• forkit (13/13) Jan 14 2022 I want int[][] like this -> [[1, 2, 3, 4, 5], [6, 7, 8, 9, 10],
• Paul Backus (4/17) Jan 14 2022 import std.algorithm: map;
• forkit (4/7) Jan 14 2022 oh. thanks!
• Steven Schveighoffer (6/31) Jan 14 2022 Alternatively (with only one allocation for the int[] data):
• forkit (11/16) Jan 14 2022 All answers were helpful ;-)
• Salih Dincer (4/15) Jan 14 2022 I loved it too. I think this is because chunks() is very
• H. S. Teoh (7/9) Jan 14 2022 [...]

forkit <forkit gmail.com> writes:

I want int[][] like this -> [[1, 2, 3, 4, 5], [6, 7, 8, 9, 10], 
[11, 12, 13, 14, 15]]

Any help will be appreciated.

note: to2Darray is not a valid statement ;-)


// ---
module test;

import std;

void main()
{
     int[][] arrayOfarrays = iota(1, 16).chunks(5).to2Darray; // 
how to convert this into [][]
}
// ---

Paul Backus <snarwin gmail.com> writes:

On Saturday, 15 January 2022 at 01:49:14 UTC, forkit wrote:
 I want int[][] like this -> [[1, 2, 3, 4, 5], [6, 7, 8, 9, 10], 
 [11, 12, 13, 14, 15]]

 Any help will be appreciated.

 note: to2Darray is not a valid statement ;-)


 // ---
 module test;

 import std;

 void main()
 {
     int[][] arrayOfarrays = iota(1, 16).chunks(5).to2Darray; // 
 how to convert this into [][]
 }
 // ---

import std.algorithm: map;
import std.array: array;

int[][] arrayOfArrays = iota(1, 16).chunks(5).map!array.array;

forkit <forkit gmail.com> writes:

On Saturday, 15 January 2022 at 02:41:08 UTC, Paul Backus wrote:
 import std.algorithm: map;
 import std.array: array;

 int[][] arrayOfArrays = iota(1, 16).chunks(5).map!array.array;

oh. thanks!

also it seems I reposted the same question (didn't realise this 
one got posted)

Steven Schveighoffer <schveiguy gmail.com> writes:

On 1/14/22 9:41 PM, Paul Backus wrote:
 On Saturday, 15 January 2022 at 01:49:14 UTC, forkit wrote:
 I want int[][] like this -> [[1, 2, 3, 4, 5], [6, 7, 8, 9, 10], [11, 
 12, 13, 14, 15]]

 Any help will be appreciated.

 note: to2Darray is not a valid statement ;-)


 // ---
 module test;

 import std;

 void main()
 {
     int[][] arrayOfarrays = iota(1, 16).chunks(5).to2Darray; // how to 
 convert this into [][]
 }
 // ---

 
 import std.algorithm: map;
 import std.array: array;
 
 int[][] arrayOfArrays = iota(1, 16).chunks(5).map!array.array;

Alternatively (with only one allocation for the int[] data):

```d
int[][] arrayOfArrays = iota(1, 16).array.chunks(5).array;
```

-Steve

forkit <forkit gmail.com> writes:

On Saturday, 15 January 2022 at 03:48:41 UTC, Steven 
Schveighoffer wrote:
 Alternatively (with only one allocation for the int[] data):

 ```d
 int[][] arrayOfArrays = iota(1, 16).array.chunks(5).array;
 ```

 -Steve

All answers were helpful ;-)

But I like this one the best, because I find it both easier to 
remember, and easier to expand upon (i.e. for each extra [] just 
add another .chunks(val).array

e.g

int[][][] arrayOfArraysV4 = iota(1, 
16).array.chunks(2).array.chunks(3).array;

int[][][][] arrayOfArraysV5 = iota(1, 
16).array.chunks(2).array.chunks(3).array.chunks(4).array;

Salih Dincer <salihdb hotmail.com> writes:

On Saturday, 15 January 2022 at 06:43:05 UTC, forkit wrote:
 On Saturday, 15 January 2022 at 03:48:41 UTC, Steven 
 Schveighoffer wrote:
 int[][] arrayOfArrays = iota(1,16).
 array.chunks(5).array;

 -Steve

 All answers were helpful ;-)

 But I like this one the best,
 because I find it both easier to remember, and easier to 
 expand...

I loved it too.  I think this is because chunks() is very 
functional. I should mention this in the Turkish Forum.

Salih

"H. S. Teoh" <hsteoh quickfur.ath.cx> writes:

On Sat, Jan 15, 2022 at 01:49:14AM +0000, forkit via Digitalmars-d-learn wrote:
[...]
     int[][] arrayOfarrays = iota(1, 16).chunks(5).to2Darray; // how to
 convert this into [][]

[...]

	auto arrayOfArrays = iota(1, 16).chunks(5).map!(r => r.array).array;


T

-- 
Winners never quit, quitters never win. But those who never quit AND never win
are idiots.