Re: DUB dependency issue

[Andrew Edwards via Digitalmars-d-learn]

On Wednesday, 4 October 2017 at 01:59:48 UTC, Andrew Edwards 
wrote:

Attempting to use iopipe but not sure what I'm doing incorrectly



Finally figured it out. For some reason, the init find the local 
dependency to load but simply adding it to the dub.json afterward 
resolves the issue.

Re: Vibe.d using Windows Certificate binding, possible?

[rikki cattermole via Digitalmars-d-learn]

On 04/10/2017 3:54 AM, Jesse Phillips wrote:

On Tuesday, 3 October 2017 at 23:29:49 UTC, rikki cattermole wrote:

On 03/10/2017 4:52 PM, Jesse Phillips wrote:
I'm pretty sure this isn't possible, but maybe someone understands 
Windows better.


Windows provides a means no bind a certificate to a port using 
netsh.exe. This means (at least for standard Windows networking 
calls) connections to that port will be given the bound cert.


The Vibe.d documents state that a Certificate chain and key needs to 
be provided. I'm pretty sure that the port binding requires very 
specific Network API calls, possible .NET only. Can any confirm or deny?


Perhaps you could reference the command (aka the args with an example)?
Otherwise, its a lot harder to figure out what it is doing under the 
hood.


Here is the command docs

https://msdn.microsoft.com/en-us/library/windows/desktop/cc307220(v=vs.85).aspx 



"Application program source files include the Http.h header file to 
access function prototypes and structure definitions for the HTTP Server 
API. Developers can use the Httpapi.lib library file to build 
applications that use the HTTP Server API. At runtime, applications link 
to the Httpapi.dll."


So no, vibe.d can't work with it. This a special snow flake feature from 
2k3 server days.

Re: Vibe.d using Windows Certificate binding, possible?

[Jesse Phillips via Digitalmars-d-learn]

On Tuesday, 3 October 2017 at 23:29:49 UTC, rikki cattermole 
wrote:

On 03/10/2017 4:52 PM, Jesse Phillips wrote:
I'm pretty sure this isn't possible, but maybe someone 
understands Windows better.


Windows provides a means no bind a certificate to a port using 
netsh.exe. This means (at least for standard Windows 
networking calls) connections to that port will be given the 
bound cert.


The Vibe.d documents state that a Certificate chain and key 
needs to be provided. I'm pretty sure that the port binding 
requires very specific Network API calls, possible .NET only. 
Can any confirm or deny?


Perhaps you could reference the command (aka the args with an 
example)?
Otherwise, its a lot harder to figure out what it is doing 
under the hood.


Here is the command docs

https://msdn.microsoft.com/en-us/library/windows/desktop/cc307220(v=vs.85).aspx

Re: Should this Compile?

[SamwiseFilmore via Digitalmars-d-learn]

On Tuesday, 3 October 2017 at 23:13:00 UTC, Jonathan M Davis 
wrote:
On Tuesday, October 03, 2017 22:42:35 SamwiseFilmore via 
Digitalmars-d-learn wrote:
On Tuesday, 3 October 2017 at 22:37:17 UTC, SamwiseFilmore 
wrote:
> Am I using the ternary operator correctly here, or is this 
> an issue with dmd? I'm using dmd v2.076.0.


I wrapped the ternary in parentheses, and it compiled. Still, 
I'm wondering about this behavior.


Operator precedence makes it quite clear how the ternary 
operator is supposed to function, and if you're ever not sure, 
then put parens around it.


https://wiki.dlang.org/Operator_precedence

- Jonathan M Davis


Thanks, that clears things up. I appreciate it!

DUB dependency issue

[Andrew Edwards via Digitalmars-d-learn]

Attempting to use iopipe but not sure what I'm doing incorrectly

I've cloned the repository in /Users/edwarac/git.repo.dir/ then 
added the path to dub:

edwarac-pc:.dub edwarac$ dub add-path /Users/edwarac/git.repo.dir
edwarac-pc:.dub edwarac$ dub list
Packages present in the system and known to dub:
  iopipe ~master: /Users/edwarac/git.repo.dir/iopipe/
  iopipe:byline ~master: /Users/edwarac/git.repo.dir/iopipe/
  iopipe:convert ~master: /Users/edwarac/git.repo.dir/iopipe/
  iopipe:unzip ~master: /Users/edwarac/git.repo.dir/iopipe/
  iopipe:zip ~master: /Users/edwarac/git.repo.dir/iopipe/

Now I'm trying to init a project with iopipe as a dependency but 
am receiving the following error:


Package recipe format (sdl/json) [json]:
Name [syosetsu]:
Description [A minimal D application.]:
Author name [edwarac]:
License [proprietary]:
Copyright string [Copyright © 2017, edwarac]:
Add dependency (leave empty to skip) []: requests
Added dependency requests ~>0.5.3
Add dependency (leave empty to skip) []: iopipe
Could not find package 'iopipe'.

Re: Vibe.d using Windows Certificate binding, possible?

[rikki cattermole via Digitalmars-d-learn]

On 03/10/2017 4:52 PM, Jesse Phillips wrote:
I'm pretty sure this isn't possible, but maybe someone understands 
Windows better.


Windows provides a means no bind a certificate to a port using 
netsh.exe. This means (at least for standard Windows networking calls) 
connections to that port will be given the bound cert.


The Vibe.d documents state that a Certificate chain and key needs to be 
provided. I'm pretty sure that the port binding requires very specific 
Network API calls, possible .NET only. Can any confirm or deny?


Perhaps you could reference the command (aka the args with an example)?
Otherwise, its a lot harder to figure out what it is doing under the hood.

Re: Should this Compile?

[Jonathan M Davis via Digitalmars-d-learn]

On Tuesday, October 03, 2017 22:42:35 SamwiseFilmore via Digitalmars-d-learn 
wrote:
> On Tuesday, 3 October 2017 at 22:37:17 UTC, SamwiseFilmore wrote:
> > Am I using the ternary operator correctly here, or is this an
> > issue with dmd? I'm using dmd v2.076.0.
>
> I wrapped the ternary in parentheses, and it compiled. Still, I'm
> wondering about this behavior.

Operator precedence makes it quite clear how the ternary operator is
supposed to function, and if you're ever not sure, then put parens around
it.

Almost every operator has higher precedence than the ternary operator, so
aside from simple assignments, you typically have to use parens around it.
For some reason, a lot of folks seem to assume that the ternary operator has
much higher precedence than it does and get confused by the result, but if
you just look at the operator precedence table, it should be pretty obvious
why you're seeing what you're seeing:

https://wiki.dlang.org/Operator_precedence

- Jonathan M Davis

Re: Should this Compile?

[H. S. Teoh via Digitalmars-d-learn]

On Tue, Oct 03, 2017 at 10:37:17PM +, SamwiseFilmore via 
Digitalmars-d-learn wrote:
[...]
> string toString() {
> return
> this.value.toString() ~
> " of " ~
> this.suit.toString() ~
> this.suit == CardSuit.diamonds ? "" : "\t" ~
> "\tfacing " ~
> this.facing.toString();
> }
[...]
> This code does not compile with this error message: Error:
> incompatible types for ((toString(this.p_value) ~ " of " ~
> toString(this.p_suit)) ~ (this.p_suit)): 'string' and 'CardSuit'
> 
> Am I using the ternary operator correctly here, or is this an issue
> with dmd? I'm using dmd v2.076.0.

When in doubt, always parenthesize around the ?: operator to prevent
ambiguities.  I'd write that line as:

... ~ ((this.suit == CardSuit.diamonds) ? "" : "\t") ~ ...

It's a few characters more, but will save you headaches from obscure
errors caused by unexpected operator precedences.


T

-- 
A linguistics professor was lecturing to his class one day.
"In English," he said, "A double negative forms a positive. In some
languages, though, such as Russian, a double negative is still a
negative. However, there is no language wherein a double positive can
form a negative."
A voice from the back of the room piped up, "Yeah, yeah."

Re: Should this Compile?

[SamwiseFilmore via Digitalmars-d-learn]

On Tuesday, 3 October 2017 at 22:37:17 UTC, SamwiseFilmore wrote:
Am I using the ternary operator correctly here, or is this an 
issue with dmd? I'm using dmd v2.076.0.


I wrapped the ternary in parentheses, and it compiled. Still, I'm 
wondering about this behavior.

Should this Compile?

[SamwiseFilmore via Digitalmars-d-learn]

I've created toString() for a struct (which is a lot more 
complicated than what I've provided here) that returns a large 
number of concatenated strings. Here is the example:


struct Card {
// Flesh out these enums appropriately
CardSuit suit;
CardValue value;
Facing facing;

string toString() {
return
this.value.toString() ~
" of " ~
this.suit.toString() ~
this.suit == CardSuit.diamonds ? "" : "\t" ~
"\tfacing " ~
this.facing.toString();
}
}

This code does not compile with this error message:
Error: incompatible types for ((toString(this.p_value) ~ " of " ~ 
toString(this.p_suit)) ~ (this.p_suit)): 'string' and 'CardSuit'


Am I using the ternary operator correctly here, or is this an 
issue with dmd? I'm using dmd v2.076.0.


This is the ideal way to implement this function, although I 
could do it other ways.

Re: non-block reading from pipe stdout

[Oleg B via Digitalmars-d-learn]

On Tuesday, 3 October 2017 at 12:32:43 UTC, kdevel wrote:
IMHO a program should sleep (consume 0 CPU time and 0 energy) 
if there is nothing to process. This is best accomplished by 
not polling on a file descriptor in order to check if data has 
arrived. If your program must yield() there's probably 
something wrong with the design. I would suggest you put all 
the filedescriptors into a fd_set an then select(3) on the set.


Programs based on fibers can't sleep while wait data and it's not 
a design problem.

For fun: Expressive C++ 17 Coding Challenge in D

[Ali Çehreli via Digitalmars-d-learn]

Found on Reddit:


https://www.reddit.com/r/programming/comments/740617/the_expressive_c17_coding_challenge/

How would you do it in D?

Ali

P.S. You can ignore the following note from the challenge text; I don't 
think it applies to D. Honestly, I don't think it matters for C++17 
either. :)


  "You can assume input files won't be super large and can fit fully 
into memory."

Re: Is there further documentation of core.atomic.MemoryOrder?

[Nathan S. via Digitalmars-d-learn]

Thank you. For anyone else with the same question, I also found 
this page helpful:

http://en.cppreference.com/w/cpp/atomic/memory_order

Re: Does D support nested Templates aka Higher Kinded Polymorphism?

[sighoya via Digitalmars-d-learn]

On Tuesday, 3 October 2017 at 15:52:52 UTC, sighoya wrote:

On Tuesday, 3 October 2017 at 15:30:52 UTC, Daniel Kozak wrote:

writeln(bar!(Bar,Foo,int)(Bar!(Foo,int)()));

Dne 3. 10. 2017 3:55 odpoledne napsal uživatel "sighoya via 
Digitalmars-d-learn" :


But when I write this to:

writeln(bar!(Bar,Foo,int)(Bar!(Foo,int)));

it complains by:

test.d(11): Error: template instance T!(S!int) does not match 
template

declaration Bar(R, S)
test.d(11): Error: template instance T!(S!int) does not match 
template

declaration Bar(R, S)
test.d(17): Error: template instance test.bar!(Bar, Foo, int) 
error

instantiating


I still get

test.d(11): Error: template instance T!(S!int) does not match 
template declaration Bar(R, S)
test.d(11): Error: template instance T!(S!int) does not match 
template declaration Bar(R, S)
test.d(18): Error: template instance test.bar!(Bar, Foo, int) 
error instantiating



by

struct Foo(T) {
T value;
}

struct Bar (R,S) {
R!S fooint;
}


//T!S foo(S, alias T)(T!S v) { return v; }
T!(S!R) bar(alias T,alias S,R)(T!(S!R) v) {return v;}


void main() {
import std.stdio;   
//writeln(foo!(int, Foo)(Foo!int(1)));
//writeln(bar!(Bar,Foo,int)(Bar!(Foo,int)));
writeln(bar!(Bar,Foo,int)(Bar!(Foo,int)()));
}


Thanks!!!

Re: Does D support nested Templates aka Higher Kinded Polymorphism?

[Daniel Kozak via Digitalmars-d-learn]

https://run.dlang.io/is/oqbYNb

On Tue, Oct 3, 2017 at 5:52 PM, sighoya via Digitalmars-d-learn <
digitalmars-d-learn@puremagic.com> wrote:

> On Tuesday, 3 October 2017 at 15:30:52 UTC, Daniel Kozak wrote:
>
>> writeln(bar!(Bar,Foo,int)(Bar!(Foo,int)()));
>>
>> Dne 3. 10. 2017 3:55 odpoledne napsal uživatel "sighoya via
>> Digitalmars-d-learn" :
>>
>> But when I write this to:
>>
>> writeln(bar!(Bar,Foo,int)(Bar!(Foo,int)));
>>
>> it complains by:
>>
>> test.d(11): Error: template instance T!(S!int) does not match template
>> declaration Bar(R, S)
>> test.d(11): Error: template instance T!(S!int) does not match template
>> declaration Bar(R, S)
>> test.d(17): Error: template instance test.bar!(Bar, Foo, int) error
>> instantiating
>>
>
> I still get
>
> test.d(11): Error: template instance T!(S!int) does not match template
> declaration Bar(R, S)
> test.d(11): Error: template instance T!(S!int) does not match template
> declaration Bar(R, S)
> test.d(18): Error: template instance test.bar!(Bar, Foo, int) error
> instantiating
>
>
> by
>
> struct Foo(T) {
> T value;
> }
>
> struct Bar (R,S) {
> R!S fooint;
> }
>
>
> //T!S foo(S, alias T)(T!S v) { return v; }
> T!(S!R) bar(alias T,alias S,R)(T!(S!R) v) {return v;}
>
>
> void main() {
> import std.stdio;
> //writeln(foo!(int, Foo)(Foo!int(1)));
> //writeln(bar!(Bar,Foo,int)(Bar!(Foo,int)));
> writeln(bar!(Bar,Foo,int)(Bar!(Foo,int)()));
> }
>
>
>

Re: Does D support nested Templates aka Higher Kinded Polymorphism?

[sighoya via Digitalmars-d-learn]

On Tuesday, 3 October 2017 at 15:30:52 UTC, Daniel Kozak wrote:

writeln(bar!(Bar,Foo,int)(Bar!(Foo,int)()));

Dne 3. 10. 2017 3:55 odpoledne napsal uživatel "sighoya via 
Digitalmars-d-learn" :


But when I write this to:

writeln(bar!(Bar,Foo,int)(Bar!(Foo,int)));

it complains by:

test.d(11): Error: template instance T!(S!int) does not match 
template

declaration Bar(R, S)
test.d(11): Error: template instance T!(S!int) does not match 
template

declaration Bar(R, S)
test.d(17): Error: template instance test.bar!(Bar, Foo, int) 
error

instantiating


I still get

test.d(11): Error: template instance T!(S!int) does not match 
template declaration Bar(R, S)
test.d(11): Error: template instance T!(S!int) does not match 
template declaration Bar(R, S)
test.d(18): Error: template instance test.bar!(Bar, Foo, int) 
error instantiating



by

struct Foo(T) {
T value;
}

struct Bar (R,S) {
R!S fooint;
}


//T!S foo(S, alias T)(T!S v) { return v; }
T!(S!R) bar(alias T,alias S,R)(T!(S!R) v) {return v;}


void main() {
import std.stdio;   
//writeln(foo!(int, Foo)(Foo!int(1)));
//writeln(bar!(Bar,Foo,int)(Bar!(Foo,int)));
writeln(bar!(Bar,Foo,int)(Bar!(Foo,int)()));
}

Vibe.d using Windows Certificate binding, possible?

[Jesse Phillips via Digitalmars-d-learn]

I'm pretty sure this isn't possible, but maybe someone 
understands Windows better.


Windows provides a means no bind a certificate to a port using 
netsh.exe. This means (at least for standard Windows networking 
calls) connections to that port will be given the bound cert.


The Vibe.d documents state that a Certificate chain and key needs 
to be provided. I'm pretty sure that the port binding requires 
very specific Network API calls, possible .NET only. Can any 
confirm or deny?

Re: Does D support nested Templates aka Higher Kinded Polymorphism?

[Daniel Kozak via Digitalmars-d-learn]

writeln(bar!(Bar,Foo,int)(Bar!(Foo,int)()));

Dne 3. 10. 2017 3:55 odpoledne napsal uživatel "sighoya via
Digitalmars-d-learn" :

But when I write this to:

writeln(bar!(Bar,Foo,int)(Bar!(Foo,int)));

it complains by:

test.d(11): Error: template instance T!(S!int) does not match template
declaration Bar(R, S)
test.d(11): Error: template instance T!(S!int) does not match template
declaration Bar(R, S)
test.d(17): Error: template instance test.bar!(Bar, Foo, int) error
instantiating

Re: Does D support nested Templates aka Higher Kinded Polymorphism?

[sighoya via Digitalmars-d-learn]

But when I write this to:

writeln(bar!(Bar,Foo,int)(Bar!(Foo,int)));

it complains by:

test.d(11): Error: template instance T!(S!int) does not match 
template declaration Bar(R, S)
test.d(11): Error: template instance T!(S!int) does not match 
template declaration Bar(R, S)
test.d(17): Error: template instance test.bar!(Bar, Foo, int) 
error instantiating

Re: Does D support nested Templates aka Higher Kinded Polymorphism?

[Adam D. Ruppe via Digitalmars-d-learn]

On Tuesday, 3 October 2017 at 13:31:00 UTC, sighoya wrote:

struct Bar (R,S) {



T!(S!R) bar(alias T,alias S,R)(T!(S!R) v) {return v;}


Bar takes two arguments, but here you are only passing one. Keep 
in mind that T!(...) is Bar. You called T!(S!(R)) when it was 
actually written to accept T!(S, R)



It might help to forget about the ! and just think of regular 
functions.


Bar(R, S); is the definition

but inside you called

T(S(R))

when it expected

T(S, R)

Re: Does D support nested Templates aka Higher Kinded Polymorphism?

[sighoya via Digitalmars-d-learn]

Thanks,
How do I construct such a type. I don't get it done right with:

struct Foo(T) {
T value;
}

struct Bar (R,S) {
R!S fooint;
}

T!(S!R) bar(alias T,alias S,R)(T!(S!R) v) {return v;}


void main() {
import std.stdio;   
writeln(bar!(Bar,Foo,int)(Bar!(Foo!int(1.0;
}

Re: Does D support nested Templates aka Higher Kinded Polymorphism?

[Jerry via Digitalmars-d-learn]

On Tuesday, 3 October 2017 at 12:58:47 UTC, sighoya wrote:
On Tuesday, 3 October 2017 at 12:09:04 UTC, rikki cattermole 
wrote:

On 03/10/2017 1:05 PM, sighoya wrote:

Especially, I mean something like

T foo(S,T)(T i)
{
     ...
}


struct Foo(T) {
T value;
}

T!S foo(S, alias T)(T!S v) { return v; }


void main() {
import std.stdio;   
writeln(foo!(int, Foo)(Foo!int(1)));
}


Cool, but it seems that only a nesting of two is allowed, right?
This one gives an error:

T!S!R bar(alias T,alias S,R)(T!S!R v) {return v;}
Error: multiple ! arguments are not allowed


That is because you have to wrap multiple with ().
Use
  T!(S!R)
instead.

Re: Does D support nested Templates aka Higher Kinded Polymorphism?

[sighoya via Digitalmars-d-learn]

On Tuesday, 3 October 2017 at 12:09:04 UTC, rikki cattermole 
wrote:

On 03/10/2017 1:05 PM, sighoya wrote:

Especially, I mean something like

T foo(S,T)(T i)
{
     ...
}


struct Foo(T) {
T value;
}

T!S foo(S, alias T)(T!S v) { return v; }


void main() {
import std.stdio;   
writeln(foo!(int, Foo)(Foo!int(1)));
}


Cool, but it seems that only a nesting of two is allowed, right?
This one gives an error:

T!S!R bar(alias T,alias S,R)(T!S!R v) {return v;}
Error: multiple ! arguments are not allowed

Re: non-block reading from pipe stdout

[kdevel via Digitalmars-d-learn]

On Tuesday, 3 October 2017 at 12:20:09 UTC, Oleg B wrote:

while (!tryWait(pp.pid).terminated)
{
auto cnt = read(fd, buf.ptr, buf.length); // 
C-style reading
if (cnt == -1 && errno == EAGAIN) // C-style error 
checking

yield();
else if (cnt > 0)
{
doSomething(buf[0..cnt]);
yield();
}
}


IMHO a program should sleep (consume 0 CPU time and 0 energy) if 
there is nothing to process. This is best accomplished by not 
polling on a file descriptor in order to check if data has 
arrived. If your program must yield() there's probably something 
wrong with the design. I would suggest you put all the 
filedescriptors into a fd_set an then select(3) on the set.

Re: non-block reading from pipe stdout

[Oleg B via Digitalmars-d-learn]

On Tuesday, 3 October 2017 at 10:45:21 UTC, kdevel wrote:

On Tuesday, 3 October 2017 at 00:22:28 UTC, Oleg B wrote:

but get error "Resource temporarily unavailable".


You get EAGAIN because there is no data available at the time 
of reading.


From the manpage of read:

ERRORS
   EAGAIN Non-blocking  I/O has been selected using 
O_NONBLOCK and no data

  was immediately available for reading.


I found only one way: C-style

auto pp = pipeShell(updaterScriptCommand, Redirect.all,
null, Config.none, workDir);

import core.sys.posix.unistd : read;
import core.stdc.errno;
import core.sys.posix.fcntl;

int fd = pp.stdout.fileno;
int flags = fcntl(fd, F_GETFL, 0);
flags |= O_NONBLOCK;
fcntl(fd, F_SETFL, flags); // C-style setting file config

char[256] buf;
while (!tryWait(pp.pid).terminated)
{
auto cnt = read(fd, buf.ptr, buf.length); // C-style 
reading
if (cnt == -1 && errno == EAGAIN) // C-style error 
checking

yield();
else if (cnt > 0)
{
doSomething(buf[0..cnt]);
yield();
}
}

Re: non-block reading from pipe stdout

[kdevel via Digitalmars-d-learn]

On Tuesday, 3 October 2017 at 11:36:28 UTC, Oleg B wrote:
   EAGAIN Non-blocking  I/O has been selected using 
O_NONBLOCK and no data

  was immediately available for reading.


And I can't check this without using exception handling?


Your programm shall not read before data is available. Use 
core.sys.posix.sys.select to check if read would block on a 
blocking socket.

Does D support nested Templates aka Higher Kinded Polymorphism?

[sighoya via Digitalmars-d-learn]

Especially, I mean something like

T foo(S,T)(T i)
{
...
}

Re: Does D support nested Templates aka Higher Kinded Polymorphism?

[rikki cattermole via Digitalmars-d-learn]

On 03/10/2017 1:05 PM, sighoya wrote:

Especially, I mean something like

T foo(S,T)(T i)
{
     ...
}


struct Foo(T) {
T value;
}

T!S foo(S, alias T)(T!S v) { return v; }


void main() {
import std.stdio;   
writeln(foo!(int, Foo)(Foo!int(1)));
}

Re: non-block reading from pipe stdout

[Oleg B via Digitalmars-d-learn]

On Tuesday, 3 October 2017 at 10:45:21 UTC, kdevel wrote:

On Tuesday, 3 October 2017 at 00:22:28 UTC, Oleg B wrote:

but get error "Resource temporarily unavailable".


You get EAGAIN because there is no data available at the time 
of reading.


From the manpage of read:

ERRORS
   EAGAIN Non-blocking  I/O has been selected using 
O_NONBLOCK and no data

  was immediately available for reading.


And I can't check this without using exception handling?

Re: non-block reading from pipe stdout

[kdevel via Digitalmars-d-learn]

On Tuesday, 3 October 2017 at 00:22:28 UTC, Oleg B wrote:

but get error "Resource temporarily unavailable".


You get EAGAIN because there is no data available at the time of 
reading.


From the manpage of read:

ERRORS
   EAGAIN Non-blocking  I/O has been selected using 
O_NONBLOCK and no data

  was immediately available for reading.

Looking for a mentor in D

[eastanon via Digitalmars-d-learn]

I have been reading the D forums for a while and following on its 
amazing progress for a long time. Over time I have even written 
some basic D programs for myself, nothing major or earth 
shuttering.  I have downloaded and read Ali's excellent book.


I would like to dive deeper into D, however sometimes it can get 
intimidating when I read some of the discussions on the forums 
and I realise I know nothing.  People argue on and on about a 
feature or lack of and the future of the language and it starts 
to cast doubts on my desire to learn and be proficient in D.


I would like to choose D as my go to language and to do that I 
realise I need a mentor, someone who will walk and guide me and 
not get irritated by basic questions. I am pretty much a DIY 
person, so don't worry about mundane issues.  I want to have 
someone with whom I can discuss some practical choices and 
algorithms. I am a self-taught programmer and never took CS 
classes. I am good in R, Python and Ruby.


Please let  me know if you would like to be a D mentor.