【Rust】可变数组

环境

• Rust 1.56.1
• VSCode 1.61.2

概念

参考：https://doc.rust-lang.org/rust-by-example/std/vec.html

示例

可变数组（Vector）存储在堆上和普通数组的区别是长度可变。

main.rs

fn main() {
    let collected_iterator: Vec<i32> = (0..10).collect();
    println!("Collected (0..10) into: {:?}", collected_iterator);

    let mut xs = vec![1i32, 2, 3];
    println!("Initial vector: {:?}", xs);
    xs.push(4);
    println!("Vector: {:?}", xs);

    println!("Vector length: {}", xs.len());
    println!("Second element: {}", xs[1]);
    println!("Pop last element: {:?}", xs.pop());

    // 越界会出现 panic
    // println!("Fourth element: {}", xs[3]);

    for x in xs.iter() {
        println!("> {}", x);
    }

    // 可以取得迭代的索引
    for (i, x) in xs.iter().enumerate() {
        println!("In position {} we have value {}", i, x);
    }

    for x in xs.iter_mut() {
        *x *= 3;
    }
    println!("Updated vector: {:?}", xs);
}

总结

了解了 Rust 中的可变数组，它的长度是可变的。

附录