jext

for_j. arg 0 do.
  echo j
end.

NB. compiles to

main =: monad define
  argv =: y
  arg =: monad define
    ". > y { argv
  )
  for_j. arg 0 do.
    echo j
  end.
)
main '2 3 4' ; '3' NB. invoked from command line as `jext test.jxt "2 3 4" 3`