Learning Rust as a embedded C programmer

Intro

C 에서 Rust 로 main 언어로 사용하기 위한 여정: My journey to be a Rustacean 🦀

Good reasons for C Programmers

• one-stop package & build system
• test built-in support, easy TDD
• memory safe coding
• compiler driven development
• dev community
• documentations
• modern programming concepts
• wide range from embedded to web

Basic concepts

• statements and expressions
  • statements
    • serve mostly to contain and explicitly sequence expression evaluation : does not return, followed by ;
      • declaration statements
      • expression statements
  • expressions
    • it always produces a value, and it may have effects : returns a value
    • evaluates to a value, and has effects during evaluation
• ownership
  • the main purpose of ownership is to manage heap data
  • rules
  • Each value in Rust has an owner.
  • There can only be one owner at a time.
  • When the owner goes out of scope, the value will be dropped.
• reference
  • like a pointer in that it’s an address we can follow to access the data stored at that address
  • rules
    • 1 mutable reference or N immutable references.
    • always be valid.
• borrowing
  • the action of creating a reference
  • borrow checker
    • compares scopes to determine whether all borrows are valid
• enum
  • give you a way of saying a value is one of a possible set of values
  • can have associated values
• pattern matching
  • patterns : Literals, Destructured arrays, enums, structs, or tuples, variables, wildcards, placeholders
  • matching : compare it to some value. If the pattern matches, use the value parts in our code
• generics
  • abstract stand-ins for concrete types or other properties
    • concrete type (i32, f32, String ...)
    • generic types
      • Option
      • Result<T, E>
      • Vec
      • HashMap<K, V>
  • monomorphization
    • turning generic code into specific code by filling in the concrete types that are used when compiled
• trait
  • defines functionality a particular type has and can share with other types (shared behavier, like interface)
• lifetime
  • another kind of generic
  • ensure that references are valid as long as we need them to be
• functional programming
  • style
    • using functions as values by passing them in arguments,
      returning them from other functions, assigning them to variables for later execution
  • closure
    • a function-like construct you can store in a variable
  • iterator
    • a way of processing a series of elements
• smart pointers
  • pointer
    • general concept for a variable that contains an address in memory
  • smart pointer
    • data structures that act like a pointer but also have additional metadata and capabilities
  • deref coercion
    • converts a reference to a type that implements the Deref trait into a reference to another type
  • Interior mutability
    • a mutable borrow to an immutable value
  • common smart pointers
    • Box for allocating values on the heap
    • Rc, a reference counting type that enables multiple ownership
    • Ref, RefMut, accessed through RefCell,
      a type that enforces the borrowing rules at runtime instead of compile time

Learning

Step 1 : Rust fundamental (syntax & idioms)

• The book
  • The book community 번역 버젼 (https://rinthel.github.io/rust-lang-book-ko/)
    • 챕터별로 번역 스타일이 다르고 가독성이 떨어짐 (22.05.19)
  • The book 한글판 : [러스트 프로그래밍 공식 가이드] (https://www.aladin.co.kr/shop/wproduct.aspx?ItemId=216867525)
    • 전반적으로 번역이 좋다. 영어로 그대로 두어도 괜찮은 것들은 두면 좋겠다.
• Easy Rust : Rust를 배웁시다. (Kor/Eng) by David MacLeod
  • Easy Rust Korean / 한국어판 강의
    • 정렬된 강의 비디오 리스트 TOC of Easy Rust
  • Easy Rust Book

Step 2 : Coding Practice

muscle memory building(actually it doensnt have memory though)
어느 정도 코딩할 수 있을 정도 지식이 생기면, 코딩 하면서 부족한 부분을 명확히 인지하게 되고 그 부분을 관련 자료 찾아 공부

• Rustlings : 조금 쉬운 편 (22.05.20) https://github.com/rust-lang/rustlings

• Exercism : Online learning how to coding platform (코딩 인터뷰용이라기 보단, 교육적 목적 for free)
  https://exercism.org/tracks/rust
  Solve coding exercises and get mentored to gain true fluency in your chosen programming languages.
  Web에서 문제를 풀어볼 수 있지만, WORK LOCALLY 방식으로 IDE의 도움받아서 코딩하는 것이 좋고, Test Case를 통해 힌트를 얻고 test 작성법을 배울 수 있다.

  

• Coding Quiz(Leetcode 류의 문제) : 연습량 늘리기 /practice/training/

Step 3 : Rust intermediate

Zero 2 Production in RUST

• Auth Web Microservice with rust using Actix-Web 4.0
• Book : Zero To Production

• Actix 로 Back-end 만드는 과정, 최근에 Update 되었고, 책을 쓴 이유 중 하나가 새로 오는 팀원들을 위해 썼다고 한다. 그래서, 초보용 책은 아니지만, 세심하게 배려했다고 서문과 리뷰에 언급되어 있어 안심하고 구매(했지만, 어렵다.)

Step 4 : Learning by doing some projects

useful, big idea, start small 만들자 무언가 (생각나는 대로 적어 보고, 점차 구체화 할 것)

• Quant Stock Trading
  • Stock Trading SDK + Trader App (한국투자증권 KIS API)
    https://github.com/goodsw4all/KIS_OpenAPI_in_Rust
• GUI App
  • Metronome
• 공공 Data API 를 활용해서 sth?
• Linux Kernel Module
• 기존의 C(or any others)로 된 것을 rewrite
• 번역
  • rust by example
    https://goodsw4all.github.io/rust-by-example-ko/index.html

My own q/a

References

syntax

• Iterator
  https://www.newline.co/@uint/rust-iterators-a-guide
• Smart pointers