Rust Essentials by Balbaert Ivo

Author:Balbaert, Ivo [Balbaert, Ivo]
Language: eng
Format: azw3, epub, pdf
Publisher: Packt Publishing
Published: 2015-05-26T16:00:00+00:00

It again shows Rust's commitment to be on the safe side; if it's Ok, it will give back a value of the T type, if there is a problem, then it will give back the error that will be a value of the E type (which is usually an error message string). So, we could read them also as Ok(what) and Err(why), where what has the T type and why has the E type.

So, why are Option and Result killer features of Rust? Remember from Chapter 4, Structuring Data and Matching Patterns in the section Result and Option how we used Option when getting a number input? Here, it is given again:

let input_num: Result<u32, _> = buf.trim().parse();

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