Ok. Well, at least your solution can provide documentation for this :)
On Tuesday, May 3, 2016 at 2:00:57 PM UTC+7, David Whitlock wrote:
>
> Hi all,
>
> In many languages, there is a multiset functionality (in Python, this is
> called Counter), which produces a map with the counts of each item from a
> list. For example, you might want to do a word search of a text stream, and
> after converting the text to a list of words, you can then call the
> multiset / counter function and it would produce something like this:
>
> %{"the" => 34, "cat" => 2, "mat" => 7}
>
> I've found this functionality very useful in the past, and I was wondering
> if it might be added to the standard library.
>
> My proposal is to add something like the following function to the Enum
> module:
>
> def counter(items) do
> Enum.reduce items, %{}, fn key, map ->
> current = case :maps.find(key, map) do
> {:ok, value} -> value
> :error -> 0
> end
> :maps.put(key, current + 1, map)
> end
> end
>
> This would take any list and return a map containing the 'counts' of each
> item. I don't see the need for creating a separate multiset type. It can
> just be used like any other map.
>
> Please let me know what you think,
> David
>
--
You received this message because you are subscribed to the Google Groups
"elixir-lang-core" group.
To unsubscribe from this group and stop receiving emails from it, send an email
to [email protected].
To view this discussion on the web visit
https://groups.google.com/d/msgid/elixir-lang-core/1a1b7bad-2b1b-4cb1-bee7-80d194cf438c%40googlegroups.com.
For more options, visit https://groups.google.com/d/optout.
