Rust Programming Language Other Meetups, 10 May 2022

Previous Meeting

Next Meeting

⏯

youtube image

►

From YouTube: Lightning talk ⚡️: rustlings, Juha-Matti Santala | Rust Finland 9.5.2022 @ Futurice

Description

rustlings (https://github.com/rust-lang/rustlings) is a wonderful project that helps you learn Rust by giving you small pieces of code which don't compile, exposing you to the compiler errors. Your job then is to fix those errors and make the code compile.

This lightning talk by Juhis was recorded at Rust Finland meetup 9.5.2022 hosted by Futurice.

Juhis: https://hamatti.org | https://twitter.com/hamatti
Rust Finland: https://www.meetup.com/Finland-Rust-Meetup/
Futurice: https://futurice.com/devbreakfast

A

All right so, like we heard this morning, we woke up to the message that one of the speakers couldn't come, so I volunteered to do like a really quick, lightning talk and during the day it kind of evolved, so we're gonna do a live programming session in an ensemble programming style. So if there's mistakes, they are not mine, but yours, so I will be just the typist and you will tell me what to do.

A

But what I'm going to talk about is these grasslands and the other reason why I wanted to do this. Talk today is leading into this event. I talked with a lot of people who were kind of interested in the meet up, but they felt that I'm not good enough. I'm not experienced enough with trust. I clearly cannot come and I hope that we managed to convince at least some of those people to join.

A

I think meetups are a really great place to get involved with the new technology. Learn about from the dogs from the people see what kind of technology you're dealing with and rustling is one of those projects that is really good for beginners.

A

I also realized I didn't properly introduce myself when I was here earlier. I was more concerned about the youtube, so my name is yuis. I work at futurist as a developer and forget basically doing this. I I run a lot of meetups with a lot of different communities, different technologies.

A

I travel a bit all across europe for different events, conferences, meetups and I started learning rusk roughly like a year and a half ago.

A

I first got interested in 2019 at estonia when john gave a talk about rust with python, and then I started following the rask community and immediately a year later, I I started coding with rust I and in 2021 I built a small command line tool to get nhl results into the terminal, and I wrote the block series of me learning rust.

A

As somebody coming from javascript and python background, you can find out that I'm a tito torx lasso rust, but one of the things I learned during that is a project called rasclinks.

A

How many of you are familiar with the project before about maybe one third awesome.

A

Rostlings is a a project that helps you learn rust, but it does it in a really interesting ah way, basically gives you exercises where the compiler doesn't compile and you need to fix them.

A

uh Closure has a little bit similar. I think it's closure katan or something like that. Oh they have tests that fail and you need to fix the code to get the tests pass, but I really like the approach by rustling, because first of all the compiler is super nice in rust.

A

I think it's more of a advice to you, rather than the usual complaining about what you do, and I think that in any kind of language learning how to deal with error messages is so valuable because that, if you become good with those, you can start debugging and solving any issues that you get so rustlings is a command line tool. That looks like this when you run it first time and now I want to show you how it actually functions.

A

So I've installed raspbians on the newest version.

A

And if I run rustling's watch, it's gonna try to compile the first exercise, the first one compiles successfully, it outputs something, and then it says when you're done with this exercise, delete the comment. I am not done so if we jump into him.

A

And if I delete this file and jump back, it should go. I need to save.

A

It should reload, and now it says it successfully run intro one and then it says we tried to compile. Intro too you get the actual error input for the output from the compiler, and now your job is to fix this.

A

The thing is that rustlings doesn't really teach you how to do any of these things, so you need the rust book or some other kind of complimentary materials, while you're learning. So if we open intro to.

A

So we get this, this error message that we have one positional argument in format string, but no arguments were given.

A

What should I do any ideas.

A

A

Awesome so we go to line 8 and we say rust, finland. Now, if I save it, it gets run and if we did it correctly, it says good it works you can delete. I am not done.

A

And we get to the next one. I won't be going through all of this with you today, but I just want to show what the kind of workflow is so now it says that in the variables variables one something went wrong, so it cannot find the value x in this scope.

A

Let's open variables variables one any ideas: what should we do to introduce x to the scope.

A

So online we should say beautiful x and we can try that out.

A

Then I need to scroll down all right that helped us now. It tells us what we need to do so that was a good first step. So if we add lead- and we run it.

A

It is successful and then we delete the. I am not done so. The thing with rustlings is that it really helps you get kind of step by step help you learn what their messages are, what they mean, and they have quite a good kind of selection.

A

Of topics, so if we take a look at the folders in the exercises, you learn about variables, functions, generics, macros, all sorts of things, and this is open source. So, if you feel you want to contribute make a new exercise, you can do that.

A

So if you have never tried grasslands, especially if you're in your like first year of rust, I highly recommend taking a look. I found it at like four or five months in and it was super helpful. I wish I learned it at the beginning and I really really want to emphasize how much I enjoy this idea that you get real, live error messages and then you need to fix them. So you learn two valuable skills. At the same time,.