Struct serde_json::map::OccupiedEntry

pub struct OccupiedEntry<'a> { /* private fields */ }

An occupied Entry. It is part of the Entry enum.

Implementations

impl<'a> OccupiedEntry<'a>

pub fn key(&self) -> &String

Gets a reference to the key in the entry.

Examples

use serde_json::map::Entry;

let mut map = serde_json::Map::new();
map.insert("serde".to_owned(), json!(12));

match map.entry("serde") {
    Entry::Occupied(occupied) => {
        assert_eq!(occupied.key(), &"serde");
    }
    Entry::Vacant(_) => unimplemented!(),
}

Examples found in repository

src/map.rs (line 539)

    pub fn key(&self) -> &String {
        match self {
            Entry::Vacant(e) => e.key(),
            Entry::Occupied(e) => e.key(),
        }
    }

pub fn get(&self) -> &Value

Gets a reference to the value in the entry.

Examples

use serde_json::map::Entry;

let mut map = serde_json::Map::new();
map.insert("serde".to_owned(), json!(12));

match map.entry("serde") {
    Entry::Occupied(occupied) => {
        assert_eq!(occupied.get(), 12);
    }
    Entry::Vacant(_) => unimplemented!(),
}

pub fn get_mut(&mut self) -> &mut Value

Gets a mutable reference to the value in the entry.

Examples

use serde_json::map::Entry;

let mut map = serde_json::Map::new();
map.insert("serde".to_owned(), json!([1, 2, 3]));

match map.entry("serde") {
    Entry::Occupied(mut occupied) => {
        occupied.get_mut().as_array_mut().unwrap().push(json!(4));
    }
    Entry::Vacant(_) => unimplemented!(),
}

assert_eq!(map["serde"].as_array().unwrap().len(), 4);

Examples found in repository

src/map.rs (line 614)

    pub fn and_modify<F>(self, f: F) -> Self
    where
        F: FnOnce(&mut Value),
    {
        match self {
            Entry::Occupied(mut entry) => {
                f(entry.get_mut());
                Entry::Occupied(entry)
            }
            Entry::Vacant(entry) => Entry::Vacant(entry),
        }
    }

pub fn into_mut(self) -> &'a mut Value

Converts the entry into a mutable reference to its value.

Examples

use serde_json::map::Entry;

let mut map = serde_json::Map::new();
map.insert("serde".to_owned(), json!([1, 2, 3]));

match map.entry("serde") {
    Entry::Occupied(mut occupied) => {
        occupied.into_mut().as_array_mut().unwrap().push(json!(4));
    }
    Entry::Vacant(_) => unimplemented!(),
}

assert_eq!(map["serde"].as_array().unwrap().len(), 4);

Examples found in repository

src/map.rs (line 559)

    pub fn or_insert(self, default: Value) -> &'a mut Value {
        match self {
            Entry::Vacant(entry) => entry.insert(default),
            Entry::Occupied(entry) => entry.into_mut(),
        }
    }

    /// Ensures a value is in the entry by inserting the result of the default
    /// function if empty, and returns a mutable reference to the value in the
    /// entry.
    ///
    /// # Examples
    ///
    /// ```
    /// # use serde_json::json;
    /// #
    /// let mut map = serde_json::Map::new();
    /// map.entry("serde").or_insert_with(|| json!("hoho"));
    ///
    /// assert_eq!(map["serde"], "hoho".to_owned());
    /// ```
    pub fn or_insert_with<F>(self, default: F) -> &'a mut Value
    where
        F: FnOnce() -> Value,
    {
        match self {
            Entry::Vacant(entry) => entry.insert(default()),
            Entry::Occupied(entry) => entry.into_mut(),
        }
    }

pub fn insert(&mut self, value: Value) -> Value

Sets the value of the entry with the OccupiedEntry’s key, and returns the entry’s old value.

Examples

use serde_json::map::Entry;

let mut map = serde_json::Map::new();
map.insert("serde".to_owned(), json!(12));

match map.entry("serde") {
    Entry::Occupied(mut occupied) => {
        assert_eq!(occupied.insert(json!(13)), 12);
        assert_eq!(occupied.get(), 13);
    }
    Entry::Vacant(_) => unimplemented!(),
}

pub fn remove(self) -> Value

Takes the value of the entry out of the map, and returns it.

Examples

use serde_json::map::Entry;

let mut map = serde_json::Map::new();
map.insert("serde".to_owned(), json!(12));

match map.entry("serde") {
    Entry::Occupied(occupied) => {
        assert_eq!(occupied.remove(), 12);
    }
    Entry::Vacant(_) => unimplemented!(),
}