digitalmars.D.learn - Two-dimensional slices in D

"Dennis Ritchie" <dennis.ritchie mail.ru> writes:
```Hi,
Is it possible to somehow shorter turn to slice on D? Maybe you
can use tuples?

F#:
-----
printfn "%A" xs.[4 .. 7, 4 .. 9]
-----

D:
-----
writeln([a[4][4 .. \$], a[5][4 .. \$], a[6][4 .. \$], a[7][4 .. \$]]);
-----

F#:
-----
let xs = Array2D.init 10 10 (fun x y -> x * 10 + y)
printfn "[4 .. 7, 6 .. 9] = \n%A" xs.[4 .. 7, 4 .. 9]
-----
http://ideone.com/jjWlXQ

D:
-----
import std.stdio;

void main() {

auto a = [
[0, 1, 2, 3, 4, 5, 6, 7, 8, 9],
[10, 11, 12, 13, 14, 15, 16, 17, 18, 19],
[20, 21, 22, 23, 24, 25, 26, 27, 28, 29],
[30, 31, 32, 33, 34, 35, 36, 37, 38, 39],
[40, 41, 42, 43, 44, 45, 46, 47, 48, 49],
[50, 51, 52, 53, 54, 55, 56, 57, 58, 59],
[60, 61, 62, 63, 64, 65, 66, 67, 68, 69],
[70, 71, 72, 73, 74, 75, 76, 77, 78, 79],
[80, 81, 82, 83, 84, 85, 86, 87, 88, 89],
[90, 91, 92, 93, 94, 95, 96, 97, 98, 99]
];

foreach (i; 4 .. 8)
writeln(a[i][4 .. \$]);

/*	[44, 45, 46, 47, 48, 49]
[54, 55, 56, 57, 58, 59]
[64, 65, 66, 67, 68, 69]
[74, 75, 76, 77, 78, 79]  */

writefln("[%([%(%s, %)]%|\n %)]", [a[4][4 .. \$], a[5][4 .. \$],
a[6][4 .. \$], a[7][4 .. \$]]);

/* [[44, 45, 46, 47, 48, 49]
[54, 55, 56, 57, 58, 59]
[64, 65, 66, 67, 68, 69]
[74, 75, 76, 77, 78, 79]] */
}
-----
http://ideone.com/ACOcHJ
```
Apr 14 2015
"Ivan Kazmenko" <gassa mail.ru> writes:
```On Tuesday, 14 April 2015 at 14:21:41 UTC, Dennis Ritchie wrote:
writefln("[%([%(%s, %)]%|\n %)]", [a[4][4 .. \$], a[5][4 .. \$],
a[6][4 .. \$], a[7][4 .. \$]]);

At least this can be done as
-----
writefln("[%([%(%s, %)]%|\n %)]", a[4..8].map !(b => b[4 .. \$]));
-----
```
Apr 14 2015
"Dennis Ritchie" <dennis.ritchie mail.ru> writes:
```On Tuesday, 14 April 2015 at 15:16:10 UTC, Ivan Kazmenko wrote:
On Tuesday, 14 April 2015 at 14:21:41 UTC, Dennis Ritchie wrote:
writefln("[%([%(%s, %)]%|\n %)]", [a[4][4 .. \$], a[5][4 ..
\$], a[6][4 .. \$], a[7][4 .. \$]]);

At least this can be done as
-----
writefln("[%([%(%s, %)]%|\n %)]", a[4..8].map !(b => b[4 ..
\$]));
-----

Thanks.

On Tuesday, 14 April 2015 at 17:27:15 UTC, Ali Ã‡ehreli wrote:
On 04/14/2015 07:21 AM, Dennis Ritchie wrote:

F#:
-----
printfn "%A" xs.[4 .. 7, 4 .. 9]
-----

D supports that syntax as well:

http://dlang.org/operatoroverloading.html#slice

I have a simple example here:

http://ddili.org/ders/d.en/templates_more.html#ix_templates_more.multi-dimensional%20operator%20overloading

Ali

Yes, now I understand. Thanks.
```
Apr 14 2015
=?UTF-8?B?QWxpIMOHZWhyZWxp?= <acehreli yahoo.com> writes:
```On 04/14/2015 07:21 AM, Dennis Ritchie wrote:

F#:
-----
printfn "%A" xs.[4 .. 7, 4 .. 9]
-----

D supports that syntax as well:

http://dlang.org/operatoroverloading.html#slice

I have a simple example here:

http://ddili.org/ders/d.en/templates_more.html#ix_templates_more.multi-dimensional%20operator%20overloading

Ali
```
Apr 14 2015