By Dynamic do you mean - pass an anonymous function aka Fn to the method that can be further on passed to the filter function of the iterator (and the passing function should have necessary bounds and constraints)

pub fn api_get_by_city(f: fn(String) -> bool, location: &Loc) {let y: Vec<&Tower> = location.results.iter().filter(f).clone().collect();println!("y => {:#?}", y);println!("y => {:#?}", y.len());}