Struct serde_json::Map

pub struct Map<K, V> { /* fields omitted */ }

Represents a JSON key/value type.

Methods

impl Map<String, Value>

fn new() -> Self

Makes a new empty Map.

fn with_capacity(capacity: usize) -> Self

Makes a new empty Map with the given initial capacity.

fn clear(&mut self)

Clears the map, removing all values.

fn get<Q: ?Sized>(&self, key: &Q) -> Option<&Value> where String: Borrow<Q>, Q: Ord + Eq + Hash

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.

fn contains_key<Q: ?Sized>(&self, key: &Q) -> bool where String: Borrow<Q>, Q: Ord + Eq + Hash

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.

fn get_mut<Q: ?Sized>(&mut self, key: &Q) -> Option<&mut Value> where String: Borrow<Q>, Q: Ord + Eq + Hash

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.

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. The key is not updated, though; this matters for types that can be == without being identical.

fn remove<Q: ?Sized>(&mut self, key: &Q) -> Option<Value> where String: Borrow<Q>, Q: Ord + Eq + Hash

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.

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.

fn len(&self) -> usize

Returns the number of elements in the map.

fn is_empty(&self) -> bool

Returns true if the map contains no elements.

fn iter(&self) -> Iter

Gets an iterator over the entries of the map.

fn iter_mut(&mut self) -> IterMut

Gets a mutable iterator over the entries of the map.

fn keys(&self) -> Keys

Gets an iterator over the keys of the map.

fn values(&self) -> Values

Gets an iterator over the values of the map.

Trait Implementations

impl Default for Map<String, Value>

fn default() -> Self

Returns the "default value" for a type.

impl Clone for Map<String, Value>

fn clone(&self) -> Self

Returns a copy of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl PartialEq for Map<String, Value>

fn eq(&self, other: &Self) -> bool

This method tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

This method tests for !=.

impl<'a, Q: ?Sized> Index<&'a Q> for Map<String, Value> where String: Borrow<Q>, Q: Ord + Eq + Hash

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,
}

type Output = Value

The returned type after indexing

fn index(&self, index: &Q) -> &Value

The method for the indexing (container[index]) operation

impl<'a, Q: ?Sized> IndexMut<&'a Q> for Map<String, Value> where String: Borrow<Q>, Q: Ord + Eq + Hash

Mutably access an element of this map. Panics if the given key is not present in the map.

map["key"] = json!("value");

fn index_mut(&mut self, index: &Q) -> &mut Value

The method for the mutable indexing (container[index]) operation

impl Debug for Map<String, Value>

fn fmt(&self, formatter: &mut Formatter) -> Result<(), Error>

Formats the value using the given formatter.

impl Serialize for Map<String, Value>

fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error> where S: Serializer

Serialize this value into the given Serde serializer.

impl<'de> Deserialize<'de> for Map<String, Value>

fn deserialize<D>(deserializer: D) -> Result<Self, D::Error> where D: Deserializer<'de>

Deserialize this value from the given Serde deserializer.

impl FromIterator<(String, Value)> for Map<String, Value>

fn from_iter<T>(iter: T) -> Self where T: IntoIterator<Item=(String, Value)>

Creates a value from an iterator.

impl Extend<(String, Value)> for Map<String, Value>

fn extend<T>(&mut self, iter: T) where T: IntoIterator<Item=(String, Value)>

Extends a collection with the contents of an iterator.

impl<'a> IntoIterator for &'a Map<String, Value>

type Item = (&'a String, &'a Value)

The type of the elements being iterated over.

type IntoIter = Iter<'a>

Which kind of iterator are we turning this into?

fn into_iter(self) -> Self::IntoIter

Creates an iterator from a value.

impl<'a> IntoIterator for &'a mut Map<String, Value>

type Item = (&'a String, &'a mut Value)

The type of the elements being iterated over.

type IntoIter = IterMut<'a>

Which kind of iterator are we turning this into?

fn into_iter(self) -> Self::IntoIter

Creates an iterator from a value.

impl IntoIterator for Map<String, Value>

type Item = (String, Value)

The type of the elements being iterated over.

type IntoIter = IntoIter

Which kind of iterator are we turning this into?

fn into_iter(self) -> Self::IntoIter

Creates an iterator from a value.