A stack-based concatenative programming language.
There's the definition of factorial:
"fac"
<=1 branch:[pop 1],[dup -1 fac *] ;
or:
"fac"
"fac_iter:n,res"
$n <=1 branch:[$res],[
$n $res * ->res // n * res -> res
$n -1 ->n // n - 1 -> n
fac_iter:{$n},{$res}
]
;
fac_iter:?,1
;
and there's an example of putting the sequence 1, 2, 3... onto the stack, with 1 at the top of the stack.
"iota"
<=1 branch:[pop 1],[dup -1 iota] ;
a generalized version of iota:
"iota:start,step,end"
$start >end branch:[],[iota:{$start $step +},{$step},{$end} $start] ;
iota:1,2,10 // 1, 3, 5, 7, 9
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