Re: Origin for Clojure using the term 'vector' instead of 'array'?

[Daniel Barlow]

Common Lisp also has multi dimensional arrays and one - dimensional
vectors.  I believe Rich was pretty familiar with that language in a former
life

http://clhs.lisp.se/Body/t_array.htm
On 3 Oct 2015 15:44, "Erik Price"  wrote:

> I always assumed it was because vectors have similar properties to the
> classic java.util.Vector: they’re variable-length, contain heterogenous
> objects accessible by integer index, and safe for concurrent access from
> multiple threads:
> http://docs.oracle.com/javase/7/docs/api/java/util/Vector.html
>
> e
> ​
>
> On Fri, Oct 2, 2015 at 11:46 PM, Mars0i  wrote:
>
>> I have no idea about the official reason, but outside of certain
>> programming languages that use "array" for one-dimensional data structures,
>> an array often has two (or more) dimensions.  In R, for example, arrays can
>> have an arbitrary number of dimensions.  Honestly, when I'm away from Java
>> for a while and then encounter the term "array" in Java, I have to stop and
>> remember that it's 1-D, or check some documentation, because "array"
>> doesn't automatically mean 1-D to me.
>>
>> On the other hand, I believe that vectors are always one-dimensional, as
>> in linear algebra.
>>
>> So maybe Rich Hickey just decided that "vector" was a better, less
>> ambiguous name.
>>
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Re: Experiencing extremely slow performance on raspberry pi (model b)

[Daniel Barlow]

On 12 May 2014 10:40, C K Kashyap ckkash...@gmail.com wrote:
 I finally got my robotic vehicle working using raspberry pi. I was hoping to
 make it do tricks using the clojure repl - however, I found that repl took
 well over 2 minutes to start. Is that normal or are folks seeing better
 performance?

I haven't tried it on a Pi, but it's consistent with what I see when I
start a lein repl on my android phone (inside a debian chroot using a
regular linux jvm).  One problem you may be seeing is that leiningen
starts a jvm and your app starts a jvm, and in a RAM-limited
environment that means a lot of paging.

What I did is
1) created a namespace myapp.nrepl which calls
(clojure.tools.nrepl.server/start-server :port 9990)

2) invoke the app with

  $ lein trampoline run -m myapp.nrepl

3) connect to it from some other machine

  $ lein repl :connect myphone.local:9990

This means there's only one JVM running at a time on the phone (or in
your case, pi) and reduces the startup time on my phone from something
arounf 2 minutes to something around 40 seconds.  Which is still Too
Long but not quite as Much Too Long

Playing with clojure-metal and clojure-c are both on my TO DO,
EVENTUALLY list but I have more than enough to keep me occupied for
the time being already, so not any time soon

[ With Actual Code!
https://github.com/telent/defone/blob/master/defone/start.sh
https://github.com/telent/defone/blob/master/defone/src/defone/nrepl.clj
]

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Re: clojure.io

[Daniel Barlow]

On Sat, Mar 10, 2012 at 9:41 PM, Brian Goslinga brian.gosli...@gmail.comwrote:

 There is a trade off here. If you want to be very portable you'll end up
 with something like the CL path API because you need logicals and file
 revisions to really support VMS, for example.


In a former life I spent more time than I now care to dwell on in battling
the CL pathname API, both as an implementor (SBCL) and a user (I was the
original author of the ASDF build system).  While I can accept that a
portable pathname system would need to provide support for e.g. logicals
and file revisions, I still claim that CL is in this respect an
extraordinarily rich source of information on how not to do it.  Customary
case, in particular, still makes me want to scream even ten years later

/rant off

-dan

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Re: Best definition of ClojureScript in one sentence

[Daniel Barlow]

On Mon, Feb 27, 2012 at 10:45 AM, Raju Bitter rajubit...@googlemail.comwrote:

 Quotes:
 ClojureScript is a dialect of Clojure that targets JavaScript as a
 deployment platform.

 ClojureScript allows to write code using the Clojure language and
 compile it to Javascript.

 ClojureScript is a new compiler for Clojure that targets JavaScript.


All of these are (AFAIK anyway) entirely true and there's not much to
choose between them.  The ClojureScript compiler compiles the ClojureScript
language (a dialect of Clojure) into Javascript.

This may not be exactly the input you're looking for, but IMO the key
message you probably want to get across is why is this important?.  It's
important because it allows one to create rich web user interfaces by
writing Clojure to be executed client-side in the user's web browser, and
you've left that entirely implicit.  Focus on the benefits, not on the
technology.

-dan

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Re: Best definition of ClojureScript in one sentence

[Daniel Barlow]

I'd suggest that it's a continuum not a dichotomy, but one convenient place
to draw an arbitrary line is whether you think it sane and sensible to use
debugging facilities designed for the target language or whether you view
that as akin to debugging a c program by inspecting the disassembly.

(of course, if your view is that debugging a c program is *per se* not sane
or sensible, that analogy is of course not a good one)
On Feb 27, 2012 6:48 PM, David Nolen dnolen.li...@gmail.com wrote:

 On Mon, Feb 27, 2012 at 1:41 PM, Raju Bitter rajubit...@googlemail.comwrote:

  How about ClojureScript is a little language that compiles into
  JavaScript? ;)
 
 
  Well, ClojureScript is not little the way that CoffeeScript is -
  ClojureScript comes with cljs.core.

 Exactly, ClojureScript has it's own semantics instead of just being
 syntactic sugar.


 Well, CoffeeScript has it own semantics as well - scope, class syntax,
 expression oriented come to mind.

 David

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