Something like the following would be fine for me
(def cache (atom {}))
(defn lookup [cache k]
(let [v (get @cache k ::nil)]
(if (= v ::nil)
(let [v (calc-value k)]
(swap! cache assoc k v)
v)
v)))
(let [value (lookup cache k)]
; use value and @cache here
)
Hi all,
I want to use a map to cache values based on a key. I'm planning to use an
atom for this. My basic operation is "give me the value for this key" - if
the value exists in the map then that value should be returned, otherwise a
new value should be calculated, inserted in the map and then ret
Obviously I can't.
But I need to add this capability to an object. During testing I attach
meta to this object that contains an atom. Then I pass this object to other
functions, known in runtime. I can't use a dynamic var because all this
happens within a mock function that may be retried and run
On Fri, Aug 29, 2014 at 3:04 PM, Ashton Kemerling wrote:
> Bar/baz refers to the symbol baz in the namespace bar. If you haven't
> created and imported bar, that's an error.
>
>
Ashoton's correct. So you'd expect something like this, before being able
to e=compile your code.
*a/bar.clj*
(ns a.b
On Fri, 29 Aug 2014, Sam Raker wrote:
> I'm just not sure what to do at this point in my Clojure learning
> experience. I've probably written a few thousand lines of Clojure at this
> point, but I'm not sure that I'm doing things "right:" I don't know if my
> code is efficient, or even idiomati
I worked my way through *Clojure Programming* (Emerick, Carper, & Grand,
O'Reilly), and I've started writing my own Clojure (porting over an
unfinished Python project that seemed amenable to the Clojure treatment.) I
really love the language, but I'm not sure where to go from here.
My other ma
(Rich Hickey is the only one who could answer finally but...)
I think this information is old and outdated, streams didn't really make it
into clojure.
The things that survived was the *sequence* abstraction (which is used
almost everywhere), later the *reducers* (facilitating javas fork-join
con
Bar/baz refers to the symbol baz in the namespace bar. If you haven't created
and imported bar, that's an error.
On Fri, Aug 29, 2014 at 11:56 AM, Sreeharsha Mudivarti
wrote:
> (defn foo[]
> (println bar/baz))
> (defn car[]
> (println 42))
> ---
> java -cp ~/clojure/clojure-1.6.0.jar cloj
Hi Everyone,
Does anyone know the status of clojure streams is? I would like to try them
out but I can't find the svn repository mentioned on the website:
http://clojure.org/streams. Thx!
-Greg
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To po
Awesome! Thanks Andy. I'll make a point of getting this in to Grimoire
0.3.6.
Reid
On 08/29/2014 08:56 AM, Andy Fingerhut wrote:
> Newest version available here:
>
> http://jafingerhut.github.io
>
> Updates will likely make their way to the Grimoire and Clojure.org
> cheatsheet pages in time.
(defn foo[]
(println bar/baz))
(defn car[]
(println 42))
---
java -cp ~/clojure/clojure-1.6.0.jar clojure.main foo.clj
Exception in thread "main" java.lang.RuntimeException: No such namespace:
bar, compiling:(/Users/harsha/foobar/foo.clj:2:3)
...
In Ruby and Python, the compiler is s
Hello,
Is it possible to change the default clojure reader to use
clojure.tools.reader.reader-types/source-logging-push-back-reader?
I am currently using this reader so that I can see the source code of my
fns at runtime as metadata, however, it requires that I read the source
again once the p
Great! Thanks a lot!
Il giorno venerdì 29 agosto 2014 16:52:49 UTC+2, Ivan L ha scritto:
>
> Dan apparently is really strapped on time. If you check out the issues
> list you'll see a few of us are using a fork from github/@whoops while he's
> out and whoops has updated to the latest react.
>
>
Dan apparently is really strapped on time. If you check out the issues
list you'll see a few of us are using a fork from github/@whoops while he's
out and whoops has updated to the latest react.
On Friday, August 29, 2014 7:21:46 AM UTC-4, Cesare wrote:
>
> Hi Dan,
> I'm playing with Reagent an
Newest version available here:
http://jafingerhut.github.io
Updates will likely make their way to the Grimoire and Clojure.org
cheatsheet pages in time.
I was reviewing the sections of the cheatsheet on Sets and Maps, and grew
dissatisfied with the placement of some of the functions. I adde
Thanks: works perfectly.
The minimum html is (more or less):
https://netdna.bootstrapcdn.com/bootstrap/3.1.1/css/bootstrap.min.css";
rel="stylesheet" type="text/css" class="style" />
http://fb.me/react-0.11.1.js";>
goog.requ
Hi Dan,
I'm playing with Reagent and I find it very simple and promising. Thanks
for it!
Anyway, the last update was 5 months ago (react 0.10.0): is the project
still alive and well?
Thanks in advance!
Il giorno sabato 22 febbraio 2014 09:11:42 UTC+1, Dan Holmsand ha scritto:
>
> Reagent is no
Hello Everyone!
The Call for Presentations for The Clojure eXchange 2014 in London on
Thursday, 4th - Friday, 5th December is open.
The form to submit proposals is here:
https://docs.google.com/forms/d/1yBO0URvt6Zby0AWBp0xeBYna04JfaVUBsmGVbP5wHLc/viewform
The conference registration page is her
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