I'm actually a fan of using Unicode in my code. As people like to say, code
is read more often than it's written, so I'm willing to make typing a bit
harder in return for making the code prettier.
Happily, typing Unicode characters is quite easy with a good editor
(Emacs). I use the TeX input mode which just lets me use TeX names for
symbols, but somebody has actually written a Haskell-specific mode which
might be even better[1]. I might try it some day.
One peculiar habit I have is using x₁ x₂ x₃ instead of x1, x2, x3 or x_1,
x_2, x_3. I definitely find the Unicode version easier to read and work
with, although it probably helps that Emacs highlights the number in a
different color.
Unfortunately, this is a minority opinion at the moment. Even in *this* day
and age, people still find Unicode too difficult to type!
For my internal code, this is not a problem, but it's kept me from putting
any Unicode in public APIs. Shame.
I also don't use UnicodeSyntax because Emacs can do most of the
transformations transparently for me without changing the underlying file.
You can turn this on by setting `haskell-font-lock-symbols' to t. I find it
makes for much nicer code that's easier to read and, even more importantly,
easier to skim.
[1]: https://github.com/roelvandijk/emacs-haskell-unicode-input-method
On Thu, Apr 24, 2014 at 12:51 PM, Roel van Dijk
I think it is a nice feature if used sparingly.
Note that while Unicode symbols are a normal part of the Haskell language you can also turn on some Unicode syntax using the UnicodeSyntax [1] language extension. This means the following will be accepted by GHC:
(∈) ∷ ∀ α. Eq α ⇒ α → [α] → Bool (∈) = elem
You might want to take a look at some packages I created that define some Unicode symbols for common operators and values [2, 3, 4].
Opinions on whether this is a good idea vary. My anecdotal observation is that it seems to be used more by people who speak a native language that is already poorly served by ASCII. Perhaps because they are already used to not being able to simply type every character they need.
1 - http://www.haskell.org/ghc/docs/latest/html/users_guide/syntax-extns.html#un... 2 - http://www.haskell.org/haskellwiki/Unicode-symbols 3 - http://hackage.haskell.org/package/base-unicode-symbols 4 - http://hackage.haskell.org/package/containers-unicode-symbols
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