Method kill_invader_at

src/invaders.rs:85–97

(&mut self, x: usize, y: usize)

        self.army.iter().any(|invader| invader.y >= NUM_ROWS - 1)
    }
    pub fn kill_invader_at(&mut self, x: usize, y: usize) -> u16 {
        if let Some(idx) = self
            .army
            .iter()
            .position(|invader| (invader.x == x) && (invader.y == y))
        {
            let points = self.army[idx].points;
            self.army.remove(idx);
            points
        } else {
            0
        }
    }
}

impl Default for Invaders {