Struct serde_json::Map
source · pub struct Map<K, V> {
map: BTreeMap<K, V>,
}
Expand description
Represents a JSON key/value type.
Fields§
§map: BTreeMap<K, V>
Implementations§
source§impl Map<String, Value>
impl Map<String, Value>
sourcepub fn with_capacity(capacity: usize) -> Self
pub fn with_capacity(capacity: usize) -> Self
Makes a new empty Map with the given initial capacity.
sourcepub fn get<Q>(&self, key: &Q) -> Option<&Value>
pub fn get<Q>(&self, key: &Q) -> Option<&Value>
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
pub fn contains_key<Q>(&self, key: &Q) -> bool
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>
pub fn get_mut<Q>(&mut self, key: &Q) -> Option<&mut Value>
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)>
pub fn get_key_value<Q>(&self, key: &Q) -> Option<(&String, &Value)>
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>
pub fn remove<Q>(&mut self, key: &Q) -> Option<Value>
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.
If serde_json’s “preserve_order” is enabled, .remove(key)
is
equivalent to [.swap_remove(key)
][Self::swap_remove], replacing this
entry’s position with the last element. If you need to preserve the
relative order of the keys in the map, use
[.shift_remove(key)
][Self::shift_remove] instead.
sourcepub fn remove_entry<Q>(&mut self, key: &Q) -> Option<(String, Value)>
pub fn remove_entry<Q>(&mut self, key: &Q) -> Option<(String, Value)>
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.
If serde_json’s “preserve_order” is enabled, .remove_entry(key)
is
equivalent to [.swap_remove_entry(key)
][Self::swap_remove_entry],
replacing this entry’s position with the last element. If you need to
preserve the relative order of the keys in the map, use
[.shift_remove_entry(key)
][Self::shift_remove_entry] instead.
sourcepub fn append(&mut self, other: &mut Self)
pub fn append(&mut self, other: &mut Self)
Moves all elements from other into self, leaving other empty.
sourcepub fn entry<S>(&mut self, key: S) -> Entry<'_>
pub fn entry<S>(&mut self, key: S) -> Entry<'_>
Gets the given key’s corresponding entry in the map for in-place manipulation.
sourcepub fn iter_mut(&mut self) -> IterMut<'_> ⓘ
pub fn iter_mut(&mut self) -> IterMut<'_> ⓘ
Gets a mutable iterator over the entries of the map.
sourcepub fn values_mut(&mut self) -> ValuesMut<'_> ⓘ
pub fn values_mut(&mut self) -> ValuesMut<'_> ⓘ
Gets an iterator over mutable values of the map.
sourcepub fn retain<F>(&mut self, f: F)
pub fn retain<F>(&mut self, f: F)
Retains only the elements specified by the predicate.
In other words, remove all pairs (k, v)
such that f(&k, &mut v)
returns false
.
sourcepub fn sort_keys(&mut self)
pub fn sort_keys(&mut self)
Sorts this map’s entries in-place using str
’s usual ordering.
If serde_json’s “preserve_order” feature is not enabled, this method does no work because all JSON maps are always kept in a sorted state.
If serde_json’s “preserve_order” feature is enabled, this method destroys the original source order or insertion order of this map in favor of an alphanumerical order that matches how a BTreeMap with the same contents would be ordered. This takes O(n log n + c) time where n is the length of the map and c is the capacity.
Other maps nested within the values of this map are not sorted. If you
need the entire data structure to be sorted at all levels, you must also
call
map.values_mut().for_each(Value::sort_all_objects)
.
Trait Implementations§
source§impl<'de> Deserialize<'de> for Map<String, Value>
impl<'de> Deserialize<'de> for Map<String, Value>
source§fn deserialize<D>(deserializer: D) -> Result<Self, D::Error>where
D: Deserializer<'de>,
fn deserialize<D>(deserializer: D) -> Result<Self, D::Error>where
D: Deserializer<'de>,
source§impl<'de> Deserializer<'de> for &'de Map<String, Value>
impl<'de> Deserializer<'de> for &'de Map<String, Value>
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self,
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self,
_name: &'static str,
_variants: &'static [&'static str],
visitor: V,
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fields: &'static [&'static str],
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impl<'de> Deserializer<'de> for Map<String, Value>
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visitor: V,
) -> Result<V::Value, <Self as Deserializer<'de>>::Error>where
V: Visitor<'de>,
fn deserialize_str<V>(
self,
visitor: V,
) -> Result<V::Value, <Self as Deserializer<'de>>::Error>where
V: Visitor<'de>,
Deserialize
type is expecting a string value and does
not benefit from taking ownership of buffered data owned by the
Deserializer
. Read moresource§fn deserialize_string<V>(
self,
visitor: V,
) -> Result<V::Value, <Self as Deserializer<'de>>::Error>where
V: Visitor<'de>,
fn deserialize_string<V>(
self,
visitor: V,
) -> Result<V::Value, <Self as Deserializer<'de>>::Error>where
V: Visitor<'de>,
Deserialize
type is expecting a string value and would
benefit from taking ownership of buffered data owned by the
Deserializer
. Read moresource§fn deserialize_bytes<V>(
self,
visitor: V,
) -> Result<V::Value, <Self as Deserializer<'de>>::Error>where
V: Visitor<'de>,
fn deserialize_bytes<V>(
self,
visitor: V,
) -> Result<V::Value, <Self as Deserializer<'de>>::Error>where
V: Visitor<'de>,
Deserialize
type is expecting a byte array and does not
benefit from taking ownership of buffered data owned by the
Deserializer
. Read moresource§fn deserialize_byte_buf<V>(
self,
visitor: V,
) -> Result<V::Value, <Self as Deserializer<'de>>::Error>where
V: Visitor<'de>,
fn deserialize_byte_buf<V>(
self,
visitor: V,
) -> Result<V::Value, <Self as Deserializer<'de>>::Error>where
V: Visitor<'de>,
Deserialize
type is expecting a byte array and would
benefit from taking ownership of buffered data owned by the
Deserializer
. Read moresource§fn deserialize_option<V>(
self,
visitor: V,
) -> Result<V::Value, <Self as Deserializer<'de>>::Error>where
V: Visitor<'de>,
fn deserialize_option<V>(
self,
visitor: V,
) -> Result<V::Value, <Self as Deserializer<'de>>::Error>where
V: Visitor<'de>,
Deserialize
type is expecting an optional value. Read moresource§fn deserialize_unit<V>(
self,
visitor: V,
) -> Result<V::Value, <Self as Deserializer<'de>>::Error>where
V: Visitor<'de>,
fn deserialize_unit<V>(
self,
visitor: V,
) -> Result<V::Value, <Self as Deserializer<'de>>::Error>where
V: Visitor<'de>,
Deserialize
type is expecting a unit value.source§fn deserialize_unit_struct<V>(
self,
name: &'static str,
visitor: V,
) -> Result<V::Value, <Self as Deserializer<'de>>::Error>where
V: Visitor<'de>,
fn deserialize_unit_struct<V>(
self,
name: &'static str,
visitor: V,
) -> Result<V::Value, <Self as Deserializer<'de>>::Error>where
V: Visitor<'de>,
Deserialize
type is expecting a unit struct with a
particular name.source§fn deserialize_newtype_struct<V>(
self,
name: &'static str,
visitor: V,
) -> Result<V::Value, <Self as Deserializer<'de>>::Error>where
V: Visitor<'de>,
fn deserialize_newtype_struct<V>(
self,
name: &'static str,
visitor: V,
) -> Result<V::Value, <Self as Deserializer<'de>>::Error>where
V: Visitor<'de>,
Deserialize
type is expecting a newtype struct with a
particular name.source§fn deserialize_seq<V>(
self,
visitor: V,
) -> Result<V::Value, <Self as Deserializer<'de>>::Error>where
V: Visitor<'de>,
fn deserialize_seq<V>(
self,
visitor: V,
) -> Result<V::Value, <Self as Deserializer<'de>>::Error>where
V: Visitor<'de>,
Deserialize
type is expecting a sequence of values.source§fn deserialize_tuple<V>(
self,
len: usize,
visitor: V,
) -> Result<V::Value, <Self as Deserializer<'de>>::Error>where
V: Visitor<'de>,
fn deserialize_tuple<V>(
self,
len: usize,
visitor: V,
) -> Result<V::Value, <Self as Deserializer<'de>>::Error>where
V: Visitor<'de>,
Deserialize
type is expecting a sequence of values and
knows how many values there are without looking at the serialized data.source§fn deserialize_tuple_struct<V>(
self,
name: &'static str,
len: usize,
visitor: V,
) -> Result<V::Value, <Self as Deserializer<'de>>::Error>where
V: Visitor<'de>,
fn deserialize_tuple_struct<V>(
self,
name: &'static str,
len: usize,
visitor: V,
) -> Result<V::Value, <Self as Deserializer<'de>>::Error>where
V: Visitor<'de>,
Deserialize
type is expecting a tuple struct with a
particular name and number of fields.source§fn deserialize_map<V>(
self,
visitor: V,
) -> Result<V::Value, <Self as Deserializer<'de>>::Error>where
V: Visitor<'de>,
fn deserialize_map<V>(
self,
visitor: V,
) -> Result<V::Value, <Self as Deserializer<'de>>::Error>where
V: Visitor<'de>,
Deserialize
type is expecting a map of key-value pairs.source§fn deserialize_struct<V>(
self,
name: &'static str,
fields: &'static [&'static str],
visitor: V,
) -> Result<V::Value, <Self as Deserializer<'de>>::Error>where
V: Visitor<'de>,
fn deserialize_struct<V>(
self,
name: &'static str,
fields: &'static [&'static str],
visitor: V,
) -> Result<V::Value, <Self as Deserializer<'de>>::Error>where
V: Visitor<'de>,
Deserialize
type is expecting a struct with a particular
name and fields.source§fn deserialize_identifier<V>(
self,
visitor: V,
) -> Result<V::Value, <Self as Deserializer<'de>>::Error>where
V: Visitor<'de>,
fn deserialize_identifier<V>(
self,
visitor: V,
) -> Result<V::Value, <Self as Deserializer<'de>>::Error>where
V: Visitor<'de>,
Deserialize
type is expecting the name of a struct
field or the discriminant of an enum variant.source§fn is_human_readable(&self) -> bool
fn is_human_readable(&self) -> bool
Deserialize
implementations should expect to
deserialize their human-readable form. Read moresource§impl Extend<(String, Value)> for Map<String, Value>
impl Extend<(String, Value)> for Map<String, Value>
source§fn extend<T>(&mut self, iter: T)
fn extend<T>(&mut self, iter: T)
source§fn extend_one(&mut self, item: A)
fn extend_one(&mut self, item: A)
extend_one
)source§fn extend_reserve(&mut self, additional: usize)
fn extend_reserve(&mut self, additional: usize)
extend_one
)source§impl<Q> Index<&Q> for Map<String, Value>
impl<Q> Index<&Q> for Map<String, Value>
Access an element of this map. Panics if the given key is not present in the map.
match val {
Value::String(s) => Some(s.as_str()),
Value::Array(arr) => arr[0].as_str(),
Value::Object(map) => map["type"].as_str(),
_ => None,
}
source§impl<Q> IndexMut<&Q> for Map<String, Value>
impl<Q> IndexMut<&Q> for Map<String, Value>
Mutably access an element of this map. Panics if the given key is not present in the map.
map["key"] = json!("value");