Slice Primitives

Slice type [T] และ operations

Creating Slices

fn main() {
    // Slice from array
    let arr = [1, 2, 3, 4, 5];
    let slice: &[i32] = &arr[1..4];
    println!("Slice [1..4]: {:?}", slice);

    // Full slice
    let full: &[i32] = &arr[..];
    println!("Full slice: {:?}", full);

    // From start
    let from_start: &[i32] = &arr[..3];
    println!("From start: {:?}", from_start);

    // To end
    let to_end: &[i32] = &arr[2..];
    println!("To end: {:?}", to_end);

    // Slice from Vec
    let vec = vec![10, 20, 30, 40, 50];
    let slice: &[i32] = &vec[1..4];
    println!("Vec slice: {:?}", slice);

    // Mutable slice
    let mut arr = [1, 2, 3, 4, 5];
    let slice: &mut [i32] = &mut arr[1..4];
    slice[0] = 20;
    println!("Modified: {:?}", arr);

    // Empty slice
    let empty: &[i32] = &[];
    println!("Empty: {:?}, len: {}", empty, empty.len());

    // Slice is DST (Dynamically Sized Type)
    println!("\nSize of &[i32]: {} bytes (fat pointer)",
        std::mem::size_of::<&[i32]>());
}