rust fun

playground.rs

fn main() {
    println!("Hello, world!");
    // fixed sized array
    let arr1 : [i32; 4] = [3, 23, 4, 2];
    println!("first element of array {}", arr1[0]);
    println!("the array is {} long", arr1.len());
    
    let xs: [i64; 2] = [1, 3];
    // Arrays are stack allocated.
    println!("Array occupies {} bytes", std::mem::size_of_val(&xs));
    
    
    let large_array: [i128; 2000] = [0; 2000];
    println!("the large array is {} bytes", std::mem::size_of_val(&large_array));
    println!("the count of large array is {} items", large_array.len());
    
    let mut baby_vector: Vec<i32> = vec![3,2,5];
    println!("baby vector is {} items", baby_vector.len());
    baby_vector.push(32);
    
    let mut new_vector: Vec<i32> = Vec::new();
    
    new_vector.push(252);
    new_vector.push(338);
    
    println!("New vector mutable array of type integer 32 bit is now {:?}", &new_vector);
    
    let names: [&str; 3] = ["Fatima", "Tal", "Mayumi"];
    
    println!("names {:?}", &names);
    
    // can you put string immutable string slices in the heap?
    let mut vector_names: Vec<&str> = Vec::new();
    vector_names.push("Fatima");
    
    println!("the vector names are {:?}", vector_names);
    
    vector_names.push("Tal");
    
    for element in &names {
        vector_names.push(*element);
    }
    
    println!("The vectors names are {:?}", vector_names);
    println!("The arraynames are {:?}!", names);
    
    let mut names: Vec<String> = Vec::new();
    names.push("Fatima".to_string());
}