Ticket #16 (new defect)

Opened 6 years ago

Rename 'mealy' function

Reported by: conal Owned by:
Priority: major Milestone:
Version: Keywords:
Cc:

Description

As Robin Green pointed out

On Mon, 24 Nov 2008 20:27:34 -0800 "Conal Elliott" <conal@…> wrote:

I renamed 'stateE' and 'stateE_' to' mealy' and 'mealy_' in reactive-0.9.4 (just released). I've been meaning to change these names for a while now. I prefer these new names as being more clear & specific and connecting clearly to automata theory rather than to imperative programming.

I don't think mealy is as general as a Mealy machine, so this seems misleading. A Mealy machine can jump to different states depending on its input. If 's' is the state type, and 'b' the input type (which seems to me to be the natural way to interpret it), that "conditional jumping" feature isn't present.

I think

\f g a e -> f <$> scanlE g a e

is precisely a *Moore* machine, though? If so, scanlE is a particular kind of Moore machine in which f is the identity. And so are the other scanl* functions in the library - right? -- Robin

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