How to swap two variables?

Question

What is the closest equivalent Rust code to this Python code?

a, b = 1, 2
a, b = b, a + b

I am trying to write an iterative Fibonacci funct

Answer 1

In addition, a better way to implement the Fibonacci sequence in Rust is using the Iterator trait:

// Iterator data structure
struct FibIter(u32, u32);

// Iterator initialization function
fn fib() -> FibIter {
    FibIter(0u32, 1u32)
}

// Iterator trait implementation
impl Iterator for FibIter {
    type Item = u32;
    fn next(&mut self) -> Option {
        *self = FibIter(self.1, self.1 + self.0);
        Some(self.0)
    }
}

fn main() {
    println!("{:?}", fib().take(15).collect::>());
}

See The Rust Programming Language chapter on iterators.