Enum Maybe

pub enum Maybe<T> {
    Undefined,
    Defined(T),
}

Corresponding to T | undefined

Convert as js

Undefined => undefined

Defined(value) => value

Convert as js property value

Property is always set

Variants

Undefined

Defined(T)

Implementations

impl<T> Maybe<T>

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

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

pub fn as_ref(&self) -> Maybe<&T>

impl<T: JsCast> Maybe<WrapJsCast<T>>

pub fn wrap_js_cast(v: T) -> Self

Trait Implementations

impl<T: Clone> Clone for Maybe<T>

fn clone(&self) -> Self

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl<T: Debug> Debug for Maybe<T>

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

Formats the value using the given formatter.

impl<T> Default for Maybe<T>

fn default() -> Maybe<T>

Returns Undefined

impl<T> From<Option<T>> for Maybe<T>

fn from(v: Option<T>) -> Self

Converts to this type from the input type.

impl<T: FromJs> FromJs for Maybe<T>

type Error = <T as FromJs>::Error

fn from_js(v: JsValue) -> Result<Self, Self::Error>

impl<T: Hash> Hash for Maybe<T>

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

Feeds this value into the given Hasher.

fn hash_slice<H>(data: &[Self], state: &mut H)

where H: Hasher, Self: Sized,

Feeds a slice of this type into the given Hasher.

impl<T> Into<Option<T>> for Maybe<T>

fn into(self) -> Option<T>

Converts this type into the (usually inferred) input type.

impl<T: Ord> Ord for Maybe<T>

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

This method returns an Ordering between self and other.

fn max(self, other: Self) -> Self

where Self: Sized,

Compares and returns the maximum of two values.

fn min(self, other: Self) -> Self

where Self: Sized,

Compares and returns the minimum of two values.

fn clamp(self, min: Self, max: Self) -> Self

where Self: Sized,

Restrict a value to a certain interval.

impl<T: PartialEq> PartialEq for Maybe<T>

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

Tests for self and other values to be equal, and is used by ==.

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

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl<T: PartialOrd> PartialOrd for Maybe<T>

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

This method returns an ordering between self and other values if one exists.

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

Tests less than (for self and other) and is used by the < operator.

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

Tests less than or equal to (for self and other) and is used by the <= operator.

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

Tests greater than (for self and other) and is used by the > operator.

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

Tests greater than or equal to (for self and other) and is used by the >= operator.

impl<T: ToJs> ToJs for Maybe<T>

fn to_js(&self) -> JsValue

fn to_js_property_value(&self) -> Option<JsValue>

return None to leave property unset

impl<T: Copy> Copy for Maybe<T>

impl<T: Eq> Eq for Maybe<T>

impl<T> StructuralPartialEq for Maybe<T>