The filter_map explanation is wrong. .ok() converts a result to an Option, not a boolean. Likewise, filter_map expects an option. That's how it can both filter

The filter_map explanation is wrong. .ok() converts a result to an Option, not a boolean. Likewise, filter_map expects an option. That's how it can both filter and map. Docs: https://doc.rust-lang.org/std/result/enum.Result.html#method.ok https://doc.rust-lang.org/std/result/enum.Result.html#method...