# OccupiedEntry in serde_json::map - Rust
An occupied Entry. It is part of the `Entry` enum.
Keywords: rust, rustlang, rust-lang, OccupiedEntry

# Struct serde_json::map::OccupiedEntry

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

Expand description

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

## Implementations

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### impl<'a> OccupiedEntry<'a>

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#### 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!(),
    }

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#### 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!(),
    }

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#### 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);

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#### 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);

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#### 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!(),
    }

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#### 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!(),
    }

## Auto Trait Implementations

### impl<'a> RefUnwindSafe for OccupiedEntry<'a>

### impl<'a> Send for OccupiedEntry<'a>

### impl<'a> Sync for OccupiedEntry<'a>

### impl<'a> Unpin for OccupiedEntry<'a>

### impl<'a> !UnwindSafe for OccupiedEntry<'a>

## Blanket Implementations

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### impl<T> Any for T where
T: 'static + ?Sized,

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#### fn type_id(&self) -> TypeId

Gets the `TypeId` of `self`. Read more

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### impl<T> Borrow<T> for T where
T: ?Sized,

const: unstable · source

#### fn borrow(&self) -> &T

Immutably borrows from an owned value. Read more

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### impl<T> BorrowMut<T> for T where
T: ?Sized,

const: unstable · source

#### fn borrow_mut(&mut self) -> &mut T

Mutably borrows from an owned value. Read more

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### impl<T> From<T> for T

const: unstable · source

#### fn from(t: T) -> T

Returns the argument unchanged.

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### impl<T, U> Into<U> for T where
U: From<T>,

const: unstable · source

#### fn into(self) -> U

Calls `U::from(self)`.

That is, this conversion is whatever the implementation of `From<T> for U` chooses to do.

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### impl<T, U> TryFrom<U> for T where
U: Into<T>,

#### type Error = Infallible

The type returned in the event of a conversion error.

const: unstable · source

#### fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>

Performs the conversion.

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### impl<T, U> TryInto<U> for T where
U: TryFrom<T>,

#### type Error = <U as TryFrom<T>>::Error

The type returned in the event of a conversion error.

const: unstable · source

#### fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>

Performs the conversion.