Is it possible to create a foreach loop with a breakstetemen?

I mean something like that for the second loop where i want to break if element from:

int []  g = [9,15,21];
int [] v = [2,3,5,7,8,9,11,13,17,19];

foreach(j;1..10)
for(int i = 0; v[i]<j;++i){
 do something;
}

On Monday, 19 October 2015 at 14:28:06 UTC, Namal wrote:
> Is it possible to create a foreach loop with a breakstetemen?
>
> I mean something like that for the second loop where i want to break if element from:
>
> int []  g = [9,15,21];
> int [] v = [2,3,5,7,8,9,11,13,17,19];
>
> foreach(j;1..10)
> for(int i = 0; v[i]<j;++i){
>  do something;
> }

Of course. D uses even the same keyword for this as C does: break.

V Mon, 19 Oct 2015 14:28:03 +0000
Namal via Digitalmars-d-learn <digitalmars-d-learn@puremagic.com>
napsáno:

> Is it possible to create a foreach loop with a breakstetemen?
> 
> I mean something like that for the second loop where i want to break if element from:
> 
> int []  g = [9,15,21];
> int [] v = [2,3,5,7,8,9,11,13,17,19];
> 
> foreach(j;1..10)
> for(int i = 0; v[i]<j;++i){
>   do something;
> }

I am not sure what you exactly want, but you can break foreach statement:

int []  g = [9,15,21];
int [] v = [2,3,5,7,8,9,11,13,17,19];

outerfor: foreach(j;1..10)
for(int i = 0; v[i]<j;++i){
  do something;
  if (iWantToBreak)
    break outerfor;
}

On 20/10/15 3:28 AM, Namal wrote:
> Is it possible to create a foreach loop with a breakstetemen?
>
> I mean something like that for the second loop where i want to break if
> element from:
>
> int []  g = [9,15,21];
> int [] v = [2,3,5,7,8,9,11,13,17,19];
>
> foreach(j;1..10)
> for(int i = 0; v[i]<j;++i){
>   do something;
> }

If you want to break a specific loop, use labels.

L1:
	foreach(i; 0 .. 10) {
	
	L2:	foreach(j; 0 .. 10) {
			// break L1;

			// break L2;
			// or
			// break;
		}
	}

On Monday, 19 October 2015 at 14:43:04 UTC, Rikki Cattermole wrote:
> On 20/10/15 3:28 AM, Namal wrote:
>> Is it possible to create a foreach loop with a breakstetemen?
>>
>> I mean something like that for the second loop where i want to break if
>> element from:
>>
>> int []  g = [9,15,21];
>> int [] v = [2,3,5,7,8,9,11,13,17,19];
>>
>> foreach(j;1..10)
>> for(int i = 0; v[i]<j;++i){
>>   do something;
>> }
>
> If you want to break a specific loop, use labels.
>
> L1:
> 	foreach(i; 0 .. 10) {
> 	
> 	L2:	foreach(j; 0 .. 10) {
> 			// break L1;
>
> 			// break L2;
> 			// or
> 			// break;
> 		}
> 	}

Hey thanks, until now I just used bool variables as break flags.

Is it possible to use foreach backwards?

foreach(int i;20..1)
 writeln(i);

compiles but I get nothing.

On Monday, 19 October 2015 at 15:56:00 UTC, Namal wrote:
> Is it possible to use foreach backwards?
>

yes
http://dlang.org/statement.html#ForeachStatement
http://dpaste.dzfl.pl/cf847a9e1595

On Monday, 19 October 2015 at 15:56:00 UTC, Namal wrote:
> Is it possible to use foreach backwards?
>
> foreach(int i;20..1)
>  writeln(i);
>
> compiles but I get nothing.

foreach_reverse(i; 1 .. 20)
    writeln(i);

Or:

import std.range : iota, retro;
foreach(i; iota(1, 20).retro)
    writeln(i);

But if you really want the numbers 1 to 20, you should use 21 as the end value in both cases, as it's exclusive.

Hello guys,

I remember it is possible to get the index for each element in the foreach loop, but I forgot how to do it. Can you help me out please. Thx.

On Tuesday, 3 November 2015 at 14:47:14 UTC, Namal wrote:
> Hello guys,
>
> I remember it is possible to get the index for each element in the foreach loop, but I forgot how to do it. Can you help me out please. Thx.

auto arr = ["Hello", "World"];

foreach(int idx, string str; arr){
   writefln("%s = %s", idx, str);
}