pub fn new(initial_capacity: usize) -> Self {
        Self {
            map: HashMap::with_capacity(initial_capacity),
        }
    }
/// Create an empty collection with the given `initial_capacity`.
Create an empty collection with the given `initial_capacity`.
Create an empty collection with the given ` initial_capacity ` .
pub fn new(initial_capacity: usize) -> Self {
        Self {
            map: HashMap::with_capacity(initial_capacity),
        }
    }
pub fn new ( initial_capacity : usize ) -> Self { Self { map : HashMap :: with_capacity ( initial_capacity ) , } }
Create an empty collection with the given `initial_capacity`.
Create an empty collection with the given ` initial_capacity ` .
initial_capacity
usize