Re: [elixir-core:6407] [Proposal] List.unwrap/1

[Peter Hamilton]

How is its implementation more than just Enum.map(list, /1) ?

I imagine we only conditionally apply hd if it's an element is a list of
length 1. Does it do anything else?
On Sun, Sep 25, 2016, 7:12 PM Chris Keele  wrote:

> I can see how List.unwrap is a confusing–it does sound like the
> mathematical opposite.
>
> Perhaps List.strip/1 is a more intuitive name?
>
>
>
> --
> Chris Keele
> Web Developer
>
> On September 25, 2016 at 6:55:11 PM, Peter Hamilton (
> peterghamil...@gmail.com) wrote:
>
> Is [1,2] valid output of List.wrap? If it's not in the range of output, I
> think we could error on it as input to List.unwrap.
>
> Exactly once might be correct semantics, will have to play with some
> examples.
>
> On Sun, Sep 25, 2016, 3:46 PM Chris Keele  wrote:
>
>> If List.unwrap([1]) = 1, how would you handle List.unwrap([1, 2])? [1, 2]
>> would be inconsistent. That’s more of a splat/unquote_splicing operation.
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Re: [elixir-core:6406] [Proposal] List.unwrap/1

[Chris Keele]

I can see how List.unwrap is a confusing–it does sound like the
mathematical opposite.

Perhaps List.strip/1 is a more intuitive name?



-- 
Chris Keele
Web Developer

On September 25, 2016 at 6:55:11 PM, Peter Hamilton (
peterghamil...@gmail.com) wrote:

Is [1,2] valid output of List.wrap? If it's not in the range of output, I
think we could error on it as input to List.unwrap.

Exactly once might be correct semantics, will have to play with some
examples.

On Sun, Sep 25, 2016, 3:46 PM Chris Keele  wrote:

> If List.unwrap([1]) = 1, how would you handle List.unwrap([1, 2])? [1, 2]
> would be inconsistent. That’s more of a splat/unquote_splicing operation.
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Re: [elixir-core:6405] [Proposal] List.unwrap/1

[Peter Hamilton]

Is [1,2] valid output of List.wrap? If it's not in the range of output, I
think we could error on it as input to List.unwrap.

Exactly once might be correct semantics, will have to play with some
examples.

On Sun, Sep 25, 2016, 3:46 PM Chris Keele  wrote:

> If List.unwrap([1]) = 1, how would you handle List.unwrap([1, 2])? [1, 2]
> would be inconsistent. That’s more of a splat/unquote_splicing operation.
>
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Re: [elixir-core:6404] [Proposal] List.unwrap/1

[Chris Keele]

If List.unwrap([1]) = 1, how would you handle List.unwrap([1, 2])? [1, 2]
would be inconsistent. That’s more of a splat/unquote_splicing operation.

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Re: [elixir-core:6403] [Proposal] List.unwrap/1

[Peter Hamilton]

> List.unwrap ensures its arguments are wrapped in a list only once.

Only once or at most once?

I think it should be a strict mathematical inverse so:

(List.wrap(foo) |> List.unwrap) == foo

On Sun, Sep 25, 2016, 3:17 PM Chris Keele  wrote:

> Simply put, if List.wrap ensures its arguments are wrapped in a list at
> least once, List.unwrap ensures its arguments are wrapped in a list only
> once.
>
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Re: [elixir-core:6403] [Proposal] List.unwrap/1

[Chris Keele]

Simply put, if List.wrap ensures its arguments are wrapped in a list at 
least once, List.unwrap ensures its arguments are wrapped in a list only 
once.

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Re: [elixir-core:6401] [Proposal] List.unwrap/1

[Chris Keele]

It respects the existence of lists as a general data structure––effectively
only flattening wrapper lists.

nested = [ [], :a, [:b], [[:c]] ]
List.flatten nested
#=> [:a, :b, :c]
List.unwrap nested
#=> [ [], :a, [:b], [:c] ]

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Re: [elixir-core:6400] [Proposal] List.unwrap/1

[Louis Pilfold]

What's the difference between this and List.flatten ?

Cheers,
Louis

On 25 Sep 2016 23:00, "Chris Keele"  wrote:

> List.unwrap/1
> 
> is a simple compliment to List.wrap/1––it walks a nested list and unwraps
> any extraneous wrappers it finds, eg: [[:a]] -> [:a].
>
> I mostly find it useful for cleaning up after nested list transforms, but
> always manage to implement it wrong the first few times, so I thought I'd
> throw it out there as a general list utility.
>
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[elixir-core:6400] [Proposal] List.unwrap/1

[Chris Keele]

List.unwrap/1 

 
is a simple compliment to List.wrap/1––it walks a nested list and unwraps 
any extraneous wrappers it finds, eg: [[:a]] -> [:a].

I mostly find it useful for cleaning up after nested list transforms, but 
always manage to implement it wrong the first few times, so I thought I'd 
throw it out there as a general list utility.

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