How do I avoid unwrap when converting a vector of Options or Results to only the successful values?

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I want to ignore all Err values

Since Result implements IntoIterator, you can convert your Vec into an iterator (which will be an iterator of iterators) and then flatten it:

These methods also work for Option, which also implements IntoIterator.

You could also convert the Result into an Option and use Iterator::filter_map:

vec.into_iter().filter_map(|e| e.ok()).collect()

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