pub struct Map<K, V> { /* private fields */ }
Expand description
Represents a JSON key/value type.
Implementations
sourceimpl Map<String, Value>
impl Map<String, Value>
sourcepub fn with_capacity(capacity: usize) -> Map<String, Value>
pub fn with_capacity(capacity: usize) -> Map<String, Value>
Makes a new empty Map with the given initial capacity.
sourcepub fn get<Q>(&self, key: &Q) -> Option<&Value> where
Q: Ord + Eq + Hash + ?Sized,
String: Borrow<Q>,
pub fn get<Q>(&self, key: &Q) -> Option<&Value> where
Q: Ord + Eq + Hash + ?Sized,
String: Borrow<Q>,
Returns a reference to the value corresponding to the key.
The key may be any borrowed form of the map’s key type, but the ordering on the borrowed form must match the ordering on the key type.
sourcepub fn contains_key<Q>(&self, key: &Q) -> bool where
Q: Ord + Eq + Hash + ?Sized,
String: Borrow<Q>,
pub fn contains_key<Q>(&self, key: &Q) -> bool where
Q: Ord + Eq + Hash + ?Sized,
String: Borrow<Q>,
Returns true if the map contains a value for the specified key.
The key may be any borrowed form of the map’s key type, but the ordering on the borrowed form must match the ordering on the key type.
sourcepub fn get_mut<Q>(&mut self, key: &Q) -> Option<&mut Value> where
Q: Ord + Eq + Hash + ?Sized,
String: Borrow<Q>,
pub fn get_mut<Q>(&mut self, key: &Q) -> Option<&mut Value> where
Q: Ord + Eq + Hash + ?Sized,
String: Borrow<Q>,
Returns a mutable reference to the value corresponding to the key.
The key may be any borrowed form of the map’s key type, but the ordering on the borrowed form must match the ordering on the key type.
sourcepub fn get_key_value<Q>(&self, key: &Q) -> Option<(&String, &Value)> where
Q: Ord + Eq + Hash + ?Sized,
String: Borrow<Q>,
pub fn get_key_value<Q>(&self, key: &Q) -> Option<(&String, &Value)> where
Q: Ord + Eq + Hash + ?Sized,
String: Borrow<Q>,
Returns the key-value pair matching the given key.
The key may be any borrowed form of the map’s key type, but the ordering on the borrowed form must match the ordering on the key type.
sourcepub fn insert(&mut self, k: String, v: Value) -> Option<Value>
pub fn insert(&mut self, k: String, v: Value) -> Option<Value>
Inserts a key-value pair into the map.
If the map did not have this key present, None
is returned.
If the map did have this key present, the value is updated, and the old value is returned.
sourcepub fn remove<Q>(&mut self, key: &Q) -> Option<Value> where
Q: Ord + Eq + Hash + ?Sized,
String: Borrow<Q>,
pub fn remove<Q>(&mut self, key: &Q) -> Option<Value> where
Q: Ord + Eq + Hash + ?Sized,
String: Borrow<Q>,
Removes a key from the map, returning the value at the key if the key was previously in the map.
The key may be any borrowed form of the map’s key type, but the ordering on the borrowed form must match the ordering on the key type.
sourcepub fn remove_entry<Q>(&mut self, key: &Q) -> Option<(String, Value)> where
Q: Ord + Eq + Hash + ?Sized,
String: Borrow<Q>,
pub fn remove_entry<Q>(&mut self, key: &Q) -> Option<(String, Value)> where
Q: Ord + Eq + Hash + ?Sized,
String: Borrow<Q>,
Removes a key from the map, returning the stored key and value if the key was previously in the map.
The key may be any borrowed form of the map’s key type, but the ordering on the borrowed form must match the ordering on the key type.
sourcepub fn append(&mut self, other: &mut Map<String, Value>)
pub fn append(&mut self, other: &mut Map<String, Value>)
Moves all elements from other into Self, leaving other empty.
sourcepub fn entry<S>(&mut self, key: S) -> Entry<'_> where
S: Into<String>,
pub fn entry<S>(&mut self, key: S) -> Entry<'_> where
S: Into<String>,
Gets the given key’s corresponding entry in the map for in-place manipulation.
sourcepub fn values_mut(&mut self) -> ValuesMut<'_>
pub fn values_mut(&mut self) -> ValuesMut<'_>
Gets an iterator over mutable values of the map.
Trait Implementations
sourceimpl<'de> Deserialize<'de> for Map<String, Value>
impl<'de> Deserialize<'de> for Map<String, Value>
sourcefn deserialize<D>(
deserializer: D
) -> Result<Map<String, Value>, <D as Deserializer<'de>>::Error> where
D: Deserializer<'de>,
fn deserialize<D>(
deserializer: D
) -> Result<Map<String, Value>, <D as Deserializer<'de>>::Error> where
D: Deserializer<'de>,
Deserialize this value from the given Serde deserializer. Read more
sourceimpl Extend<(String, Value)> for Map<String, Value>
impl Extend<(String, Value)> for Map<String, Value>
sourcefn extend<T>(&mut self, iter: T) where
T: IntoIterator<Item = (String, Value)>,
fn extend<T>(&mut self, iter: T) where
T: IntoIterator<Item = (String, Value)>,
Extends a collection with the contents of an iterator. Read more
sourcefn extend_one(&mut self, item: A)
fn extend_one(&mut self, item: A)
extend_one
)Extends a collection with exactly one element.
sourcefn extend_reserve(&mut self, additional: usize)
fn extend_reserve(&mut self, additional: usize)
extend_one
)Reserves capacity in a collection for the given number of additional elements. Read more
sourceimpl<'a, Q> Index<&'a Q> for Map<String, Value> where
Q: Ord + Eq + Hash + ?Sized,
String: Borrow<Q>,
impl<'a, Q> Index<&'a Q> for Map<String, Value> where
Q: Ord + Eq + Hash + ?Sized,
String: Borrow<Q>,
Access an element of this map. Panics if the given key is not present in the map.
match *val {
Value::String(ref s) => Some(s.as_str()),
Value::Array(ref arr) => arr[0].as_str(),
Value::Object(ref map) => map["type"].as_str(),
_ => None,
}
sourceimpl<'a, Q> IndexMut<&'a Q> for Map<String, Value> where
Q: Ord + Eq + Hash + ?Sized,
String: Borrow<Q>,
impl<'a, Q> IndexMut<&'a Q> for Map<String, Value> where
Q: Ord + Eq + Hash + ?Sized,
String: Borrow<Q>,
Mutably access an element of this map. Panics if the given key is not present in the map.
map["key"] = json!("value");
sourceimpl IntoIterator for Map<String, Value>
impl IntoIterator for Map<String, Value>
sourceimpl<'a> IntoIterator for &'a Map<String, Value>
impl<'a> IntoIterator for &'a Map<String, Value>
sourceimpl<'a> IntoIterator for &'a mut Map<String, Value>
impl<'a> IntoIterator for &'a mut Map<String, Value>
sourceimpl Serialize for Map<String, Value>
impl Serialize for Map<String, Value>
sourcefn serialize<S>(
&self,
serializer: S
) -> Result<<S as Serializer>::Ok, <S as Serializer>::Error> where
S: Serializer,
fn serialize<S>(
&self,
serializer: S
) -> Result<<S as Serializer>::Ok, <S as Serializer>::Error> where
S: Serializer,
Serialize this value into the given Serde serializer. Read more
impl Eq for Map<String, Value>
Auto Trait Implementations
impl<K, V> RefUnwindSafe for Map<K, V> where
K: RefUnwindSafe,
V: RefUnwindSafe,
impl<K, V> Send for Map<K, V> where
K: Send,
V: Send,
impl<K, V> Sync for Map<K, V> where
K: Sync,
V: Sync,
impl<K, V> Unpin for Map<K, V>
impl<K, V> UnwindSafe for Map<K, V> where
K: RefUnwindSafe,
V: RefUnwindSafe,
Blanket Implementations
sourceimpl<T> BorrowMut<T> for T where
T: ?Sized,
impl<T> BorrowMut<T> for T where
T: ?Sized,
const: unstable · sourcefn borrow_mut(&mut self) -> &mut T
fn borrow_mut(&mut self) -> &mut T
Mutably borrows from an owned value. Read more