Moreshell tricks: first class lists, jq, and the es shell(alurm.github.io)

    ysh-0.34$ var li = :| a b c -- d e f |  # shell word style, ['a', 'b'] style is also accepted

    ysh-0.34$ = li  # pretty print with =
    (List)  ['a', 'b', 'c', '--', 'd', 'e', 'f']

    ysh-0.34$ = li.indexOf('--')
    (Int)   3

    ysh-0.34$ func splitBy(li) {
            >   var i = li.indexOf('--')
            >   assert [i !== -1]
            >   return ( [li[ : i], li[i+1 : ]] )  # same slicing as Python
            > }

    ysh-0.34$ var front, back = splitBy(li)

    ysh-0.34$ = front
    (List)  ['a', 'b', 'c']

    ysh-0.34$ write -- @back
    d
    e
    f

  if .["found"] then
    . | .after += [$arg]
  elif $arg == "--" then
    . | .found = true
  else
    . | .before += [$arg]
  end

  for (i = $indicies) if { ~ $*($i) -- } {
      before = <= {
  ...

  my ($before, $after) = split /\s*--\s*/, $input;
  my @list1 = split ' ', $before;
  ...

    split-on-ddash outputa outputb a b c -- x y z
    for x in "${outputa[@]}"; do # ...