Struct js_sys::Object

source · [−]
#[repr(transparent)]
pub struct Object { /* private fields */ }
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Implementations

The Object.assign() method is used to copy the values of all enumerable own properties from one or more source objects to a target object. It will return the target object.

MDN documentation

The Object.assign() method is used to copy the values of all enumerable own properties from one or more source objects to a target object. It will return the target object.

MDN documentation

The Object.assign() method is used to copy the values of all enumerable own properties from one or more source objects to a target object. It will return the target object.

MDN documentation

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

MDN documentation

The Object.create() method creates a new object, using an existing object to provide the newly created object’s prototype.

MDN documentation

The static method Object.defineProperty() defines a new property directly on an object, or modifies an existing property on an object, and returns the object.

MDN documentation

The Object.defineProperties() method defines new or modifies existing properties directly on an object, returning the object.

MDN documentation

The Object.entries() method returns an array of a given object’s own enumerable property [key, value] pairs, in the same order as that provided by a for…in loop (the difference being that a for-in loop enumerates properties in the prototype chain as well).

MDN documentation

The Object.freeze() method freezes an object: that is, prevents new properties from being added to it; prevents existing properties from being removed; and prevents existing properties, or their enumerability, configurability, or writability, from being changed, it also prevents the prototype from being changed. The method returns the passed object.

MDN documentation

The Object.fromEntries() method transforms a list of key-value pairs into an object.

MDN documentation

The Object.getOwnPropertyDescriptor() method returns a property descriptor for an own property (that is, one directly present on an object and not in the object’s prototype chain) of a given object.

MDN documentation

The Object.getOwnPropertyDescriptors() method returns all own property descriptors of a given object.

MDN documentation

The Object.getOwnPropertyNames() method returns an array of all properties (including non-enumerable properties except for those which use Symbol) found directly upon a given object.

MDN documentation

The Object.getOwnPropertySymbols() method returns an array of all symbol properties found directly upon a given object.

MDN documentation

The Object.getPrototypeOf() method returns the prototype (i.e. the value of the internal [[Prototype]] property) of the specified object.

MDN documentation

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

The Object.is() method determines whether two values are the same value.

MDN documentation

The Object.isExtensible() method determines if an object is extensible (whether it can have new properties added to it).

MDN documentation

The Object.isFrozen() determines if an object is frozen.

MDN documentation

The Object.isSealed() method determines if an object is sealed.

MDN documentation

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

MDN documentation

The Object.keys() method returns an array of a given object’s property names, in the same order as we get with a normal loop.

MDN documentation

The Object constructor creates an object wrapper.

MDN documentation

The Object.preventExtensions() method prevents new properties from ever being added to an object (i.e. prevents future extensions to the object).

MDN documentation

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

MDN documentation

The Object.seal() method seals an object, preventing new properties from being added to it and marking all existing properties as non-configurable. Values of present properties can still be changed as long as they are writable.

MDN documentation

The Object.setPrototypeOf() method sets the prototype (i.e., the internal [[Prototype]] property) of a specified object to another object or null.

MDN documentation

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

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

MDN documentation

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

MDN documentation

The Object.values() method returns an array of a given object’s own enumerable property values, in the same order as that provided by a for...in loop (the difference being that a for-in loop enumerates properties in the prototype chain as well).

MDN documentation

Returns the Object value of this JS value if it’s an instance of an object.

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

Methods from Deref<Target = JsValue>

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.

Tests whether this JS value is a JS 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.

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.

Tests whether this JS value is null

Tests whether this JS value is undefined

Tests whether the type of this JS value is symbol

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

Tests whether the type of this JS value is function.

Tests whether the value is “truthy”.

Tests whether the value is “falsy”.

Trait Implementations

Performs the conversion.

Performs the conversion.

Performs the conversion.

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Returns a copy of the value. Read more

Performs copy-assignment from source. Read more

Formats the value using the given formatter. Read more

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

The resulting type after dereferencing.

Dereferences the value.

Performs the conversion.

Performs the conversion.

Performs the conversion.

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The wasm ABI type that this converts from when coming back out from the ABI boundary. Read more

Recover a Self from Self::Abi. Read more

The wasm ABI type that this converts into when crossing the ABI boundary. Read more

Convert self into Self::Abi so that it can be sent across the wasm ABI boundary. Read more

The wasm ABI type that this converts into when crossing the ABI boundary. Read more

Convert self into Self::Abi so that it can be sent across the wasm ABI boundary. Read more

Performs a dynamic instanceof check to see whether the JsValue provided is an instance of this type. Read more

Performs a zero-cost unchecked conversion from a JsValue into an instance of Self Read more

Performs a zero-cost unchecked conversion from a &JsValue into an instance of &Self. Read more

Test whether this JS value has a type T. Read more

Performs a dynamic cast (checked at runtime) of this value into the target type T. Read more

Performs a dynamic cast (checked at runtime) of this value into the target type T. Read more

Performs a zero-cost unchecked cast into the specified type. Read more

Performs a zero-cost unchecked cast into a reference to the specified type. Read more

Test whether this JS value is an instance of the type T. Read more

Performs a dynamic check to see whether the JsValue provided is a value of this type. Read more

Tests whether the argument is a “none” instance. If so it will be deserialized as None, and otherwise it will be passed to FromWasmAbi. Read more

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

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

This method tests for self and other values to be equal, and is used by ==. Read more

This method tests for !=.

The wasm ABI type references to Self are recovered from.

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

Recover a Self::Anchor from Self::Abi. Read more

Auto Trait Implementations

Blanket Implementations

Gets the TypeId of self. Read more

Immutably borrows from an owned value. Read more

Mutably borrows from an owned value. Read more

Returns the argument unchanged.

Calls U::from(self).

That is, this conversion is whatever the implementation of From<T> for U chooses to do.

Same as IntoWasmAbi::Abi

Same as IntoWasmAbi::into_abi, except that it may throw and never return in the case of Err. Read more

The resulting type after obtaining ownership.

Creates owned data from borrowed data, usually by cloning. Read more

🔬 This is a nightly-only experimental API. (toowned_clone_into)

Uses borrowed data to replace owned data, usually by cloning. Read more

The type returned in the event of a conversion error.

Performs the conversion.

The type returned in the event of a conversion error.

Performs the conversion.