moon Types
struct Iterator#
A lazy, single-pass sequence of values (Iterator<T>).
Produced by iter() on arrays, dictionaries, and ranges, and by the std.iter constructors (empty, once, repeat, from_fn). Driven one value at a time by next() or a for loop; adapters such as map, filter, take_while, flat_map, and chain stay lazy until a consumer (collect, fold, sum, count, the loop itself) pulls values through.
use std.iter
fn main() {
println([1, 2, 3].iter().map(|n| n * 2).collect())
for value in iter.repeat("ab").take(2) {
println(value)
}
println(iter.once(1).chain([2, 3].iter()).sum())
println([1, 2, 3, 4].iter().filter(|n| n % 2 == 0).count())
}