I use comp all the time, not only for transducers, but also for digging
into maps:
(map (comp first :pets)
[{:pets [:fluffy]}
{:pets [:spot]}])
=> (:fluffy, :spot)
Partial is also handy when used with a lot of sequence functions
(->> [1 2 3 4 5]
(filter (partial > 3)))
Sure I could write that function as #(< 3 %), but I find that syntax harder
to mentally parse as I have to remember that the body of the #() is a
function context and then I have to look up where the % symbol is. (partial
> 3) is just easier to understand.
Timothy
On Thu, Oct 27, 2016 at 6:12 PM, Mark Engelberg <[email protected]>
wrote:
> On Thu, Oct 27, 2016 at 9:39 AM, Alan Thompson <[email protected]> wrote:
>
>> I almost never use either the `comp` or the `partial` functions. I think
>> it is clearer to either compose the functions like Gary showed, or to use a
>> threading macro (my favorite is the `it->` macro from the Tupelo library
>> <https://github.com/cloojure/tupelo#literate-threading-macro>).
>> Alan
>>
>>
> You need to use comp if you're building a transducer.
>
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