Re: [elm-discuss] Re: Pattern matching using existing bound variables

[Max Goldstein]

That's exactly Maybe.withDefault "something", which is a great example of 
partial application. 

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Re: [elm-discuss] Re: Pattern matching using existing bound variables

[Duane Johnson]

Ah, that makes sense. Take the value out of the Maybe box.

On Dec 5, 2016 2:32 PM, "David Andrews"  wrote:

> That is what I meant.  I will often use this pattern as follows:
>
> orSomething : Maybe String -> String
> orSomething str =
>   case str of
> Just str -> str
> Nothing -> "something"
>
> I realize, though, that I misunderstood the original question.
>
> On Monday, December 5, 2016 at 3:25:07 PM UTC-5, Duane Johnson wrote:
>>
>>
>> On Sun, Dec 4, 2016 at 6:53 PM, David Andrews  wrote:
>>
>>> I expect that you are actually looking to do something like this:
>>>   let
>>> x = 1
>>>   in
>>> case something of
>>>   Just x -> ...
>>>   Nothing -> ...
>>>
>>
>> David, are you sure you didn't mean the following?
>>
>> case something of
>>
>>Just 1 -> ...
>>
>>Nothing -> ...
>>
>>
>> It seems strange to include a shadowed variable `x` as in your expected
>> code.
>>
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Re: [elm-discuss] Re: Pattern matching using existing bound variables

[David Andrews]

That is what I meant.  I will often use this pattern as follows:

orSomething : Maybe String -> String
orSomething str =
  case str of
Just str -> str
Nothing -> "something"

I realize, though, that I misunderstood the original question.  

On Monday, December 5, 2016 at 3:25:07 PM UTC-5, Duane Johnson wrote:
>
>
> On Sun, Dec 4, 2016 at 6:53 PM, David Andrews  > wrote:
>
>> I expect that you are actually looking to do something like this:
>>   let
>> x = 1
>>   in
>> case something of
>>   Just x -> ...
>>   Nothing -> ...
>>
>
> David, are you sure you didn't mean the following?
>
> case something of
>
>Just 1 -> ... 
>
>Nothing -> ...
>
>
> It seems strange to include a shadowed variable `x` as in your expected 
> code.
>

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Re: [elm-discuss] Re: Pattern matching using existing bound variables

[Duane Johnson]

On Sun, Dec 4, 2016 at 6:53 PM, David Andrews  wrote:

> I expect that you are actually looking to do something like this:
>   let
> x = 1
>   in
> case something of
>   Just x -> ...
>   Nothing -> ...
>

David, are you sure you didn't mean the following?

case something of

   Just 1 -> ...

   Nothing -> ...


It seems strange to include a shadowed variable `x` as in your expected
code.

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