[Haskell-cafe] naming convention for maybes?

[Evgeny Tarasov]

I do it in a similar way, not just for maybes:

paramMay <- getHTTPPostParam "Param"
paramStr <- maybe (throwError "No Param parameter") return paramMay
let paramE = parseParam paramStr
param <- case paramE of
Left e -> throwError $ "Error while parsing Param: " ++ show e
Right p -> return p

It'd be great, if there was a "centralised" naming convention guide.

22.04.2011 23:21, Matthew Steele пишет:
> In my own code, I usually use a 'mb' prefix with camelCase, like so:
>
> case mbStr of
> Just str -> ...
> Nothing -> ...
>
> But I agree that it doesn't always look very nice. I'm curious what 
> others do.
>
> On Apr 22, 2011, at 1:14 PM, Evan Laforge wrote:
>
>> Here's a simple issue that's been with me for a while. As do many
>> people, I use plural variable names for lists, so if a Block as called
>> 'block' then [Block] is 'blocks'.
>>
>> The other pattern that comes up a lot is 'Maybe Block'. When I have
>> to name it, I call it 'maybe_block', e.g.
>>
>> maybe_block <- lookup something
>> case maybe_block of
>> Just block -> ...
>>
>> However, this maybe_ prefix is rather long and unwieldy. I have
>> considered things like 'm' or 'mb' but they don't suggest Maybe to me.
>> An 'm' prefix or suffix is already implying 'monad'. If '?' were
>> allowed in identifiers I could use it as a suffix. I could just
>> append 'q' and get used to it... lispers did it with 'p' after all. I
>> suppose 'mby' could be ok, but for some reason it just looks ugly to
>> me. 'opt' looks ok, I suppose, but 'optional' doesn't cover the full
>> range of Maybe's usage (i.e. it's strange to call a failed lookup
>> result "optional"). Does anyone else have a nice convention for this?
>> Hopefully something short but intuitive and nicely reading like the
>> plural convention?
>>
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>
>
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