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filter_map with flat_mapIt works because:
filter_map takes a FnMut(Self::Item) -> Option<B>
flat_map takes a FnMut(Self::Item) -> impl IntoIterator
Option implements IntoIteratorOption implements IntoIterator, which will return an iterator with one item for Some and empty iterator for None
filter_map with flat_mapIt works because:
filter_map takes a FnMut(Self::Item) -> Option<B>
flat_map takes a FnMut(Self::Item) -> impl IntoIterator
Option implements IntoIterator, which will return an iterator with one item for Some and empty iterator for None
filter_map with flat_mapIt works because:
filter_map takes a FnMut(Self::Item) -> Option<B>
flat_map takes a FnMut(Self::Item) -> impl IntoIterator
Option implements IntoIterator, which will return an iterator with one item for Some and empty iterator for None
filter_map with flat_mapIt works because:
filter_map takes a FnMut(Self::Item) -> Option<B>
flat_map takes a FnMut(Self::Item) -> impl IntoIterator
Option implements IntoIterator, which will return an iterator with one item for Some and empty iterator for None