With Maps, there are less pitfalls. For example: what if you want to use your
version to count words and one of the words is `__proto__`? Most pitfalls can
be fixed via `Object.create(null)`, but Maps are more straightforward for data
(vs. code).
But your version can be easily adapted to Maps, I like the way you use
`reduce()`. The `|` should be a `||`.
> On 28 Apr 2015, at 14:31 , Andrea Giammarchi <andrea.giammar...@gmail.com>
> wrote:
>
> Not sure why everyone went for the `Map` version when in JS every object is
> basically the equivalent of a `Map` already :-)
>
> ```js
> let m = Array.from("mainn").reduce((m,k) => ((m[k] = 1 + (m[k] | 0)), m), {});
> ```
>
> looks a win to me, if you need to check or drop chars from the string I would
> probably do it once before passing that to `Array.from`
>
> Agreed with Kevin this is rather a StackOverflow like question :-)
>
> Best Regards
>
>
> On Tue, Apr 28, 2015 at 1:19 PM, Kevin Smith <zenpars...@gmail.com
> <mailto:zenpars...@gmail.com>> wrote:
> Another option:
>
> var map = new Map;
> Array.from("mainn")
> .map(c => c.toLowerCase())
> .forEach(c => map.set(c, (map.get(c) | 0) + 1));
>
> This kind of question is probably better left for StackOverflow, however.
>
>
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>
--
Dr. Axel Rauschmayer
a...@rauschma.de
rauschma.de
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