Iterator Pipeline

10 points

Implement total_revenue, which sums the amount of every non-refunded order. Write it as a single lazy chain rather than a manual for loop with an accumulator variable.

Required signature

pub struct Order {     pub amount: f64,     pub refunded: bool, }  pub fn total_revenue(orders: &[Order]) -> f64;

Visible tests

sums_non_refunded

#[test]
fn sums_non_refunded() {
    let orders = vec![
        Order { amount: 100.0, refunded: false },
        Order { amount: 50.0, refunded: true },
        Order { amount: 25.0, refunded: false },
    ];
    assert_eq!(total_revenue(&orders), 125.0);
}

Iterator Pipeline

Required signature

Visible tests

Your solution