【Rust】字符串（二）

环境

• Time 2022-03-24
• Rust 1.59.0

示例

capacity

fn main() {
    let name = String::from("JiangBo");
    println!("{:?}", name.capacity());
}

reserve

fn main() {
    let mut name = String::from("JiangBo");
    name.reserve(10);
    println!("{:?}", name.capacity());
}

reserve_exact

fn main() {
    let mut name = String::from("JiangBo");
    name.reserve_exact(10);
    println!("{:?}", name.capacity());
}

shrink_to_fit

fn main() {
    let mut name = String::from("JiangBo");
    name.reserve_exact(10);
    println!("{:?}", name.capacity());
    name.shrink_to_fit();
    println!("{:?}", name.capacity());
}

shrink_to

fn main() {
    let mut name = String::from("JiangBo");
    name.reserve_exact(10);
    println!("{:?}", name.capacity());
    name.shrink_to(10);
    println!("{:?}", name.capacity());
}

push

fn main() {
    let mut name = String::from("JiangBo");
    name.push('!');
    println!("{name:?}");
}

as_bytes

fn main() {
    let name = String::from("JiangBo");
    let name = name.as_bytes();
    println!("{name:?}");
}

truncate

fn main() {
    let mut name = String::from("JiangBo");
    name.truncate(5);
    println!("{name:?}");
}

pop

fn main() {
    let mut name = String::from("JiangBo");
    name.pop();
    println!("{name:?}");
}

总结

了解了字符串中相关的一些方法。

附录