• novice3 (19/19) Apr 07 2021 https://run.dlang.io/is/p4NVp8
• Paul Backus (5/10) Apr 07 2021 This is actually an intentional feature (albeit kind of a stupid
• novice2 (3/5) Apr 07 2021 sorry i dont read docs so carefully
• Paul Backus (7/13) Apr 07 2021 It's not your fault--this is a pretty obscure feature, and it's
• Berni44 (9/15) Apr 07 2021 The docs of `std.format` are currently under strong revision,
• Meta (4/18) Apr 07 2021 I have created a pull request that will hopefully make this more
• =?UTF-8?Q?Ali_=c3=87ehreli?= (7/14) Apr 07 2021 For the sake of completeness, I mention this feature in a couple of=20

novice3 <sorryno em.ail> writes:

https://run.dlang.io/is/p4NVp8
```d
void main()
{
     import std.stdio: writefln;
     string[] s = ["a", "b", "c"];
     writefln("%(%s, %)", s);
}
```
output
```d
"a", "b", "c"
```
expected
```d
a, b, c
```

there is extra quotes, wich not present in firmat specifier.
is this bug, or i should change something in my code?

Paul Backus <snarwin gmail.com> writes:

On Wednesday, 7 April 2021 at 13:31:59 UTC, novice3 wrote:
 there is extra quotes, wich not present in firmat specifier.
 is this bug, or i should change something in my code?

This is actually an intentional feature (albeit kind of a stupid 
one). From the documentation:

 Inside a compound format specifier, strings and characters are 
 escaped automatically. To avoid this behavior, add '-' flag to 
 "%(".

So, you should change your code to

     writefln("%-(%s, %)", s);

novice2 <sorryno em.ail> writes:

On Wednesday, 7 April 2021 at 13:43:18 UTC, Paul Backus wrote:
 So, you should change your code to

     writefln("%-(%s, %)", s);

sorry i dont read docs so carefully
thanks

Paul Backus <snarwin gmail.com> writes:

On Wednesday, 7 April 2021 at 17:04:56 UTC, novice2 wrote:
 On Wednesday, 7 April 2021 at 13:43:18 UTC, Paul Backus wrote:
 So, you should change your code to

     writefln("%-(%s, %)", s);

 sorry i dont read docs so carefully
 thanks

It's not your fault--this is a pretty obscure feature, and it's 
not documented very well. Even after you've found the correct 
page in the documentation (the page for `formattedWrite` [1]), 
you have to scroll down past multiple examples to find the text 
that explains it.

[1] https://dlang.org/phobos/std_format.html#formattedWrite

Berni44 <someone somemail.com> writes:

On Wednesday, 7 April 2021 at 17:31:09 UTC, Paul Backus wrote:
 It's not your fault--this is a pretty obscure feature, and it's 
 not documented very well. Even after you've found the correct 
 page in the documentation (the page for `formattedWrite` [1]), 
 you have to scroll down past multiple examples to find the text 
 that explains it.

 [1] https://dlang.org/phobos/std_format.html#formattedWrite

The docs of `std.format` are currently under strong revision, 
about 90% is already done, but that "feature" is among the other 
10%. I hope to get that ready till the end of the month, so the 
next stable release will have better docs.

Unfortunately it's much more difficult to change that strange 
behavior without breaking code. Currently I hope for Phobos 2.0 
coming soon and meanwhile try to prepare `std.format` for that 
change.

Meta <jared771 gmail.com> writes:

On Wednesday, 7 April 2021 at 17:31:09 UTC, Paul Backus wrote:
 On Wednesday, 7 April 2021 at 17:04:56 UTC, novice2 wrote:
 On Wednesday, 7 April 2021 at 13:43:18 UTC, Paul Backus wrote:
 So, you should change your code to

     writefln("%-(%s, %)", s);

 sorry i dont read docs so carefully
 thanks

 It's not your fault--this is a pretty obscure feature, and it's 
 not documented very well. Even after you've found the correct 
 page in the documentation (the page for `formattedWrite` [1]), 
 you have to scroll down past multiple examples to find the text 
 that explains it.

 [1] https://dlang.org/phobos/std_format.html#formattedWrite

I have created a pull request that will hopefully make this more 
prominent on the doc page:
https://github.com/dlang/phobos/pull/7944

=?UTF-8?Q?Ali_=c3=87ehreli?= <acehreli yahoo.com> writes:

On 4/7/21 10:04 AM, novice2 wrote:
 On Wednesday, 7 April 2021 at 13:43:18 UTC, Paul Backus wrote:
 So, you should change your code to

 =C2=A0=C2=A0=C2=A0 writefln("%-(%s, %)", s);

=20
 sorry i dont read docs so carefully
 thanks

For the sake of completeness, I mention this feature in a couple of=20
other places:

   http://ddili.org/ders/d.en/formatted_output.html#ix_formatted_output.%=
-(

   https://www.youtube.com/watch?v=3DdRORNQIB2wA&t=3D1146s

Ali