.|@|#|| ||i.|~||| | |
  ||+--+-+-+| |+--+-+|| | |
  |+--------+-+------+| | |
  +-------------------+-+-+
... so J functions have an array representation, at least.
Re:The Array Cast – A podcast about the array programming la... by rklmno on Saturday May 22, 2021 @11:38PM (#27252228)
Yes, each J function has several array representations.