Enum Entry 

pub enum Entry<'a> {
    Occupied(OccupiedEntry<'a>),
    Vacant(VacantEntry<'a>),
}

A view into an occupied or vacant mapping entry.

Variants

Occupied(OccupiedEntry<'a>)

An existing entry.

Vacant(VacantEntry<'a>)

A missing entry.

Implementations

impl<'a> Entry<'a>

pub fn key(&self) -> &Value

Returns the entry’s key.

pub fn or_insert(self, default: Value) -> &'a mut Value

Ensures a value is present and returns a mutable reference to it.

pub fn or_insert_with<F>(self, default: F) -> &'a mut Value

where F: FnOnce() -> Value,

Ensures a lazily produced value is present.

pub fn and_modify<F>(self, modify: F) -> Self

where F: FnOnce(&mut Value),

Modifies an occupied entry before returning it.