Is there any generic iteration function that stops at first match?

[mipri]

On Friday, 5 March 2021 at 05:32:27 UTC, Jack wrote:
> On Friday, 5 March 2021 at 02:43:36 UTC, H. S. Teoh wrote:
>> On Fri, Mar 05, 2021 at 02:13:39AM +0000, Jack via 
>> Digitalmars-d-learn wrote:
>>> something like filter[1] but that stops at first match? are 
>>> there any native functions for this in D or I have to write 
>>> one? just making sure to not reinvent the wheel
>> [...]
>>
>> Why not just .front?  E.g.:
>>
>> 	int[] data = [ 1,2,3,4,5 ];
>> 	auto r = data.filter!(v => v % 2 == 0);
>> 	assert(r.front == 2);
>>
>>
>> T
>
> it loops over the entire array then returns, I'd like to stop 
> as soon as the predicate return true

   void main() {
       import std.stdio, std.algorithm, std.range;
       int[] data = iota(5).map!"a+1".array;
       auto r = data.filter!(function (v) { writeln(v); return v % 
2 == 0; });
       assert(r.front == 2);
   }

output:

   1
   2

'r' is an iterator. To force it to loop over the entire array that
would need a .array like I'm using for 'data'.