I find D's %( and %) range format specifiers very useful:

import std.stdio;
import std.range;

void main() {
  5.iota.writefln!"%(%s, %)";  // Prints 0, 1, 2, 3, 4
}

Are there similar features in other languages?

Thank you,
Ali

On Sunday, 11 October 2020 at 23:57:31 UTC, Ali Çehreli wrote:
> I find D's %( and %) range format specifiers very useful:
>
> import std.stdio;
> import std.range;
>
> void main() {
>   5.iota.writefln!"%(%s, %)";  // Prints 0, 1, 2, 3, 4
> }
>
> Are there similar features in other languages?
>
> Thank you,
> Ali

I think rust can do something similar with struct pretty printing. The syntax has curly braces in it but I can't recall it right now.

Possibly worth showing off (especially given that some people at first don't even know the templated format string exists)

On Sunday, 11 October 2020 at 23:57:31 UTC, Ali Çehreli wrote:
> I find D's %( and %) range format specifiers very useful:
>
> import std.stdio;
> import std.range;
>
> void main() {
>   5.iota.writefln!"%(%s, %)";  // Prints 0, 1, 2, 3, 4
> }
>
> Are there similar features in other languages?
>
> Thank you,
> Ali

To people trying to learn, why is that % before ( needed in the format string?

On Monday, 12 October 2020 at 00:46:37 UTC, Imperatorn wrote:
> To people trying to learn, why is that % before ( needed in the format string?

The %( ... %) stuff is expanded and repeated for each element inside the given array.

On 10/11/20 5:44 PM, Max Haughton wrote:

> Possibly worth showing off (especially given that some people at first
> don't even know the templated format string exists)

This feature is already among my slides for an upcoming conference. ;)

Ali

On Monday, 12 October 2020 at 00:59:33 UTC, Adam D. Ruppe wrote:
> On Monday, 12 October 2020 at 00:46:37 UTC, Imperatorn wrote:
>> To people trying to learn, why is that % before ( needed in the format string?
>
> The %( ... %) stuff is expanded and repeated for each element inside the given array.

Thanks, it seems there are some pretty powerful formatting options:

https://dlang.org/phobos/std_format.html

On Mon, Oct 12, 2020 at 05:51:21AM +0000, Imperatorn via Digitalmars-d-learn wrote:
> On Monday, 12 October 2020 at 00:59:33 UTC, Adam D. Ruppe wrote:
> > On Monday, 12 October 2020 at 00:46:37 UTC, Imperatorn wrote:
> > > To people trying to learn, why is that % before ( needed in the format string?
> > 
> > The %( ... %) stuff is expanded and repeated for each element inside
> > the given array.
> 
> Thanks, it seems there are some pretty powerful formatting options:
> 
> https://dlang.org/phobos/std_format.html

Indeed.

%(...%) is one of my favorite because it can be nested, so it's a very useful quick-n-dirty tool for debugging ranges. With .chunks and .map, you can format just about any range-based data in a one-liner for dumping debug info.

Another cool one is the `,` digit-grouper:

	import std;
	void main() {
		writefln("%,2d", 1234567890);
		writefln("%,3d", 1234567890);
		writefln("%,4d", 1234567890);
		writefln("%,3?d", '_', 1234567890);
		writefln("%,4?d", '\'', 1234567890);
		writefln("%,4?.2f", '\'', 1234567890.123);
	}

Output:
	12,34,56,78,90
	1,234,567,890
	12,3456,7890
	1_234_567_890
	12'3456'7890
	12'3456'7890.12


T

-- 
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