I'm thinking about just using this crate ITER-OPT-FILTER.
https://github.com/ottermata/iter-opt-filter/.
But this seems to me that something that should already exist? Am i missing sometthing in itertools?
#Is there a clean way of doing optional filter to iterators?
crystal geode
To clarify: The crate can make filters optional. Ex: If a value you want to filter on is None. The filter does nothing.
sleek monolith
If you have a bool b that determines if the filter is enabled, you can just do
.filter(|i| !b || condition(i))
```The only issue with this is that it may fail to optimize out redundant checks on `b` if the loop is complex. You can get around that by making a custom type like that crate does, but the crate only goes halfway and doesn't override `try_fold`, so it's not any better than the code above in most circumstances.hmmm...
The loop will often often contain None values that i dont want to filter on. I guess optimizing for speed isn't critical.
But am I wrong in thinking that this should just be a feature?
I want to suggest it for either itertools or just rust.
This is used a lot and can be heavily optimized
sleek monolith
There's no need for this to be in the standard library since it's fully implementable in user code. Itertools might add it, but you should just make it yourself.