The main use case for the non-boolean aspect of `some` is when you use it
to find the first element of a sequence that is in a particular set.
(some #{....} [....])
The idea is that when you get a "hit", the return value is the specific
element of the *set* that matched. This is a useful trick for turning
values into something canonical that can be compared with your canonical
values using identical?
=> (def a (with-meta [1 2] {:canonical true}))
=> (some #{a} [(list 1 2)])
[1 2]
=> (meta (some #{a} [(list 1 2)]))
{:canonical true}
=> (identical? a (some #{a} [(list 1 2)]))
true
On Sun, Apr 26, 2015 at 12:02 AM, Isaac Zeng <ndtm.i...@gmail.com> wrote:
> some
>
>
> On Sunday, April 26, 2015 at 9:32:09 AM UTC+8, Colin Taylor wrote:
>>
>> Any reason why we don't have `any?`. Googled without much luck.
>> Trivially done as `comp boolean some` not doubt, but I know I use it more
>> than not-any at least.
>> It's particularly useful as a composable `or`.
>>
>>
>> --
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