[WIP] Add arrows intro #8
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Readin'. |
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| \section{Arrows in Haskell} | |||
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| If all that computer programs do would be to operate on a fixed number of inputs | |||
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Didn't you already talk about something similar in the intro? If not, then I think this paragraph maybe better fits the intro.
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In some sense yeah, and clearly I'd need to align these parts, but I don't think repetition hurts.
The question is, can we just talk about arrows as the general interface to computation they are, or do we have go into their genesis as generalization of monads. If the latter is the case, then I think this here makes a good intro.
I would go ahead saying: As briefly mentioned before, there was already an earlier Haskell feature inspired by cats that was meant to encapsulate notions of computation, but it turned out to be unfit for some applications. Thus Hughes introduced the above interface instead, where he clearly built upon understanding won from monads.
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In some sense yeah, and clearly I'd need to align these parts, but I
don't think repetition hurts.
Sure
The question is, can we just talk about arrows as the general
interface to computation they are, or do we have go into their
genesis as generalization of monads. If the latter is the case, then
I think this here makes a good intro.
So, I think you can present them as being independent of Monads, but
still give some links / examples using mondas for ease of understanding.
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Anyway, I think it's OK the way it is now, I'm not feeling picky and these are merely suggestions. |
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Integrated. |
| instance Arrow (->) where | ||
| arr f = f | ||
| (>>>) f g = (.) g f | ||
| first f = \textbackslash(x, y) -> (f x, y)\textrm{,} |
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The \textbackslash seems to produce the following warning:
Chapter 2.
(./chapters/arrows-practice.tex [5] [6]
LaTeX Font Warning: Font shape `OMS/cmtt/m/n' undefined
(Font) using `OMS/cmsy/m/n' instead
(Font) for symbol `textbackslash' on input line 119.
) (./chapters/freyd-cats.tex [7] [8]) [9]
Do you also get this?
Is there no better way to do this?
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Perhaps I'll merge this now? |
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Yeah, I'll open an issue with the leftover TODOs as a reminder. |
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👍 |
TODO: