One of the things that I find unusual with clojure is the requirement
for forward declaration. While I can see the advantages, managing it by
hand can be a pain.
So I was wondering, are there any tools for adding declare statements
when necessary. And better for working out how to reorder functi
marți, 13 august 2013, 23:13:39 UTC+3, Russell Whitaker a scris:
>
> Speaking of "the purpose of the poll," what is it? What purpose does an
> off-list
> poll serve that an on-list answer doesn't? I'm curious: is this for a
> school assignment
> or for an employer or...?
>
> R
>
>
Statistics
Hi!
Thanks for your answer Sean I got it solved using clj-time
Also I found the problem with my macro attempt
user> (defmacro is
[s instant]
`(= (.get ~instant Calendar/DAY_OF_WEEK)
(. Calendar ~s)))
#'current-day.core/is
user> (is FRIDAY (Calendar/getInstance))
false
why on earth is this a macro and not a regular fn?
Jim
On 14/08/13 16:19, Daniel Meneses wrote:
Hi!
Thanks for your answer Sean I got it solved using clj-time
Also I found the problem with my macro attempt
user> (defmacro is
[s instant]
`(= (.get ~instant Calendar/DAY_OF_WEE
I don't know if you have a differente approach, but as a defn it doesn't
work
user> (import '[java.util Calendar])
java.util.Calendar
user> (defn is [s instant]
(= (.get instant Calendar/DAY_OF_WEEK)
(. Calendar s)))
CompilerException java.lang.NoSuchFieldException: s,
compiling
Răzvan Rotaru writes:
> Statistics. I want to know how many Clojure users actually like the syntax
> and find it beautiful, and how many just go along with it, with it's good
> and bad. No school or employer assignment.
> I am surprised and happy that so many have expressed their opinion on this
Two obviously. It's the only compromise between those who want everything
to be a prime number, and those who want everything to be a power of two.
On 14 August 2013 18:48, Phillip Lord wrote:
> Răzvan Rotaru writes:
> > Statistics. I want to know how many Clojure users actually like the
> syn
I know you said clj-time solved this for you, but here's another way to
handle it which avoids using a macro (using a map of keywords to
java.util.Calendar weekday enums for convenience and to be more
Clojure-esque, but it isn't necessary):
user=> (def weekdays {:mon Calendar/MONDAY :tues Calendar
And if you're a JavaScript developer with an extreme mind, you minimize
your code to have no space.
Le 14 août 2013 18:12, "Dan Cross" a écrit :
> On Wed, Aug 14, 2013 at 12:08 PM, Chris Ford
> wrote:
>
>> Two obviously. It's the only compromise between those who want everything
>> to be a prime
On Wed, Aug 14, 2013 at 12:08 PM, Chris Ford wrote:
> Two obviously. It's the only compromise between those who want everything
> to be a prime number, and those who want everything to be a power of two.
>
I used to sometimes use 3 spaces, just to be a contrarian. Then I learned
the error of my
m... the function you wrote only returns true on saturdays
but I get the point!
thanks for your answer
On Wed, Aug 14, 2013 at 12:14 PM, Dave Della Costa wrote:
> I know you said clj-time solved this for you, but here's another way to
> handle it which avoids using a macro (using a map of keyw
On 14/08/13 16:45, Daniel Meneses Báez wrote:
(defn is [s instant]
(= (.get instant Calendar/DAY_OF_WEEK)
(. Calendar s)))
(def ^:private day->int
{:MONDAY 2 :TUESDAY 3 :WEDNESDAY 4 :THURSDAY 5 :FRIDAY 6 :SATURDAY 7
:SUNDAY 1})
(defn is-today?
([s instant]
(= (.get inst
Ahhh, the good old Lisp syntax debate!
I learned Clojure back in 2008, and it was my first Lisp (and is still the
only Lisp I'm comfortable with).
I've had lots of Java experience, and a fair amount of Ruby experience over
the years... With occasional bits and pieces in other languages like
Erlan
and the non-reflective version which also fixes the typos and the
inefficient transform from keyword -> symbol.
(def ^:private day->int
{:MONDAY 2 :TUESDAY 3 :WEDNESDAY 4 :THURSDAY 5 :FRIDAY 6 :SATURDAY 7
:SUNDAY 1})
(defn is-today?
([s ^java.util.GregorianCalendar instant]
(= (.get instant
Sorry, somehow I got the wrong line pasted in there! Should be:
user=> (defn is-day-of-week? [day-enum] (= (.get (Calendar/getInstance)
Calendar/DAY_OF_WEEK) (day-enum weekdays)))
...but you probably figured that out. ;-)
DD
(2013/08/14 12:43), Daniel Meneses Báez wrote:
> m... the function y
Is this a bug?
user> (with-redefs [list +] (list 1 2)) ;; expected: 3
3 ;; huzzah
user> (with-redefs [+ list] (+ 1 2)) ;; expected: (1 2)
3 ;; blast!
--
Ben Wolfson
"Human kind has used its intelligence to vary the flavour of drinks, which
may be sweet, aromatic, fermented or spirit-based. ..
No; functions with :inline-* metadata (go look at the source for +, for
example) are...inlined, thus eliminating var lookups, and any effect of
binding, with-redefs, etc. The workaround for this is to call through
the var:
user=> (with-redefs [+ list] (#'+ 1 2))
(1 2)
Cheers,
- Chas
On 08/
So I'm new to Clojure, and have been working through how to make Clojure
code performant (i.e. what approaches are faster than others, how to
profile, etc) by writing a (embarrassingly) simple ray-tracer.
In a ray tracer there is a tight loop that runs per pixel, where you
determine which of a
On Wednesday, August 14, 2013 10:14:24 AM UTC-7, Rick Moynihan wrote:
> Subjectively I found Erlang's syntax pretty horrible (though I like the
> language itself), Ruby's is superficially beautiful but in practice
> ambiguous and not without its warts...
>
Have you had a chance to check out Eli
Thanks!
On Tuesday, August 13, 2013 12:18:33 PM UTC-7, Norman Richards wrote:
>
>
>
>
> On Mon, Aug 12, 2013 at 4:03 PM, Mark >wrote:
>
>>
>> At run level 6, I get all the permutations of [1 2 3], just as expected.
>> However, at 7, the program does not terminate and I'd like to understand
>
Hello. I've coded quite a lot of JDBC usage in Java, and enough Clojure to
know my way around pretty well; yet I've been unable to figure out the
following by reading the source and docs for clojure.java.jdbc. I've read
http://clojure.github.io/java.jdbc/ and many pages linked from there.
The q
I think you can use db-connection, something like:
(let [conn (db-connection spec)
meta (.getMetaData conn)]
(doall (.getTables meta nil "schema" "%s" nil))
(.close conn))
Or what have you. I wrote a little macro `with-meta-data` that was something
like that, with added try/ca
Does db-transaction work in your case?
"Evaluates body in the context of a transaction on the specified database
connection.
The binding provides the database connection for the transaction and the name
to which
that is bound for evaluation of the body.
See db-transaction* for more details."
G
The `db-spec` can have a `:connection` member and all operations will
use that. You are responsible for closing it when you're done.
Something like (untested, off the top of my head):
(with-open [conn (get-connection db-spec)]
(let [db (assoc db-spec :connection conn)]
...
(query db ...)
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