port-fold[procedure] port-fold port reader op . seeds
Scsh: Applys reader on port repeatedly,
until it returns eof. The first value v0 returned
by reader will be passed to op with seeds,
as (op v0 . seeds). This should return
a new set of seed values, which will be passed with
the next value returned by reader, and so on.
See also port->list.
numero rio
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