Struct tera::Map

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

Re-export Value and other useful things from serde so apps/tools can encode data in Tera types Represents a JSON key/value type.

Implementations

impl Map<String, Value>

Re-export Value and other useful things from serde so apps/tools can encode data in Tera types

pub fn new() -> Map<String, Value>

Makes a new empty Map.

pub fn with_capacity(capacity: usize) -> Map<String, Value>

Makes a new empty Map with the given initial capacity.

pub fn clear(&mut self)

Clears the map, removing all values.

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.

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.

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.

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.

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.

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.

pub fn append(&mut self, other: &mut Map<String, Value>)

Moves all elements from other into Self, leaving other empty.

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.

pub fn len(&self) -> usize

Returns the number of elements in the map.

pub fn is_empty(&self) -> bool

Returns true if the map contains no elements.

pub fn iter(&self) -> Iter<'_>

Gets an iterator over the entries of the map.

pub fn iter_mut(&mut self) -> IterMut<'_>

Gets a mutable iterator over the entries of the map.

pub fn keys(&self) -> Keys<'_>

Gets an iterator over the keys of the map.

pub fn values(&self) -> Values<'_>

Gets an iterator over the values of the map.

pub fn values_mut(&mut self) -> ValuesMut<'_>

Gets an iterator over mutable values of the map.

Trait Implementations

impl Clone for Map<String, Value>

pub fn clone(&self) -> Map<String, Value>

Returns a copy of the value.

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

Performs copy-assignment from source.

impl Debug for Map<String, Value>

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

Formats the value using the given formatter.

impl Default for Map<String, Value>

pub fn default() -> Map<String, Value>

Returns the “default value” for a type.

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

pub 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.

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

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

Extends a collection with the contents of an iterator.

fn extend_one(&mut self, item: A)

🔬 This is a nightly-only experimental API. (extend_one)

Extends a collection with exactly one element.

fn extend_reserve(&mut self, additional: usize)

🔬 This is a nightly-only experimental API. (extend_one)

Reserves capacity in a collection for the given number of additional elements.

impl From<Map<String, Value>> for Value

pub fn from(f: Map<String, Value>) -> Value

Convert map (with string keys) to Value

Examples

use serde_json::{Map, Value};

let mut m = Map::new();
m.insert("Lorem".to_string(), "ipsum".into());
let x: Value = m.into();

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

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

Creates a value from an iterator.

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,
}

type Output = Value

The returned type after indexing.

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

Performs the indexing (container[index]) operation.

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");

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

Performs the mutable indexing (container[index]) operation.

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?

pub fn into_iter(self) -> <&'a mut Map<String, Value> as IntoIterator>::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?

pub fn into_iter(self) -> <Map<String, Value> as IntoIterator>::IntoIter

Creates an iterator from a value.

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?

pub fn into_iter(self) -> <&'a Map<String, Value> as IntoIterator>::IntoIter

Creates an iterator from a value.

impl PartialEq<Map<String, Value>> for Map<String, Value>

pub fn eq(&self, other: &Map<String, Value>) -> bool

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

#[must_use]

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

This method tests for !=.

impl Serialize for Map<String, Value>

pub 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.

impl Eq for Map<String, Value>