Function rust_examples::collect::read_files

pub fn read_files<P: AsRef<Path>>(paths: &[P]) -> Result<Vec<String>>

Traversing a Result works analogously to an Option since a result is basically an option where the None case is some more specific type.

Other languages typically implement a general .traverse(f) method, so it might seem that collect is not as expressive (it’s equivalent to .sequence). However, .traverse(f) is equivalent to .map(f).sequence. See the reference to Typelevel Cats for more.

Note that std::io::Result is just ordinary result with io error Result<T, std::io::Error>.