# Rust 函数式


Rust 函数结果作为下一个函数的输入,类似 `let vec = "ada".chars().collect::<Vec<char>>();`

<!--more-->

```rust
fn main() {
    let vec = "abc";
    let tem = vec.chars().collect::<Vec<char>>();
    let a = Foo(1);
    let b = a.add_one().add_two();
    println!("{:?}", b);
}
#[derive(PartialEq,Debug)]
struct Foo(i32);
impl Foo {
    fn add_one(self) -> Bar {
        Bar::new(self.0)
    }
}
#[derive(PartialEq,Debug)]
struct Bar(i32);
impl Bar {
    fn new(i: i32) -> Bar {
        Bar(i)
    }
    fn add_two(self) -> Bar {
        Bar(self.0 + 2)
    }
}
```