Struct js_sys::Function

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pub struct Function { /* private fields */ }
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impl Function

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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.

MDN documentation

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impl Function

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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.

MDN documentation

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impl Function

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pub fn apply(&self, context: &JsValue, args: &Array) -> Result<JsValue, JsValue>

The apply() method calls a function with a given this value, and arguments provided as an array (or an array-like object).

MDN documentation

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impl Function

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pub fn call0(&self, context: &JsValue) -> Result<JsValue, JsValue>

The call() method calls a function with a given this value and arguments provided individually.

MDN documentation

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impl Function

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pub fn call1( &self, context: &JsValue, arg1: &JsValue ) -> Result<JsValue, JsValue>

The call() method calls a function with a given this value and arguments provided individually.

MDN documentation

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impl Function

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pub fn call2( &self, context: &JsValue, arg1: &JsValue, arg2: &JsValue ) -> Result<JsValue, JsValue>

The call() method calls a function with a given this value and arguments provided individually.

MDN documentation

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impl Function

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pub fn call3( &self, context: &JsValue, arg1: &JsValue, arg2: &JsValue, arg3: &JsValue ) -> Result<JsValue, JsValue>

The call() method calls a function with a given this value and arguments provided individually.

MDN documentation

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impl Function

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pub fn bind(&self, context: &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.

MDN documentation

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impl Function

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pub fn bind0(&self, context: &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.

MDN documentation

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impl Function

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pub fn bind1(&self, context: &JsValue, arg1: &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.

MDN documentation

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impl Function

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pub fn bind2( &self, context: &JsValue, arg1: &JsValue, arg2: &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.

MDN documentation

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impl Function

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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.

MDN documentation

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impl Function

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pub fn length(&self) -> u32

The length property indicates the number of arguments expected by the function.

MDN documentation

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impl Function

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pub fn name(&self) -> JsString

A Function object’s read-only name property indicates the function’s name as specified when it was created or “anonymous” for functions created anonymously.

MDN documentation

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impl Function

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pub fn to_string(&self) -> JsString

The toString() method returns a string representing the source code of the function.

MDN documentation

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impl Function

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pub fn try_from(val: &JsValue) -> Option<&Function>

👎Deprecated: recommended to use dyn_ref instead which is now equivalent

Returns the Function value of this JS value if it’s an instance of a function.

If this JS value is not an instance of a function then this returns None.

Methods from Deref<Target = Object>§

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pub fn constructor(&self) -> Function

The constructor property returns a reference to the Object constructor function that created the instance object.

MDN documentation

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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).

MDN documentation

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pub fn is_prototype_of(&self, value: &JsValue) -> bool

The isPrototypeOf() method checks if an object exists in another object’s prototype chain.

MDN documentation

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pub fn property_is_enumerable(&self, property: &JsValue) -> bool

The propertyIsEnumerable() method returns a Boolean indicating whether the specified property is enumerable.

MDN documentation

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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.

MDN documentation

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pub fn to_string(&self) -> JsString

The toString() method returns a string representing the object.

MDN documentation

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pub fn value_of(&self) -> Object

The valueOf() method returns the primitive value of the specified object.

MDN documentation

Methods from Deref<Target = JsValue>§

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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 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.

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pub fn is_string(&self) -> bool

Tests whether this JS value is a JS string.

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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.

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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.

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pub fn is_null(&self) -> bool

Tests whether this JS value is null

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pub fn is_undefined(&self) -> bool

Tests whether this JS value is undefined

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pub fn is_symbol(&self) -> bool

Tests whether the type of this JS value is symbol

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pub fn is_object(&self) -> bool

Tests whether typeof self == "object" && self !== null.

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pub fn is_array(&self) -> bool

Tests whether this JS value is an instance of Array.

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pub fn is_function(&self) -> bool

Tests whether the type of this JS value is function.

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pub fn is_bigint(&self) -> bool

Tests whether the type of this JS value is bigint.

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pub fn js_typeof(&self) -> JsValue

Applies the unary typeof JS operator on a JsValue.

MDN documentation

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pub fn js_in(&self, obj: &JsValue) -> bool

Applies the binary in JS operator on the two JsValues.

MDN documentation

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pub fn is_truthy(&self) -> bool

Tests whether the value is “truthy”.

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pub fn is_falsy(&self) -> bool

Tests whether the value is “falsy”.

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pub fn loose_eq(&self, other: &JsValue) -> bool

Compare two JsValues for equality, using the == operator in JS.

MDN documentation

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pub fn bit_not(&self) -> JsValue

Applies the unary ~ JS operator on a JsValue.

MDN documentation

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pub fn unsigned_shr(&self, rhs: &JsValue) -> u32

Applies the binary >>> JS operator on the two JsValues.

MDN documentation

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pub fn checked_div(&self, rhs: &JsValue) -> JsValue

Applies the binary / JS operator on two JsValues, catching and returning any RangeError thrown.

MDN documentation

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pub fn pow(&self, rhs: &JsValue) -> JsValue

Applies the binary ** JS operator on the two JsValues.

MDN documentation

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

Applies the binary < JS operator on the two JsValues.

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

Applies the binary <= JS operator on the two JsValues.

MDN documentation

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

Applies the binary >= JS operator on the two JsValues.

MDN documentation

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

Applies the binary > JS operator on the two JsValues.

MDN documentation

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pub fn unchecked_into_f64(&self) -> f64

Applies the unary + JS operator on a JsValue. Can throw.

MDN documentation

Trait Implementations§

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impl AsRef<Function> for Function

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fn as_ref(&self) -> &Function

Converts this type into a shared reference of the (usually inferred) input type.
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impl AsRef<JsValue> for Function

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fn as_ref(&self) -> &JsValue

Converts this type into a shared reference of the (usually inferred) input type.
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impl AsRef<Object> for Function

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fn as_ref(&self) -> &Object

Converts this type into a shared reference of the (usually inferred) input type.
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impl Clone for Function

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fn clone(&self) -> Function

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 Debug for Function

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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 Default for Function

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fn default() -> Self

Returns the “default value” for a type. Read more
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impl Deref for Function

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type Target = Object

The resulting type after dereferencing.
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fn deref(&self) -> &Object

Dereferences the value.
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impl From<Function> for JsValue

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fn from(obj: Function) -> JsValue

Converts to this type from the input type.
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impl From<Function> for Object

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fn from(obj: Function) -> Object

Converts to this type from the input type.
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impl From<JsValue> for Function

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fn from(obj: JsValue) -> Function

Converts to this type from the input type.
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impl FromWasmAbi for Function

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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.
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unsafe fn from_abi(js: Self::Abi) -> Self

Recover a Self from Self::Abi. Read more
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impl<'a> IntoWasmAbi for &'a Function

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type Abi = <&'a JsValue as IntoWasmAbi>::Abi

The wasm ABI type that this converts into when crossing the ABI boundary.
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fn into_abi(self) -> Self::Abi

Convert self into Self::Abi so that it can be sent across the wasm ABI boundary.
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impl IntoWasmAbi for Function

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type Abi = <JsValue as IntoWasmAbi>::Abi

The wasm ABI type that this converts into when crossing the ABI boundary.
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fn into_abi(self) -> Self::Abi

Convert self into Self::Abi so that it can be sent across the wasm ABI boundary.
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impl JsCast for Function

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fn instanceof(val: &JsValue) -> bool

Performs a dynamic instanceof check to see whether the JsValue provided is an instance of this type. Read more
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fn is_type_of(val: &JsValue) -> bool

Performs a dynamic check to see whether the JsValue provided is a value of this type. Read more
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fn unchecked_from_js(val: JsValue) -> Self

Performs a zero-cost unchecked conversion from a JsValue into an instance of Self Read more
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fn unchecked_from_js_ref(val: &JsValue) -> &Self

Performs a zero-cost unchecked conversion from a &JsValue into an instance of &Self. Read more
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fn has_type<T>(&self) -> bool
where T: JsCast,

Test whether this JS value has a type T. Read more
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fn dyn_into<T>(self) -> Result<T, Self>
where T: JsCast,

Performs a dynamic cast (checked at runtime) of this value into the target type T. Read more
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fn dyn_ref<T>(&self) -> Option<&T>
where T: JsCast,

Performs a dynamic cast (checked at runtime) of this value into the target type T. Read more
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fn unchecked_into<T>(self) -> T
where T: JsCast,

Performs a zero-cost unchecked cast into the specified type. Read more
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fn unchecked_ref<T>(&self) -> &T
where T: JsCast,

Performs a zero-cost unchecked cast into a reference to the specified type. Read more
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fn is_instance_of<T>(&self) -> bool
where T: JsCast,

Test whether this JS value is an instance of the type T. Read more
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impl LongRefFromWasmAbi for Function

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type Abi = <JsValue as LongRefFromWasmAbi>::Abi

Same as RefFromWasmAbi::Abi
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type Anchor = Function

Same as RefFromWasmAbi::Anchor
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unsafe fn long_ref_from_abi(js: Self::Abi) -> Self::Anchor

Same as RefFromWasmAbi::ref_from_abi
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impl OptionFromWasmAbi for Function

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fn is_none(abi: &Self::Abi) -> bool

Tests whether the argument is a “none” instance. If so it will be deserialized as None, and otherwise it will be passed to FromWasmAbi.
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impl<'a> OptionIntoWasmAbi for &'a Function

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fn none() -> Self::Abi

Returns an ABI instance indicating “none”, which JS will interpret as the None branch of this option. Read more
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impl OptionIntoWasmAbi for Function

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fn none() -> Self::Abi

Returns an ABI instance indicating “none”, which JS will interpret as the None branch of this option. Read more
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impl PartialEq for Function

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fn eq(&self, other: &Function) -> 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 RefFromWasmAbi for Function

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type Abi = <JsValue as RefFromWasmAbi>::Abi

The wasm ABI type references to Self are recovered from.
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type Anchor = ManuallyDrop<Function>

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.
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unsafe fn ref_from_abi(js: Self::Abi) -> Self::Anchor

Recover a Self::Anchor from Self::Abi. Read more
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impl WasmDescribe for Function

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impl Eq for Function

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impl StructuralPartialEq for Function

Auto Trait Implementations§

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> 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> ReturnWasmAbi for T
where T: IntoWasmAbi,

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type Abi = <T as IntoWasmAbi>::Abi

Same as IntoWasmAbi::Abi
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fn return_abi(self) -> <T as ReturnWasmAbi>::Abi

Same as IntoWasmAbi::into_abi, except that it may throw and never return in the case of Err.
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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> VectorFromWasmAbi for T
where T: JsObject,

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impl<T> VectorIntoWasmAbi for T
where T: JsObject,