newbie question: Can D do this?

Thank you for your quick replies.  I'm impressed by the helpfulness and
dedication of the D community!
Here's another one. Is there a way to pass arguments to functions by
keyword as in the calls to f and g below?

void f(int a = 0, int b = 1) {}
void g(int a) {}

void main() {
     f(b = 1, a = 0); // compile error
     g(a = 0); // also compile error
}

On 12/19/2011 03:00 PM, digitalmars-d-learn-request@puremagic.com wrote:
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> Today's Topics:
>
>     1. Re: newbie question: Can D do this? (Ali ?ehreli)
>     2. Re: newbie question: Can D do this? (Kai Meyer)
>     3. Re: newbie question: Can D do this? (Simen Kj?r?s)
>     4. Re: newbie question: Can D do this? (Ali ?ehreli)
>     5. Re: newbie question: Can D do this? (Jonathan M Davis)
>
>
> ----------------------------------------------------------------------
>
> Message: 1
> Date: Mon, 19 Dec 2011 10:41:29 -0800
> From: Ali ?ehreli<acehreli@yahoo.com>
> To: digitalmars-d-learn@puremagic.com
> Subject: Re: newbie question: Can D do this?
> Message-ID:<jco0gq$1ilt$1@digitalmars.com>
> Content-Type: text/plain; charset=UTF-8; format=flowed
>
> On 12/19/2011 08:17 AM, clk wrote:
>
>   >  I'm a little bit intimidated by the fact that the topics in the d-learn
>   >  list look rather advanced to a newbie like me.
>
> We need more newbie topics here! :)
>
>   >  1) Does D support something like the javascript 1.8 destructuring
>   >  assigment (multiple assigment in python):
>   >
>   >  [a, b] = [b, a];
>
> No multiple assignment like that. But useful approarches exist for most needs, like the swap that simendsjo has shown.
>
>   >  2) D doesn't seem to support the list comprehension syntax available in
>   >  python and javascript. Is this correct?
>   >
>   >  [f(x) for x in list if condition]
>
> List comprehension is not part of the language.
>
> import std.algorithm;
>
> void f(int x)
> {}
>
> bool condition(int x)
> {
>       return true;
> }
>
> void main()
> {
>       auto list = [ 0, 1, 2 ];
>       map!f(filter!condition(list));
> }
>
> You can define f and condition within the body of main().
>
> It is possible to use function literals as well:
>
> import std.algorithm;
>
> void main()
> {
>       auto list = [ 0, 1, 2 ];
>       map!((x){
>               /* ... this is f(x) ...*/
>           })(filter!((x) {
>                       return true; /* ... condition ... */
>                   })(list));
> }
>
>   >  3) D's slice operator apparently doesn't allow the use of a stride other
>   >  than unity as is allowed with fortran and matlab. Is there a way to
>   >  implement this feature so that
>   >
>   >  [1, 2, 3, 4, 5][0..$:2] would refer to [1, 3, 5], etc..., where 2 is the
>   >  non unit stride. Or is the find function from std.algorithm the only
>   >  option to achieve the same behavior.
>
> std.range.stride does that:
>
> import std.range;
> // ...
> stride([1, 2, 3, 4, 5], 2)
>
>   >
>   >  I find the 3 features above extremely convenient in every day coding.
>   >  Thanks,
>   >  -clk
>   >
>   >
>
> Ali
>
>
>
> ------------------------------
>
> Message: 2
> Date: Mon, 19 Dec 2011 11:50:33 -0700
> From: Kai Meyer<kai@unixlords.com>
> To: digitalmars-d-learn@puremagic.com
> Subject: Re: newbie question: Can D do this?
> Message-ID:<jco11q$1lle$1@digitalmars.com>
> Content-Type: text/plain; charset=ISO-8859-1; format=flowed
>
> On 12/19/2011 09:17 AM, clk wrote:
>> Hello,
>> I'm new to this mailing list. I'm trying to learn D to eventually use it
>> in production code.
>> I'm a little bit intimidated by the fact that the topics in the d-learn
>> list look rather advanced to a newbie like me.
>> I have 3 fairly simple questions:
>>
>> 1) Does D support something like the javascript 1.8 destructuring
>> assigment (multiple assigment in python):
>>
>> [a, b] = [b, a];
> I would love multiple assignment like this, but it's tricky. But your usage isn't really multiple assignment as much as it is a swap. What I'd love is something like this:
>
> [a, b, c] = [get_a(), get_b(), get_c()];
>
> Or
>
> [a, b, c] = [to!(int)(argv[1]), some_other_value, argv[4]);
>
>
>
>> 2) D doesn't seem to support the list comprehension syntax available in python and javascript. Is this correct?
>>
>> [f(x) for x in list if condition]
> No, D's syntax is very C-ish. I don't expect syntax like this to ever show up (though what you are doing is possible with things like std.algorithm)
>
>> 3) D's slice operator apparently doesn't allow the use of a stride other than unity as is allowed with fortran and matlab. Is there a way to implement this feature so that
>>
>> [1, 2, 3, 4, 5][0..$:2] would refer to [1, 3, 5], etc..., where 2 is the non unit stride. Or is the find function from std.algorithm the only option to achieve the same behavior.
> Ya, std.range, like Ali said.
>
>> I find the 3 features above extremely convenient in every day coding.
>> Thanks,
>> -clk
>>
>
>
> ------------------------------
>
> Message: 3
> Date: Mon, 19 Dec 2011 20:01:06 +0100
> From: Simen Kj?r?s<simen.kjaras@gmail.com>
> To: digitalmars-d-learn@puremagic.com
> Subject: Re: newbie question: Can D do this?
> Message-ID:<op.v6q234mt0gpyof@biotronic.lan>
> Content-Type: text/plain; charset=utf-8; format=flowed; delsp=yes
>
> On Mon, 19 Dec 2011 17:17:43 +0100, clk<clk@clksoft.com>  wrote:
>
>> Hello,
>> I'm new to this mailing list.  I'm trying to learn D  to eventually use
>> it in production code.
>> I'm a little bit intimidated by the fact that the topics in the d-learn
>> list look rather advanced to a newbie like me.
>> I have 3 fairly simple questions:
>>
>> 1) Does D support something like the javascript 1.8 destructuring
>> assigment (multiple assigment in python):
>>
>> [a, b] = [b, a];
>
> This, or something quite like it, was covered on Saturday in the thread "Alias/Ref Tuples ?". This works (but is hardly as elegant as Python's syntax:
>
> import std.typetuple : TypeTuple;
> import std.typecons : tuple;
>
> TypeTuple!(a, b) = tuple(b,a);
>
>
> ------------------------------
>
> Message: 4
> Date: Mon, 19 Dec 2011 11:07:49 -0800
> From: Ali ?ehreli<acehreli@yahoo.com>
> To: digitalmars-d-learn@puremagic.com
> Subject: Re: newbie question: Can D do this?
> Message-ID:<jco225$1r5m$1@digitalmars.com>
> Content-Type: text/plain; charset=UTF-8; format=flowed
>
> On 12/19/2011 10:39 AM, Jonathan M Davis wrote:
>   >  it's a range (see
>   >  http://www.informit.com/articles/printerfriendly.aspx?p=1407357 for a
> general
>   >  explanation of the concept of ranges)
>
> That's a great article.[1] I hope that this chapter is more beginner-friendly:
>
>     http://ddili.org/ders/d.en/ranges.html
>
> Ali
>
> [1] Andrei's article has a Turkish translation as well:
>
>     http://ddili.org/makale/eleman_erisimi_uzerine.html
>
>
>
> ------------------------------
>
> Message: 5
> Date: Mon, 19 Dec 2011 14:30:39 -0500
> From: "Jonathan M Davis"<jmdavisProg@gmx.com>
> To: "digitalmars.D.learn"<digitalmars-d-learn@puremagic.com>
> Subject: Re: newbie question: Can D do this?
> Message-ID:<20111219193039.5420@gmx.com>
> Content-Type: text/plain; charset="utf-8"
>
> On Monday, December 19, 2011 11:07:49 Ali ?ehreli wrote:
>> That's a great article.[1] I hope that this chapter is more beginner-friendly:
>>
>> http://ddili.org/ders/d.en/ranges.html
> Cool. One of the things that we're missing on the website is a solid article on ranges (I started such an article a while back and really should go back and finish it), but having something like this to link to should be quite useful. I'll have to give it a read. Thanks!
>
> - Jonathan M Davis
>
>
> ------------------------------
>
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> End of Digitalmars-d-learn Digest, Vol 71, Issue 29 ***************************************************
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