Add Chapter 2: Exploring Rust Basics #188
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WalkthroughThis pull request introduces a new chapter (Chapter 2) in a book compendium focusing on Rust programming basics. The chapter includes four files: a README and three Rust source files ( Changes
Sequence DiagramsequenceDiagram
participant Main as main()
participant TakeOwnership as take_ownership()
Main->>Main: Create String "Hello, Ownership!"
Main->>TakeOwnership: Transfer string ownership
TakeOwnership-->>TakeOwnership: Print string
TakeOwnership--xMain: Original string no longer valid
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Actionable comments posted: 1
🧹 Nitpick comments (4)
book-compendium/chapter-2/varibles.rs (1)
1-9: Consider enhancing the educational value with more detailed commentsWhile the code effectively demonstrates variable mutability, consider adding more detailed comments to better explain the concepts for learners. This could include:
- Why Rust defaults to immutable variables
- When to use mutable variables
- Best practices around mutability
Here's a suggested enhancement:
fn main() { - let x = 5; // Immutable variable + // By default, variables in Rust are immutable (cannot be changed) + // This promotes safer and more predictable code + let x = 5; println!("x = {}", x); - let mut y = 10; // Mutable variable + // Use 'mut' keyword when you need to change a variable's value + // Only use mutable variables when necessary + let mut y = 10; println!("y before mutation = {}", y); y = 15; println!("y after mutation = {}", y); }book-compendium/chapter-2/control_flow.rs (1)
1-13: Add educational comments and expand examplesWhile the code is correct, consider enhancing its educational value:
- Add explanatory comments for each control flow construct
- Use inclusive range syntax
0..=4instead of0..5to demonstrate Rust's range operators- Consider adding more control flow examples like:
whileloopsmatchexpressionsloopwithbreakandcontinueHere's a suggested enhancement:
+// Example of basic control flow in Rust fn main() { + // If-else demonstration let number = 7; if number < 10 { println!("Number is less than 10"); } else { println!("Number is greater than or equal to 10"); } + // For loop demonstration with inclusive range - for i in 0..5 { + for i in 0..=4 { println!("Value of i: {}", i); } + + // While loop demonstration + let mut count = 0; + while count < 3 { + println!("Count: {}", count); + count += 1; + } + + // Match expression demonstration + match number { + 0 => println!("Zero"), + 1..=9 => println!("Single digit"), + _ => println!("Multiple digits"), + } }book-compendium/chapter-2/ownership.rs (1)
1-12: Expand ownership examples for better learningWhile the code correctly demonstrates ownership transfer, consider adding more comprehensive examples to better illustrate Rust's ownership concepts:
- Add examples of borrowing with
&and&mut- Demonstrate ownership return patterns
- Show difference between Copy and Move types
Here's a suggested enhancement:
fn main() { + // Ownership transfer example let s = String::from("Hello, Ownership!"); take_ownership(s); - // Uncommenting the line below will cause an error, as `s` is no longer valid. - // println!("{}", s); + // println!("{}", s); // Error: value borrowed here after move + + // Borrowing example + let s2 = String::from("Hello, Borrowing!"); + borrow_string(&s2); // Passing reference instead of ownership + println!("Can still use s2: {}", s2); // Works fine + + // Mutable borrowing + let mut s3 = String::from("Hello, "); + modify_string(&mut s3); + println!("Modified string: {}", s3); + + // Copy type example + let x = 5; + makes_copy(x); + println!("Can still use x: {}", x); // Works fine, i32 implements Copy } fn take_ownership(some_string: String) { println!("{}", some_string); } + +fn borrow_string(some_string: &String) { + println!("{}", some_string); +} + +fn modify_string(some_string: &mut String) { + some_string.push_str("Mutable!"); +} + +fn makes_copy(some_integer: i32) { + println!("{}", some_integer); +}book-compendium/chapter-2/README.md (1)
1-7: Enhance README with more detailed contentWhile the structure is clear, consider enhancing the educational value:
- Add learning objectives at the start
- Include brief code snippets for each concept
- Add explanations of key concepts
- Link to Rust documentation for further reading
Here's a suggested enhancement:
# Chapter 2: Exploring Rust Basics -This chapter introduces key Rust concepts with simple examples. +## Learning Objectives + +After completing this chapter, you will understand: +- How Rust's variable system ensures memory safety +- Basic control flow constructs in Rust +- Rust's unique ownership system + +## Contents + +### 1. Variables (`variables.rs`) +Demonstrates variables, immutability, and mutability in Rust. + +```rust +let x = 5; // immutable by default +let mut y = 1; // mutable variable +y += 1; // can modify mutable variables +``` + +### 2. Control Flow (`control_flow.rs`) +Explains basic control flow constructs like `if-else` and loops. + +```rust +// Example if-else +if number < 10 { + println!("Less than 10"); +} + +// Example for loop +for i in 0..5 { + println!("Value: {}", i); +} +``` + +### 3. Ownership (`ownership.rs`) +Introduces Rust's ownership model and function interactions. + +```rust +let s = String::from("hello"); +takes_ownership(s); // ownership transferred +// s is no longer valid here +``` + +## Further Reading +- [Rust Book: Variables and Mutability](https://doc.rust-lang.org/book/ch03-01-variables-and-mutability.html) +- [Rust Book: Control Flow](https://doc.rust-lang.org/book/ch03-05-control-flow.html) +- [Rust Book: Understanding Ownership](https://doc.rust-lang.org/book/ch04-01-what-is-ownership.html)🧰 Tools
🪛 LanguageTool
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Context: ...bility in Rust. 2.control_flow.rs: Explains basic control flow constructs ...(UNLIKELY_OPENING_PUNCTUATION)
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Context: ...f-elseand loops. 3. **ownership.rs`**: Introduces Rust's ownership model and f...(UNLIKELY_OPENING_PUNCTUATION)
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📒 Files selected for processing (4)
book-compendium/chapter-2/README.md(1 hunks)book-compendium/chapter-2/control_flow.rs(1 hunks)book-compendium/chapter-2/ownership.rs(1 hunks)book-compendium/chapter-2/varibles.rs(1 hunks)
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book-compendium/chapter-2/README.md
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🔇 Additional comments (1)
book-compendium/chapter-2/varibles.rs (1)
2-3: Good demonstration of variable behavior
The code effectively shows the contrast between immutable and mutable variables through clear examples and appropriate print statements. The progression from immutable to mutable variables helps learners understand the concepts step by step.
Also applies to: 5-8
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Fixed the typo |
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Actionable comments posted: 2
🧹 Nitpick comments (3)
book-compendium/chapter-2/varible.rs (2)
2-4: Enhance the immutable variable example with type annotationWhile the current example is correct, it could be more educational by explicitly showing type annotation.
- let x = 5; // Immutable variable + let x: i32 = 5; // Immutable variable (32-bit integer) println!("x = {}", x);
5-9: Add explanatory comments about mutabilityConsider adding more detailed comments to explain the concept of mutability for educational purposes.
- let mut y = 10; // Mutable variable + // The 'mut' keyword allows us to change the value of y later + let mut y = 10; println!("y before mutation = {}", y); y = 15; println!("y after mutation = {}", y);book-compendium/chapter-2/README.md (1)
1-4: Enhance the chapter introductionThe introduction could be more detailed to better set expectations for learners.
# Chapter 2: Exploring Rust Basics -This chapter introduces key Rust concepts with simple examples. +This chapter introduces fundamental Rust programming concepts through practical examples. Each example is designed to demonstrate a specific aspect of the language, helping you build a strong foundation in Rust programming.
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📒 Files selected for processing (2)
book-compendium/chapter-2/README.md(1 hunks)book-compendium/chapter-2/varible.rs(1 hunks)
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book-compendium/chapter-2/README.md
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| fn main() { | ||
| let x = 5; // Immutable variable | ||
| println!("x = {}", x); | ||
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| let mut y = 10; // Mutable variable | ||
| println!("y before mutation = {}", y); | ||
| y = 15; | ||
| println!("y after mutation = {}", y); | ||
| } |
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Fix the filename typo: "varible.rs" → "variable.rs"
The filename contains a typo which should be corrected to maintain consistency with the README and ensure clarity for learners.
| 1. **`variable.rs`**: Demonstrates variables, immutability, and mutability in Rust. | ||
| 2. **`control_flow.rs`**: Explains basic control flow constructs like `if-else` and loops. | ||
| 3. **`ownership.rs`**: Introduces Rust's ownership model and function interactions. |
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🛠️ Refactor suggestion
Update filename reference and add more details about each example
The README references "variable.rs" but the actual file is "varible.rs" (which should be fixed). Also, consider adding more details about what each example demonstrates.
-1. **`variable.rs`**: Demonstrates variables, immutability, and mutability in Rust.
-2. **`control_flow.rs`**: Explains basic control flow constructs like `if-else` and loops.
-3. **`ownership.rs`**: Introduces Rust's ownership model and function interactions.
+1. **`variable.rs`**: Demonstrates variables in Rust, covering:
+ - Immutable variables (default in Rust)
+ - Mutable variables using the `mut` keyword
+ - Type inference and explicit type annotations
+
+2. **`control_flow.rs`**: Explains basic control flow constructs including:
+ - Conditional statements (`if`-`else`)
+ - Different types of loops
+ - Early return and break statements
+
+3. **`ownership.rs`**: Introduces Rust's unique ownership system:
+ - Understanding ownership rules
+ - Move semantics
+ - Function parameter ownershipCommittable suggestion skipped: line range outside the PR's diff.
🧰 Tools
🪛 LanguageTool
[uncategorized] ~5-~5: Loose punctuation mark.
Context: ...h simple examples. 1. variable.rs: Demonstrates variables, immutability, a...
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Context: ...bility in Rust. 2. control_flow.rs: Explains basic control flow constructs ...
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Context: ...f-else and loops. 3. **ownership.rs`**: Introduces Rust's ownership model and f...
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Description
This pull request adds Chapter 2 to the
book-compendiumsection of the repository. It includes the following examples:variables.rs: Demonstrates variable immutability and mutability in Rust.control_flow.rs: Explains basic control flow constructs likeif-elseand loops.ownership.rs: Introduces Rust's ownership model and function interactions.Summary by CodeRabbit
New Features
Bug Fixes
varible.rstovariable.rsfor consistency.