How to implement filterMap

[Christian Köstlin]

On Saturday, 30 December 2023 at 01:22:31 UTC, Siarhei Siamashka 
wrote:
> On Friday, 29 December 2023 at 23:10:47 UTC, Christian Köstlin 
> wrote:
>> Is there a way to implement filterMap (meaning do mapping of a 
>> range, but if something happens during the map, leave this 
>> element out of the resulting range).
>
> It's probably not a good idea to do this in general. Expecting 
> a lot of exceptions handling happening during normal program 
> execution (if you want to filter out roughly half of the input 
> array) will result in a major performance loss. Exceptions are 
> best left to just do error handling on a very rarely used code 
> path for troubleshooting purposes.
Thanks for the feedback.

This might be true, but in my example I would parse the input 
always with conv.to, so I would need to handle the exception(s).
The "original" 
https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.filter_map works with the Option(Some/None) ...

Kind regards,
Christian