Bool and Unit Primitives

Bool และ Unit types

bool Type

fn main() {
    // Boolean values
    let is_active = true;
    let is_complete = false;

    println!("active: {}, complete: {}", is_active, is_complete);

    // From comparison
    let x = 10;
    let is_positive = x > 0;
    let is_even = x % 2 == 0;

    println!("positive: {}, even: {}", is_positive, is_even);

    // Boolean operations
    let a = true;
    let b = false;

    println!("\n=== Logical Operations ===");
    println!("a && b = {}", a && b);  // AND
    println!("a || b = {}", a || b);  // OR
    println!("!a = {}", !a);          // NOT
    println!("a ^ b = {}", a ^ b);    // XOR

    // Short-circuit evaluation
    fn check() -> bool {
        println!("check() called");
        true
    }

    println!("\n=== Short-circuit ===");
    let _ = false && check();  // check() not called
    let _ = true || check();   // check() not called

    // then / then_some
    println!("\n=== then methods ===");
    let result = is_active.then(|| "Active!");
    println!("then: {:?}", result);

    let result = is_complete.then_some("Complete");
    println!("then_some: {:?}", result);
}