pub struct Function { /* private fields */ }
Expand description
Implementations
sourceimpl Function
impl Function
sourcepub fn new_with_args(args: &str, body: &str) -> Function
pub fn new_with_args(args: &str, body: &str) -> Function
The Function
constructor creates a new Function
object. Calling the
constructor directly can create functions dynamically, but suffers from
security and similar (but far less significant) performance issues
similar to eval
. However, unlike eval
, the Function
constructor
allows executing code in the global scope, prompting better programming
habits and allowing for more efficient code minification.
sourceimpl Function
impl Function
sourcepub fn new_no_args(body: &str) -> Function
pub fn new_no_args(body: &str) -> Function
The Function
constructor creates a new Function
object. Calling the
constructor directly can create functions dynamically, but suffers from
security and similar (but far less significant) performance issues
similar to eval
. However, unlike eval
, the Function
constructor
allows executing code in the global scope, prompting better programming
habits and allowing for more efficient code minification.
sourceimpl Function
impl Function
sourceimpl Function
impl Function
sourceimpl Function
impl Function
sourceimpl Function
impl Function
sourcepub fn bind3(
&self,
context: &JsValue,
arg1: &JsValue,
arg2: &JsValue,
arg3: &JsValue
) -> Function
pub fn bind3(
&self,
context: &JsValue,
arg1: &JsValue,
arg2: &JsValue,
arg3: &JsValue
) -> Function
The bind()
method creates a new function that, when called, has its this keyword set to the provided value,
with a given sequence of arguments preceding any provided when the new function is called.
sourceimpl Function
impl Function
sourceimpl Function
impl Function
Methods from Deref<Target = Object>
sourcepub fn constructor(&self) -> Function
pub fn constructor(&self) -> Function
The constructor property returns a reference to the Object
constructor
function that created the instance object.
sourcepub fn has_own_property(&self, property: &JsValue) -> bool
pub fn has_own_property(&self, property: &JsValue) -> bool
The hasOwnProperty()
method returns a boolean indicating whether the
object has the specified property as its own property (as opposed to
inheriting it).
sourcepub fn is_prototype_of(&self, value: &JsValue) -> bool
pub fn is_prototype_of(&self, value: &JsValue) -> bool
The isPrototypeOf()
method checks if an object exists in another
object’s prototype chain.
sourcepub fn property_is_enumerable(&self, property: &JsValue) -> bool
pub fn property_is_enumerable(&self, property: &JsValue) -> bool
The propertyIsEnumerable()
method returns a Boolean indicating
whether the specified property is enumerable.
sourcepub fn to_locale_string(&self) -> JsString
pub fn to_locale_string(&self) -> JsString
The toLocaleString()
method returns a string representing the object.
This method is meant to be overridden by derived objects for
locale-specific purposes.
Methods from Deref<Target = JsValue>
pub const NULL: JsValue = JsValue{ idx: JSIDX_NULL, _marker: marker::PhantomData,}
pub const UNDEFINED: JsValue = JsValue{ idx: JSIDX_UNDEFINED, _marker: marker::PhantomData,}
pub const TRUE: JsValue = JsValue{ idx: JSIDX_TRUE, _marker: marker::PhantomData,}
pub const FALSE: JsValue = JsValue{ idx: JSIDX_FALSE, _marker: marker::PhantomData,}
sourcepub fn into_serde<T>(&self) -> Result<T, Error>where
T: for<'a> Deserialize<'a>,
👎Deprecated: causes dependency cycles, use serde-wasm-bindgen
or gloo_utils::format::JsValueSerdeExt
instead
pub fn into_serde<T>(&self) -> Result<T, Error>where
T: for<'a> Deserialize<'a>,
serde-wasm-bindgen
or gloo_utils::format::JsValueSerdeExt
insteadInvokes JSON.stringify
on this value and then parses the resulting
JSON into an arbitrary Rust value.
This function is deprecated, due to creating a dependency cycle in
some circumstances. Use serde-wasm-bindgen
or
gloo_utils::format::JsValueSerdeExt
instead.
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
.
sourcepub fn as_f64(&self) -> Option<f64>
pub fn as_f64(&self) -> Option<f64>
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
.
sourcepub fn as_string(&self) -> Option<String>
pub fn as_string(&self) -> Option<String>
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.
sourcepub fn as_bool(&self) -> Option<bool>
pub fn as_bool(&self) -> Option<bool>
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
.
sourcepub fn is_undefined(&self) -> bool
pub fn is_undefined(&self) -> bool
Tests whether this JS value is undefined
sourcepub fn is_function(&self) -> bool
pub fn is_function(&self) -> bool
Tests whether the type of this JS value is function
.
sourcepub fn js_in(&self, obj: &JsValue) -> bool
pub fn js_in(&self, obj: &JsValue) -> bool
Applies the binary in
JS operator on the two JsValue
s.
sourcepub fn loose_eq(&self, other: &JsValue) -> bool
pub fn loose_eq(&self, other: &JsValue) -> bool
Compare two JsValue
s for equality, using the ==
operator in JS.
sourcepub fn unsigned_shr(&self, rhs: &JsValue) -> u32
pub fn unsigned_shr(&self, rhs: &JsValue) -> u32
Applies the binary >>>
JS operator on the two JsValue
s.
sourcepub fn checked_div(&self, rhs: &JsValue) -> JsValue
pub fn checked_div(&self, rhs: &JsValue) -> JsValue
Applies the binary /
JS operator on two JsValue
s, catching and returning any RangeError
thrown.
sourcepub fn pow(&self, rhs: &JsValue) -> JsValue
pub fn pow(&self, rhs: &JsValue) -> JsValue
Applies the binary **
JS operator on the two JsValue
s.
sourcepub fn lt(&self, other: &JsValue) -> bool
pub fn lt(&self, other: &JsValue) -> bool
Applies the binary <
JS operator on the two JsValue
s.
sourcepub fn le(&self, other: &JsValue) -> bool
pub fn le(&self, other: &JsValue) -> bool
Applies the binary <=
JS operator on the two JsValue
s.
sourcepub fn ge(&self, other: &JsValue) -> bool
pub fn ge(&self, other: &JsValue) -> bool
Applies the binary >=
JS operator on the two JsValue
s.
sourcepub fn gt(&self, other: &JsValue) -> bool
pub fn gt(&self, other: &JsValue) -> bool
Applies the binary >
JS operator on the two JsValue
s.
sourcepub fn unchecked_into_f64(&self) -> f64
pub fn unchecked_into_f64(&self) -> f64
Applies the unary +
JS operator on a JsValue
. Can throw.
Trait Implementations
sourceimpl FromWasmAbi for Function
impl FromWasmAbi for Function
sourceimpl<'a> IntoWasmAbi for &'a Function
impl<'a> IntoWasmAbi for &'a Function
sourceimpl IntoWasmAbi for Function
impl IntoWasmAbi for Function
sourceimpl JsCast for Function
impl JsCast for Function
sourcefn instanceof(val: &JsValue) -> bool
fn instanceof(val: &JsValue) -> bool
instanceof
check to see whether the JsValue
provided is an instance of this type. Read moresourcefn is_type_of(val: &JsValue) -> bool
fn is_type_of(val: &JsValue) -> bool
JsValue
provided
is a value of this type. Read moresourcefn unchecked_from_js(val: JsValue) -> Function
fn unchecked_from_js(val: JsValue) -> Function
sourcefn unchecked_from_js_ref(val: &JsValue) -> &Function
fn unchecked_from_js_ref(val: &JsValue) -> &Function
sourcefn has_type<T>(&self) -> boolwhere
T: JsCast,
fn has_type<T>(&self) -> boolwhere
T: JsCast,
T
. Read moresourcefn dyn_into<T>(self) -> Result<T, Self>where
T: JsCast,
fn dyn_into<T>(self) -> Result<T, Self>where
T: JsCast,
T
. Read moresourcefn dyn_ref<T>(&self) -> Option<&T>where
T: JsCast,
fn dyn_ref<T>(&self) -> Option<&T>where
T: JsCast,
T
. Read moresourcefn unchecked_into<T>(self) -> Twhere
T: JsCast,
fn unchecked_into<T>(self) -> Twhere
T: JsCast,
sourcefn unchecked_ref<T>(&self) -> &Twhere
T: JsCast,
fn unchecked_ref<T>(&self) -> &Twhere
T: JsCast,
sourcefn is_instance_of<T>(&self) -> boolwhere
T: JsCast,
fn is_instance_of<T>(&self) -> boolwhere
T: JsCast,
T
. Read moresourceimpl OptionFromWasmAbi for Function
impl OptionFromWasmAbi for Function
sourceimpl<'a> OptionIntoWasmAbi for &'a Function
impl<'a> OptionIntoWasmAbi for &'a Function
sourceimpl OptionIntoWasmAbi for Function
impl OptionIntoWasmAbi for Function
sourceimpl RefFromWasmAbi for Function
impl RefFromWasmAbi for Function
type Abi = <JsValue as RefFromWasmAbi>::Abi
type Abi = <JsValue as RefFromWasmAbi>::Abi
Self
are recovered from.type Anchor = ManuallyDrop<Function>
type Anchor = ManuallyDrop<Function>
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 moresourceunsafe fn ref_from_abi(
js: <Function as RefFromWasmAbi>::Abi
) -> <Function as RefFromWasmAbi>::Anchor
unsafe fn ref_from_abi(
js: <Function as RefFromWasmAbi>::Abi
) -> <Function as RefFromWasmAbi>::Anchor
impl Eq for Function
impl StructuralEq for Function
impl StructuralPartialEq for Function
Auto Trait Implementations
impl RefUnwindSafe for Function
impl !Send for Function
impl !Sync for Function
impl Unpin for Function
impl UnwindSafe for Function
Blanket Implementations
sourceimpl<T> BorrowMut<T> for Twhere
T: ?Sized,
impl<T> BorrowMut<T> for Twhere
T: ?Sized,
const: unstable · sourcefn borrow_mut(&mut self) -> &mut T
fn borrow_mut(&mut self) -> &mut T
sourceimpl<T> ReturnWasmAbi for Twhere
T: IntoWasmAbi,
impl<T> ReturnWasmAbi for Twhere
T: IntoWasmAbi,
type Abi = <T as IntoWasmAbi>::Abi
type Abi = <T as IntoWasmAbi>::Abi
IntoWasmAbi::Abi
sourcefn return_abi(self) -> <T as ReturnWasmAbi>::Abi
fn return_abi(self) -> <T as ReturnWasmAbi>::Abi
IntoWasmAbi::into_abi
, except that it may throw and never
return in the case of Err
. Read more