rust_vector_manipulation.rs

fn main() {
    vector_1();
    vector_2();
    vector_3();
    vector_4();
    vector_5();
    vector_6();
}

fn vector_1() {
    println!("=========== vector_1 ===========");
    let mut v = vec![1, 2, 3, 4, 5];
    for i in &v {
        println!("{}", i);
    }
    println!("---------------------");
    v.push(6);
    for i in &v {
        println!("{}", i);
    }
}

fn vector_2() {
    println!("=========== vector_2 ===========");
    let v = vec![1, 2, 3, 4, 5];
    for i in v {
        println!("{}", i);
    }
    // uncommenting following lines will produce compile errors.
    // println!("v = {:?}", v);
    //     for j in &v {
    //     println!("{}", j);
    // }
}

fn vector_3() {
    println!("=========== vector_3 ===========");
    let mut v = vec![1, 2, 3, 4, 5];
    for i in &mut v {
        *i += 50;
    }
    println!("value of v is {:?}", v);

}

fn vector_4() {
    println!("=========== vector_4 ===========");
    let mut names = vec!["astring", "london", "pizza"];

    for (_i, name) in names.iter_mut().enumerate() {
        println!("name = {}", name.to_ascii_uppercase());
        // names.insert(i, &name.to_ascii_uppercase());
        // let mut s = name.to_ascii_uppercase();
        // name = &mut &s[..];
    }
    println!("names = {:?}", names);

}

fn vector_5() {
    println!("=========== vector_5 ===========");
    let mut names = vec!["astring", "london", "pizza"];

    for name in names.iter_mut() {
        let mut s = "ORACLE";
        *name =  &mut s;
    }
    println!("names = {:?}", names);
}

fn vector_6() {
    println!("=========== vector_6 ===========");
    let mut names = vec!["astring".to_string(), "london".to_string(), "pizza".to_string()];

    for name in names.iter_mut() {
        let s = name.to_ascii_uppercase();
        *name = s;
    }
    println!("names = {:?}", names);
}

// ******** OUTPUT *******
//
// =========== vector_1 ===========
// 1
// 2
// 3
// 4
// 5
// ---------------------
// 1
// 2
// 3
// 4
// 5
// 6
// =========== vector_2 ===========
// 1
// 2
// 3
// 4
// 5
// =========== vector_3 ===========
// value of v is [51, 52, 53, 54, 55]
// =========== vector_4 ===========
// name = ASTRING
// name = LONDON
// name = PIZZA
// names = ["astring", "london", "pizza"]
// =========== vector_5 ===========
// names = ["ORACLE", "ORACLE", "ORACLE"]
// =========== vector_6 ===========
// names = ["ASTRING", "LONDON", "PIZZA"]