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Topics

Rust Basics

Introduction to RustInstalling RustRust SyntaxRust VariablesRust Data TypesRust ConstantsRust FunctionsRust CommentsRust OperatorsRust Control Flow

Ownership and Borrowing

Rust Ownership ConceptRust ReferencesRust Borrowing RulesRust LifetimesRust Move SemanticsRust Copy Types

Rust Structs and Enums

Rust StructsRust MethodsRust Associated FunctionsRust EnumsRust Pattern MatchingRust Option EnumRust Result Enum

Rust Collections

Rust VectorsRust StringsRust Hash MapsRust ArraysRust SlicesRust Iterators

Rust Error Handling

Rust Panic!Rust Result<T, E>Rust Propagating ErrorsRust Custom Error TypesRust Unwrap and Expect

Rust Generics and Traits

Rust Generic TypesRust Generic FunctionsRust Trait DefinitionsRust Trait ImplementationsRust Trait BoundsRust Associated Types

Rust Modules and Packages

Rust Module SystemRust CratesRust WorkspacesRust Use KeywordRust Visibility RulesRust External Dependencies

Rust Concurrency

Rust ThreadsRust Message PassingRust Shared StateRust Sync and Send TraitsRust Atomic TypesRust Mutex and RwLock

Rust Advanced Topics

Rust Unsafe CodeRust Advanced TraitsRust Advanced TypesRust MacrosRust FFI (Foreign Function Interface)Rust Asynchronous Programming

Rust Testing and Documentation

Rust Unit TestsRust Integration TestsRust Documentation TestsRust Benchmark TestsRust Documentation Comments

Rust Ecosystem

Rust Cargo Package ManagerRust Standard LibraryRust Community and ResourcesRust Popular CratesRust Web DevelopmentRust Systems Programming

Control Flow in Rust

Control flow is a fundamental concept in Rust programming. It allows developers to direct the execution path of their code based on conditions and repetitions. Understanding control flow is crucial for writing efficient and logical Rust programs.

If Statements

If statements in Rust enable conditional execution of code blocks. They evaluate a boolean expression and execute the corresponding block if the condition is true.


let number = 5;

if number < 10 {
    println!("The number is less than 10");
} else if number == 10 {
    println!("The number is exactly 10");
} else {
    println!("The number is greater than 10");
}

Loops

Rust provides several types of loops for repetitive tasks:

1. loop

The loop keyword creates an infinite loop that can be broken using the break statement.


let mut counter = 0;

loop {
    println!("Counter: {}", counter);
    counter += 1;
    if counter == 5 {
        break;
    }
}

2. while

While loops continue executing as long as a condition remains true.


let mut number = 3;

while number != 0 {
    println!("{}!", number);
    number -= 1;
}

println!("LIFTOFF!!!");

3. for

For loops iterate over elements in a collection or a range.


for number in (1..4).rev() {
    println!("{}!", number);
}
println!("LIFTOFF!!!");

Pattern Matching with match

The match expression in Rust provides powerful pattern matching capabilities. It's similar to a switch statement in other languages but offers more flexibility and safety.


let dice_roll = 3;

match dice_roll {
    3 => println!("You rolled a three!"),
    7 => println!("Lucky seven!"),
    _ => println!("You rolled something else"),
}

Important Considerations

  • Rust's if statements don't require parentheses around the condition.
  • The condition in an if statement must be a boolean expression.
  • Use break to exit a loop early and continue to skip to the next iteration.
  • The match expression must be exhaustive, covering all possible cases.

Mastering control flow is essential for writing efficient Rust code. It allows you to create more complex and dynamic programs. As you progress, you'll find these concepts integrating seamlessly with other Rust features like ownership and pattern matching.

For more advanced control flow techniques, explore iterators and Result enum for error handling. These concepts build upon the foundational control flow structures and provide more sophisticated ways to manage program execution in Rust.