• dangbinghoo (13/13) Sep 16 2020 hi,
• JG (20/33) Sep 16 2020 Perhaps there are other ways, but you can use enumerate. For
• Paul Backus (6/16) Sep 16 2020 Worth knowing that the tuples you get from enumerate actually
• dangbinghoo (4/21) Sep 16 2020 thanks you! and thanks to JG.
• Jacob Carlborg (6/10) Sep 18 2020 It actually works out of the box for `each`:

dangbinghoo <dangbinghoo google-mail.com> writes:

hi,

is there any way to get the index for an element when iteration 
using each!(x)?

  I know I can do this using foreach statement, but I prefer using 
the each template.

-----------
string s = "hello";
foreach(i, c; s) {
}
----------

how can I get to ?


Thanks!

binghoo dang

JG <someone somewhere.com> writes:

On Thursday, 17 September 2020 at 00:51:54 UTC, dangbinghoo wrote:
 hi,

 is there any way to get the index for an element when iteration 
 using each!(x)?

  I know I can do this using foreach statement, but I prefer 
 using the each template.

 -----------
 string s = "hello";
 foreach(i, c; s) {
 }
 ----------

 how can I get to ?


 Thanks!

 binghoo dang

Perhaps there are other ways, but you can use enumerate. For 
example
-----------
import std.algorithm;
import std.range;
import std.stdio;
void main() {
  string s = "hello";
  s.enumerate.each!(x=>writeln(x[0],":",x[1]));
}
-----------
Produces
-----------
0:h
1:e
2:l
3:l
4:o
-----------

Paul Backus <snarwin gmail.com> writes:

On Thursday, 17 September 2020 at 03:14:08 UTC, JG wrote:
 Perhaps there are other ways, but you can use enumerate. For 
 example
 -----------
 import std.algorithm;
 import std.range;
 import std.stdio;
 void main() {
  string s = "hello";
  s.enumerate.each!(x=>writeln(x[0],":",x[1]));
 }

Worth knowing that the tuples you get from enumerate actually 
have named members, so you can write:

     s.enumerate.each!(x => writeln(x.index, ":", x.value));

Documentation: 
http://dpldocs.info/experimental-docs/std.range.enumerate.html

dangbinghoo <dangbinghoo google-mail.com> writes:

On Thursday, 17 September 2020 at 03:16:42 UTC, Paul Backus wrote:
 On Thursday, 17 September 2020 at 03:14:08 UTC, JG wrote:
 Perhaps there are other ways, but you can use enumerate. For 
 example
 -----------
 import std.algorithm;
 import std.range;
 import std.stdio;
 void main() {
  string s = "hello";
  s.enumerate.each!(x=>writeln(x[0],":",x[1]));
 }

 Worth knowing that the tuples you get from enumerate actually 
 have named members, so you can write:

     s.enumerate.each!(x => writeln(x.index, ":", x.value));

 Documentation: 
 http://dpldocs.info/experimental-docs/std.range.enumerate.html

thanks you! and thanks to JG.

---------
binghoo

Jacob Carlborg <doob me.com> writes:

On 2020-09-17 05:16, Paul Backus wrote:

 Worth knowing that the tuples you get from enumerate actually have named 
 members, so you can write:
 
      s.enumerate.each!(x => writeln(x.index, ":", x.value));

It actually works out of the box for `each`:

s.each!((index, value) => writeln(index, ":", value));

https://dlang.org/phobos/std_algorithm_iteration.html#.each

-- 
/Jacob Carlborg