This article is mainly focused for those developers who haven’t tried Rust yet or they are starting to play with it.
It has been written after 3 days playing with Rust .So please… don’t be so hard with me! I’m a beginner & self-though guy that just wants to share with others what is learning!
About this article
In this article we will build a program that retrieves a csv file as input (available shows in Netflix) and it performs some queries to the dataset.
In addition to this, I’ll go through the most interesting things that I’ve learnt these days; you will also find some useful links.
Because I want to do some researches on IoT. Embedded systems can be programmed with Rust easily.
Setup the environment
It’s very straightforward, just follow the below links:
Basically Cargo is the Rust packages manger. Cargo is for Rust like Maven is for Java, Npm for Node. or sbt for Scala
There’s a Cargo.toml in the root of any Rust project. This file could look like this:
We could have several executables programs, and they must be defined in the bin section. Have a look at the below link to know about how cargo works.
Objects are defined with keyword struct. By default, the structs and attributes visibility is private. To make them public we just need to set the keyword pub.
Methods: Methods implementations are in an impl block.
- Each statement ends with semicolon. If the last statement in a function doesn’t end with semicolon, it will be interpreted like the return of the function. The both following examples are the same.
- self keyword permits access to the object attributes and methods.
- By default, the variables are inmutables. To make them mutables we need to use the keyword mut.
Types: We can easily define new types (or alias)
Traits: Similar to interfaces in some points, but they provides extra functionality.
The traits contains the signature of the methods to be implemented. On the other hand default implementation can be defined in the trait.
On the other hand, we can also provide traits implementations for existing types.
Generics: Generics are supported in Rust (Golang… you’re so late). This permits as build more reusable code. The last example in section Traits contains a use case.
We can import modules by making use of keyword use. Syntax to import modules in Rust is powerful
Writing our own business error is useful to write code easy to read. To do this, we just need to implement the traits Display and Error for our struct.
Closures in Rust, also called lambda expressions or lambdas, are functions that can capture the enclosing environment. For example, a closure that captures the x variable:
As in many other languages you’ll find several articles about which one is the best way to organize a rust project.
I haven’t done any research on this yet, but It’s something that I want to try as soon as possible. I guess It works like in other languages such as Elixir or Ruby.
Meta programming is so powerful.
Rust provides Higher Order Functions (HOF). These are functions that take one or more functions and/or produce a more useful function. HOFs and lazy iterators give Rust its functional flavor
The code of the program can be cloned from here
Clone the repository and once the Rust environment is ready jrun the below command
cargo run resources/nextflix.csv
The output should be:
I encourage you to implement JSonLoader or XMLLoader to put in practice what you learnt in this article. Code can be easily extensible.
- Documentation of crate serde (used to serialize the domain) can be found here https://serde.rs/
What can you do next?
Books & articles are fine to get an idea about technology, but actually you only learn if you put it into practice what you read.
- Create a new executable file. (Modify Cargo.toml and create a new file in bin directory)
cargo run — bin mydemo resources/nextflix.csv
- Print the title (in uppercase) of the shows whose release date is lees than 3 years.(and any other query that you want to try).
- Code an implementation for loading the file netflix.json in resources directory. The command should be
cargo run resources/nextflix.json
Must read articles & tutorials
Rust looks so great and It provides excellent mechanisms to build Software. I wish I could learn fast and being able to go through the embedded programming tutorials soon.
Even the documentation is so great, and the language takes the best of several programming languages, I’m afraid its success will depend on how many frameworks to build commercial Software appear in upcoming years.
Sadly the Rust community is not so big, and to be honest, I don’t know companies which want to bet for this kind of challenges…