Answer by nikoss for Idiomatic way to only get insides of `Some` from a vector of options?

In your case since you are not doing any mapping, I would suggest using flattening instead of filter_maping.Which in my opinion is much clearer and more self explanatory.

    let optvec = vec![Some(1), None, Some(4), None];    let filtered: Vec<i32> = optvec.iter().flatten().cloned().collect();    assert_eq!(filtered, &[1, 4]);