• (chan)
  • (chan buf-or-n)
  • (chan buf-or-n xform)
  • (chan buf-or-n xform ex-handler)
Creates a channel with an optional buffer, an optional transducer
(like (map f), (filter p) etc or a composition thereof), and an
optional exception-handler.  If buf-or-n is a number, will create
and use a fixed buffer of that size. If a transducer is supplied a
buffer must be specified. ex-handler must be a fn of one argument -
if an exception occurs during transformation it will be called with
the Throwable as an argument, and any non-nil return value will be
placed in the channel.