[−][src]Struct b961fce::KV
Implementations
impl KV
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Methods from Deref<Target = JsValue>
pub const NULL: JsValue
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pub const UNDEFINED: JsValue
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pub const TRUE: JsValue
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pub const FALSE: JsValue
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pub fn into_serde<T>(&self) -> Result<T, Error> where
T: for<'a> Deserialize<'a>,
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T: for<'a> Deserialize<'a>,
Invokes JSON.stringify
on this value and then parses the resulting
JSON into an arbitrary Rust value.
This function will first call JSON.stringify
on the JsValue
itself.
The resulting string is then passed into Rust which then parses it as
JSON into the resulting value.
Usage of this API requires activating the serde-serialize
feature of
the wasm-bindgen
crate.
Errors
Returns any error encountered when parsing the JSON into a T
.
pub fn as_f64(&self) -> Option<f64>
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Returns the f64
value of this JS value if it's an instance of a
number.
If this JS value is not an instance of a number then this returns
None
.
pub fn is_string(&self) -> bool
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Tests whether this JS value is a JS string.
pub fn as_string(&self) -> Option<String>
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If this JS value is a string value, this function copies the JS string
value into wasm linear memory, encoded as UTF-8, and returns it as a
Rust String
.
To avoid the copying and re-encoding, consider the
JsString::try_from()
function from js-sys
instead.
If this JS value is not an instance of a string or if it's not valid
utf-8 then this returns None
.
UTF-16 vs UTF-8
JavaScript strings in general are encoded as UTF-16, but Rust strings
are encoded as UTF-8. This can cause the Rust string to look a bit
different than the JS string sometimes. For more details see the
documentation about the str
type which contains a few
caveats about the encodings.
pub fn as_bool(&self) -> Option<bool>
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Returns the bool
value of this JS value if it's an instance of a
boolean.
If this JS value is not an instance of a boolean then this returns
None
.
pub fn is_null(&self) -> bool
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Tests whether this JS value is null
pub fn is_undefined(&self) -> bool
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Tests whether this JS value is undefined
pub fn is_symbol(&self) -> bool
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Tests whether the type of this JS value is symbol
pub fn is_object(&self) -> bool
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Tests whether typeof self == "object" && self !== null
.
pub fn is_function(&self) -> bool
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Tests whether the type of this JS value is function
.
pub fn is_truthy(&self) -> bool
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Tests whether the value is "truthy".
pub fn is_falsy(&self) -> bool
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Tests whether the value is "falsy".
Trait Implementations
impl AsRef<JsValue> for KV
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impl AsRef<KV> for KV
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impl Deref for KV
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impl From<JsValue> for KV
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impl From<KV> for JsValue
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impl FromWasmAbi for KV
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type Abi = <JsValue as FromWasmAbi>::Abi
The wasm ABI type that this converts from when coming back out from the ABI boundary. Read more
unsafe fn from_abi(js: Self::Abi) -> Self
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impl IntoWasmAbi for KV
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type Abi = <JsValue as IntoWasmAbi>::Abi
The wasm ABI type that this converts into when crossing the ABI boundary. Read more
fn into_abi(self) -> Self::Abi
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impl<'a> IntoWasmAbi for &'a KV
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type Abi = <&'a JsValue as IntoWasmAbi>::Abi
The wasm ABI type that this converts into when crossing the ABI boundary. Read more
fn into_abi(self) -> Self::Abi
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impl JsCast for KV
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fn instanceof(val: &JsValue) -> bool
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fn unchecked_from_js(val: JsValue) -> Self
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fn unchecked_from_js_ref(val: &JsValue) -> &Self
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pub fn has_type<T>(&self) -> bool where
T: JsCast,
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T: JsCast,
pub fn dyn_into<T>(self) -> Result<T, Self> where
T: JsCast,
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T: JsCast,
pub fn dyn_ref<T>(&self) -> Option<&T> where
T: JsCast,
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T: JsCast,
pub fn unchecked_into<T>(self) -> T where
T: JsCast,
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T: JsCast,
pub fn unchecked_ref<T>(&self) -> &T where
T: JsCast,
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T: JsCast,
pub fn is_instance_of<T>(&self) -> bool where
T: JsCast,
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T: JsCast,
pub fn is_type_of(val: &JsValue) -> bool
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impl OptionFromWasmAbi for KV
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impl OptionIntoWasmAbi for KV
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impl<'a> OptionIntoWasmAbi for &'a KV
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impl RefFromWasmAbi for KV
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type Abi = <JsValue as RefFromWasmAbi>::Abi
The wasm ABI type references to Self
are recovered from.
type Anchor = ManuallyDrop<KV>
The type that holds the reference to Self
for the duration of the
invocation of the function that has an &Self
parameter. This is
required to ensure that the lifetimes don't persist beyond one function
call, and so that they remain anonymous. Read more
unsafe fn ref_from_abi(js: Self::Abi) -> Self::Anchor
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impl WasmDescribe for KV
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Auto Trait Implementations
impl RefUnwindSafe for KV
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impl !Send for KV
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impl !Sync for KV
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impl Unpin for KV
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impl UnwindSafe for KV
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Blanket Implementations
impl<T> Any for T where
T: 'static + ?Sized,
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T: 'static + ?Sized,
impl<T> Borrow<T> for T where
T: ?Sized,
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T: ?Sized,
impl<T> BorrowMut<T> for T where
T: ?Sized,
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T: ?Sized,
pub fn borrow_mut(&mut self) -> &mut T
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impl<T> From<T> for T
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impl<T, U> Into<U> for T where
U: From<T>,
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U: From<T>,
impl<T> ReturnWasmAbi for T where
T: IntoWasmAbi,
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T: IntoWasmAbi,
type Abi = <T as IntoWasmAbi>::Abi
Same as IntoWasmAbi::Abi
pub fn return_abi(self) -> <T as ReturnWasmAbi>::Abi
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impl<T, U> TryFrom<U> for T where
U: Into<T>,
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U: Into<T>,
type Error = Infallible
The type returned in the event of a conversion error.
pub fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>
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impl<T, U> TryInto<U> for T where
U: TryFrom<T>,
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U: TryFrom<T>,