rust/graph/unfold.rs


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extern crate itertools;

use itertools::Unfold;

fn main() {
    for n in Unfold::new(1, |state| {
        if *state < 100 {
            *state += 1;
            Some(*state)
        } else {
            None
        }
    }) {
        println!("{}", n);
    }
}