Rust implementation demo

gistfile1.rs

impl util for uint {
    fn str() -> str { uint::str(self) }
    fn times(f: block(uint)) {
        let c = 0u;
        while c < self { f(c); c += 1u; }
    }
}

impl util<T> for [T] {
    fn len() -> uint { vec::len(self) }
    fn iter(f: block(T)) { for x in self { f(x); } }
    fn map<U>(f: block(T) -> U) -> [U] {
        let r = [];
        for elt in self { r += [f(elt)]; }
        r
    }
}

fn main() {
    log_err [1].len().str();
    log_err [3, 4].map({|a| a + 4});
    10u.times({|n| log_err n;});
}