4 levels of Rust error handling

Strengthen your code one level at a time. Rust's errors can be confusing. Learn how to start with an easy path and grow as you knowledge increases. This video was produced first for patrons / timclicks
📚 Resources:
// Docs
- Error Handling in Rust - A Deep Dive www.lpalmieri.com/posts/error...
- Error Handling in Rust with Jane Lasore-Lusby rustacean-station.org/episode...
- Error Handling in Rust (old! this one is how I learned!) blog.burntsushi.net/rust-erro...
// Slides
docs.google.com/presentation/...
// Crates
- crates.io/crates/thiserror
- crates.io/crates/eyre
- crates.io/crates/anyhow
🦀 Rust resources:
- Rust Documentation: doc.rust-lang.org/book/
- Rust Playground: play.rust-lang.org/
- Rust in Action (Tim's book!) mng.bz/4MlD
- How to Learn Rust (online course!) learning.accelerant.dev/how-t...
👋 Connect with Tim:
- Twitter: / timclicks
- GitHub: github.com/timClicks
- Mastodon: mastodon.nz/@timClicks
- DEV: dev.to/timclicks/
- Patreon (extra learning materials) / timclicks
Timeline
00:00:00 Introduction
00:01:04 Personal story about learning Rust error handling
00:04:39 Combing errors
00:05:18 Using std::error:Error trait objects
00:08:20 Programmer's view of an error
00:09:40 Type system's view of an error
00:11:32 What is a Result?
00:14:12 Individual modules/crates often define their own Error types
00:16:15 Level 1: Ignore Results
00:17:10 Using unwrap()
00:18:35 Using expect()
00:19:50 Assigning to underscore (_)
00:24:18 Level 2: Return strings as errors
00:25:15 Converting errors with map_err
00:26:40 Defining a function with String as an error type
00:31:34 Level 3: use enums as errors
00:37:20 Why bother to define a custom error type
00:41:50 Level 4: use crates to help
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👍 Like this video if you found it helpful, and share it with your friends who are also interested in Rust programming.

[@JorgetePanete]

Some video editing to shorten the video would be very useful

[@ekarademir]

Thank you for this video. I just wanted to add, another advantage of using a crate level Error enum is that if you are emitting the errors in different ways, like printing out, or returning as a server response, or pushing into a central system, your extra work would be just implementing conversions to that enum.

[@timClicks]

Excellent point. Thank you for adding your thoughts.

[@agustindiaz3361]

This is awesome! This kind of high quality, advanced topics in rust is really absent in youtube. Thanks for sharing it :D

[@pyprem]

There is some confusion at 25:17. However, to make this idea work you can do it like this: `.map_err(|_err| "could not create file")?;`, i.e. `map_err` returns the value contained in the Err variant, not the whole variant itself.

[@nubunto]

came here to say this. there's a confusion between the Result type and the Err variant, which is common!

[@bakhtiyargarashov805]

Going through the Rust learning journey with you is amazing. Thanks for that.

[@nscheer]

Really enjoyed your content! One thing: The video would be way nicer to watch without all the „ehem“ and „aahmm“ - it is worth it to train and let there be just some silence between the words 😊

[@timClicks]

Thanks for the advice. You'll find that more recent videos of mine are much more polished

[@pmcgee003]

unwrap .. because Result should be understood as a functor / monad

[@mustafazakiassagaf1757]

hey it would be nice if you provide timestamps for longer video like this. other than that this is a good video with good story telling 💪

[@timClicks]

Done :)

[@user-kr9on5rw6q]

Привет я на этом канале сново увидел шедевр это видео прекрасно как и остальные