Re: get element index when using each!(x)

[Jacob Carlborg via Digitalmars-d-learn]

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

Re: get element index when using each!(x)

[dangbinghoo via Digitalmars-d-learn]

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

Re: get element index when using each!(x)

[Paul Backus via Digitalmars-d-learn]

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

Re: get element index when using each!(x)

[JG via Digitalmars-d-learn]

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
---

get element index when using each!(x)

[dangbinghoo via Digitalmars-d-learn]

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