Struct js_sys::Set

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

The add() method appends a new element with a specified value to the end of a Set object.

MDN documentation

The clear() method removes all elements from a Set object.

MDN documentation

The delete() method removes the specified element from a Set object.

MDN documentation

The forEach() method executes a provided function once for each value in the Set object, in insertion order.

MDN documentation

The has() method returns a boolean indicating whether an element with the specified value exists in a Set object or not.

MDN documentation

The Set object lets you store unique values of any type, whether primitive values or object references.

MDN documentation

The size accessor property returns the number of elements in a Set object.

MDN documentation

The entries() method returns a new Iterator object that contains an array of [value, value] for each element in the Set object, in insertion order. For Set objects there is no key like in Map objects. However, to keep the API similar to the Map object, each entry has the same value for its key and value here, so that an array [value, value] is returned.

MDN documentation

The keys() method is an alias for this method (for similarity with Map objects); it behaves exactly the same and returns values of Set elements.

MDN documentation

The values() method returns a new Iterator object that contains the values for each element in the Set object in insertion order.

MDN documentation

Methods from Deref<Target = Object>§

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

MDN documentation

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

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

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 type of this JS value is bigint.

Applies the unary typeof JS operator on a JsValue.

MDN documentation

Applies the binary in JS operator on the two JsValues.

MDN documentation

Tests whether the value is “truthy”.

Tests whether the value is “falsy”.

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

MDN documentation

Applies the unary ~ JS operator on a JsValue.

MDN documentation

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

MDN documentation

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

MDN documentation

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

MDN documentation

Applies the binary < JS operator on the two JsValues.

MDN documentation

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

MDN documentation

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

MDN documentation

Applies the binary > JS operator on the two JsValues.

MDN documentation

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

MDN documentation

Trait Implementations§

Converts this type into a shared reference of the (usually inferred) input type.
Converts this type into a shared reference of the (usually inferred) input type.
Converts this type into a shared reference of the (usually inferred) input type.
Returns a copy of the value. Read more
Performs copy-assignment from source. Read more
Formats the value using the given formatter. Read more
The resulting type after dereferencing.
Dereferences the value.
Converts to this type from the input type.
Converts to this type from the input type.
Converts to this type from the input type.
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
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
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.