Not a rational for why there's no partition transducer in core but I have a
partition transducer in this lib (https://github.com/cgrand/xforms).
=> (sequence (x/partition 3) (range 8))
([0 1 2] [3 4 5])
=> (sequence (x/partition 3 2) (range 8))
([0 1 2] [2 3 4] [4 5 6])
=> (sequence (x/partition 3 2 "padding") (range 8))
([0 1 2] [2 3 4] [4 5 6] [6 7 \p])
Additionally when the last argument is a function it's considered to be a
transducer for each partition.
=> (sequence (x/partition 3 (x/reduce +)) (range 8))
(3 12)
And you can get fancy:
=> (sequence (x/partition 3 (x/transjuxt {:sum (x/reduce +)
:avg (x/reduce x/avg)
:items (x/into [])})) (range 8))
({:sum 3, :avg 1, :items [0 1 2]} {:sum 12, :avg 4, :items [3 4 5]})
On Wed, Oct 12, 2016 at 6:14 AM, Mars0i <marsh...@logical.net> wrote:
> partition-all has a transducer variant, but partition doesn't. Just
> curious why.
>
> The difference between the non-transducer functionalities is that, for
> example, (partition-all n coll) will return shorter-than-n stub sequences
> at the end of the main output sequence if the (count coll) isn't divisible
> by n, while partition will simply stop ignore leave the short sequences out
> of the main sequence (unless you use the four-argument syntax, in which an
> extra argument is used to construct extra sequences at the end of the main
> sequence as needed to use up the input sequence).
>
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