Thanks - useful idioms to know about!
On Friday, 18 July 2014 16:18:33 UTC+9:30, puzzler wrote:
>
> Yeah, you've answered your own question. In practice, I doubt the
> difference is measurable.
>
> Another common idiom you see in Clojure code is:
> (defn f [xs]
> (if-let [s (seq xs)]
> ...
=> (empty [:foo 5])
[]
=> (first (mapv identity {:foo 5}))
[:foo 5]
=> (empty (first (mapv identity {:foo 5})))
nil
What just happened there? Is this expected? In the second and third cases
the type of the vector is clojure.lang.MapEntry, which I expect is the root
of the behavior, but this seem
On Jul 18, 2014, at 5:45 AM, Brian Craft wrote:
> => (empty [:foo 5])
> []
> => (first (mapv identity {:foo 5}))
> [:foo 5]
> => (empty (first (mapv identity {:foo 5})))
> nil
=> (class (first (mapv identity {:foo 5})))
clojure.lang.MapEntry
=> (class (first (mapv (fn [[k v]] [k v]) {:foo 5})))
My guess: Perhaps this is a bug, or alternatively, a known issue that won't
be addressed because to do so would be a breaking change.
There is an old demo of Clojure given by Rich where MapEntry's were printed
using some sort of un-readable notation #<:foo 5>. But clearly MapEntry's
have been r
While MapEntry is displayed as a vector it isn't actually a collection
(which is a mistake I sometimes make also), so empty behaves as expected.
On Friday, 18 July 2014 10:45:19 UTC+1, Brian Craft wrote:
>
> => (empty [:foo 5])
> []
> => (first (mapv identity {:foo 5}))
> [:foo 5]
> => (empty (fi
On Thursday, July 17, 2014 8:49:12 AM UTC-4, empt...@gmail.com wrote:
>
> Hi,
>
> I have a list of epoch times which map to HTTP requests.
>
> '(1405060202611
> 1405060201157
> 1405060201361
> 1405060201261
> 1405060200391
> 1405060201458
> 1405060201705
> 1405060201058
> 1405060205062
> 14050602
You could use frequencies:
user=> (frequencies (map #(quot % 1000) epochs))
{1405060202 1, 1405060201 8, 1405060200 1, 1405060205 1}
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Note t
We are trying to include a serial port handler package in our project.
We tried to use the rxtx22 1.0.6 clojar... this works on laptops but not on
the smaller computer with an ARM processor.
we tried following the instructions here: (except we are using the
localrepo plugin for lein to manage
Hi,
AFAIK RXTX is obsolete, you may have more luck with JSSC [1]. Including it
in your Clojure project is easy, just add [org.scream3r/jssc "2.8.0"]
While it's not perfect, its pretty solid from my experience. There is a
support for ARM, but I've been using it only in x86-64 Linux.
[1] https://g
hm, looks even more broken in the context of these examples.
On Friday, July 18, 2014 5:04:34 AM UTC-7, Mike Fikes wrote:
>
> My guess: Perhaps this is a bug, or alternatively, a known issue that
> won't be addressed because to do so would be a breaking change.
>
> There is an old demo of Clojure
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