Does Rust have an equivalent to Python's list

问题:

Python list comprehension is really simple:

>>> l = [x ** 2 for x in range(10) if x % 2 == 0]
>>> [0, 4, 16, 36, 64] 

Does Rust have an equivalent syntax like:

let vector = vec![x for x in (1..10) if x % 2 == 0]
// [2, 4, 6, 8]

回答1:

You can just use iterators:

fn main() {
    let v1 = (0u32..9).filter(|x| x % 2 == 0).map(|x| x.pow(2)).collect::<Vec<_>>();
    let v2 = (1..10).filter(|x| x % 2 == 0).collect::<Vec<u32>>();

    println!("{:?}", v1); // [0, 4, 16, 36, 64]
    println!("{:?}", v2); // [2, 4, 6, 8]
}

回答2:

cute is a macro for Python-esque list and dictionary (HashMap) comprehensions in Rust.

#[macro_use(c)]
extern crate cute;

let vector = c![x, for x in 1..10, if x % 2 == 0];