I think that even if it enabled awesome optimization opportunities,
1. Having both *Enum.index_with* and *Enum.index*/*indexed* will confuse
people.
2. Straying from Elixir's consistent API design of "Module X functions take
X's as their first argument" will confuse people.
a. Especially in the very consistent and large-surface-area *Enum* module.
Both together seem like a less-than-ideal combination. These trade-offs may
be worth it depending on what is gained, though.
I hadn't seen the second point mentioned yet in this thread yet. Which
makes me wonder if there is a *different* module it might belong under,
instead, resolving both problems while preserving the intention-revealing
*index* function name?
ie: *Integer.index(start \\ 0 :: non_neg_integer, Enum.t) :: Enum.t*
Kind of communicates that we are indexing an enumerable by an integer
value; and just appears a little non-standard when we omit the starting
point.
Creating a new module namespace for such a function to live--ex *Index*--seems
a little excessive in this case, a costly increase in the surface of the
standard library. (Is *Enum.Index.by/2* unreasonable? Probably.)
Worth nothing that these sorts of one-off-function discussions are exactly
how some modules we have today came into being, though--*Atom* and *Tuple* come
to mind. But "indexes" are hardly first-class language concepts.
On Tuesday, December 8, 2020 at 2:02:13 PM UTC-8 br...@grox.io wrote:
> There is a bit of a collision with the option for the offset, but you
> could pattern match that.
>
> -bt
>
> On Tue, Dec 8, 2020 at 4:57 PM Zach Daniel <zachary....@gmail.com> wrote:
>
>> I like that idea a lot Bruce. Let’s you do something like:
>>
>> maps |> Enum.with_index(&Map.put(&1, :index, &2))
>>
>> On Tue, Dec 8, 2020 at 4:50 PM Bruce Tate <br...@grox.io> wrote:
>>
>>> Maybe a transform function on with_index?
>>>
>>> Enum.with_index([:a, :b, :c], &{&2, &1})
>>>
>>> -bt
>>>
>>> On Tue, Dec 8, 2020 at 3:05 PM José Valim <jose....@dashbit.co> wrote:
>>>
>>>> I would like to propose an Enum.index/2 function. It behaves like
>>>> with_index/2 but the index is the first argument:
>>>>
>>>> iex> Enum.index([:a, :b, :c])
>>>> [{0, :a}, {1, :b}, {2, :c}]
>>>>
>>>> I am hoping it reads "index" this tuple (hence the index as the first
>>>> element. While with_index means attach an index information to each
>>>> element
>>>> (hence the second element). Is this sound?
>>>>
>>>> Thank you,
>>>>
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