Enum js_option::JsOption

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pub enum JsOption<T> {
    Some(T),
    Null,
    Undefined,
}
Expand description

An Option-like type with two data-less variants in addition to Some: Null and Undefined.

Variants§

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Some(T)

Some value T

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Null

Explicit absence of a value

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Undefined

Implicit absence of a value

Implementations§

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impl<T> JsOption<T>

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pub fn from_option(opt: Option<T>) -> Self

Construct a JsOption from a regular Option.

None will be converted to to Null.

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pub fn from_implicit_option(opt: Option<T>) -> Self

Construct a JsOption from a regular Option.

None will be converted to Undefined.

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pub fn into_option(self) -> Option<T>

Convert a JsOption to Option.

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pub fn into_nested_option(self) -> Option<Option<T>>

Convert a JsOption<T> to Option<Option<T>>.

Null is represented as Some(None) while Undefined is represented as None.

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pub const fn is_some(&self) -> bool

Returns true if the JsOption contains a value.

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pub const fn is_null(&self) -> bool

Returns true if the JsOption is Null.

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pub const fn is_undefined(&self) -> bool

Returns true if the JsOption is Undefined.

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pub fn unwrap(self) -> T

Returns the contained Some value, consuming the self value.

§Panics

Panics if the self value equals Null or Undefined.

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pub fn unwrap_or(self, default: T) -> T

Returns the contained Some value or a provided default.

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pub fn unwrap_or_else<F: FnOnce() -> T>(self, f: F) -> T

Returns the contained Some value computes is from a closure.

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pub fn map<U, F: FnOnce(T) -> U>(self, f: F) -> JsOption<U>

Maps a JsOption<T> to JsOption<U> by applying a function to a contained value.

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pub const fn as_ref(&self) -> JsOption<&T>

Converts from &Option<T> to Option<&T>.

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pub fn as_mut(&mut self) -> JsOption<&mut T>

Converts from &mut Option<T> to Option<&mut T>.

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impl<T: Default> JsOption<T>

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pub fn unwrap_or_default(self) -> T

Returns the contained Some value or a default.

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impl<T: Deref> JsOption<T>

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pub fn as_deref(&self) -> JsOption<&<T as Deref>::Target>

Converts from &JsOption<T> to JsOption<&T::Target>.

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impl<T: DerefMut> JsOption<T>

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pub fn as_deref_mut(&mut self) -> JsOption<&mut <T as Deref>::Target>

Converts from &mut JsOption<T> to JsOption<&mut T::Target>.

Trait Implementations§

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impl<T: Clone> Clone for JsOption<T>

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fn clone(&self) -> JsOption<T>

Returns a copy of the value. Read more
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fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source. Read more
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impl<T: Debug> Debug for JsOption<T>

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

Formats the value using the given formatter. Read more
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impl<T> Default for JsOption<T>

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fn default() -> Self

Returns the default value, JsOption::Undefined.

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impl<'de, T> Deserialize<'de> for JsOption<T>
where T: Deserialize<'de>,

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

Deserialize a JsOption.

This implementation will never return Undefined. You need to use #[serde(default)] to get Undefined when the field is not present.

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impl<T: Hash> Hash for JsOption<T>

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fn hash<__H: Hasher>(&self, state: &mut __H)

Feeds this value into the given Hasher. Read more
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fn hash_slice<H>(data: &[Self], state: &mut H)
where H: Hasher, Self: Sized,

Feeds a slice of this type into the given Hasher. Read more
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impl<T: Ord> Ord for JsOption<T>

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fn cmp(&self, other: &JsOption<T>) -> Ordering

This method returns an Ordering between self and other. Read more
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fn max(self, other: Self) -> Self
where Self: Sized,

Compares and returns the maximum of two values. Read more
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fn min(self, other: Self) -> Self
where Self: Sized,

Compares and returns the minimum of two values. Read more
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fn clamp(self, min: Self, max: Self) -> Self
where Self: Sized + PartialOrd,

Restrict a value to a certain interval. Read more
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impl<T: PartialEq> PartialEq for JsOption<T>

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fn eq(&self, other: &JsOption<T>) -> bool

This method tests for self and other values to be equal, and is used by ==.
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fn ne(&self, other: &Rhs) -> bool

This method tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.
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impl<T: PartialOrd> PartialOrd for JsOption<T>

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fn partial_cmp(&self, other: &JsOption<T>) -> Option<Ordering>

This method returns an ordering between self and other values if one exists. Read more
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fn lt(&self, other: &Rhs) -> bool

This method tests less than (for self and other) and is used by the < operator. Read more
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fn le(&self, other: &Rhs) -> bool

This method tests less than or equal to (for self and other) and is used by the <= operator. Read more
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fn gt(&self, other: &Rhs) -> bool

This method tests greater than (for self and other) and is used by the > operator. Read more
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fn ge(&self, other: &Rhs) -> bool

This method tests greater than or equal to (for self and other) and is used by the >= operator. Read more
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impl<T> Serialize for JsOption<T>
where T: Serialize,

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

Serialize a JsOption.

Serialization will fail for JsOption::Undefined. You need to use #[skip_serializing_if = "JsOption::is_undefined"] to stop the field from being serialized altogether.

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impl<T: Copy> Copy for JsOption<T>

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impl<T: Eq> Eq for JsOption<T>

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impl<T> StructuralPartialEq for JsOption<T>

Auto Trait Implementations§

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impl<T> Freeze for JsOption<T>
where T: Freeze,

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impl<T> RefUnwindSafe for JsOption<T>
where T: RefUnwindSafe,

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impl<T> Send for JsOption<T>
where T: Send,

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impl<T> Sync for JsOption<T>
where T: Sync,

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impl<T> Unpin for JsOption<T>
where T: Unpin,

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impl<T> UnwindSafe for JsOption<T>
where T: UnwindSafe,

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,

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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,

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

Mutably borrows from an owned value. Read more
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impl<T> CloneToUninit for T
where T: Clone,

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default unsafe fn clone_to_uninit(&self, dst: *mut T)

🔬This is a nightly-only experimental API. (clone_to_uninit)
Performs copy-assignment from self to dst. Read more
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impl<T> CloneToUninit for T
where T: Copy,

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unsafe fn clone_to_uninit(&self, dst: *mut T)

🔬This is a nightly-only experimental API. (clone_to_uninit)
Performs copy-assignment from self to dst. Read more
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impl<T> From<T> for T

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fn from(t: T) -> T

Returns the argument unchanged.

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

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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> ToOwned for T
where T: Clone,

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type Owned = T

The resulting type after obtaining ownership.
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fn to_owned(&self) -> T

Creates owned data from borrowed data, usually by cloning. Read more
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fn clone_into(&self, target: &mut T)

Uses borrowed data to replace owned data, usually by cloning. Read more
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impl<T, U> TryFrom<U> for T
where U: Into<T>,

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type Error = Infallible

The type returned in the event of a conversion error.
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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>,

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

The type returned in the event of a conversion error.
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fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>

Performs the conversion.
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impl<T> DeserializeOwned for T
where T: for<'de> Deserialize<'de>,