Struct SpawnArgs 

pub struct SpawnArgs { /* private fields */ }

Methods from Deref<Target = Array>

pub fn at(&self, index: i32) -> T

where T: ErasableGenericOwn<JsValue>,

Retrieves the element at the index, counting from the end if negative (returns undefined if the index is out of range).

MDN documentation

pub fn get(&self, index: u32) -> T

where T: ErasableGenericOwn<JsValue>,

Retrieves the element at the index (returns undefined if the index is out of range).

MDN documentation

pub fn get_unchecked(&self, index: u32) -> T

where T: ErasableGenericOwn<JsValue>,

Retrieves the element at the index (returns undefined if the index is out of range).

MDN documentation

pub fn get_checked(&self, index: u32) -> Option<T>

where Option<T>: ErasableGenericOwn<Option<JsValue>>,

Retrieves the element at the index (returns None if the index is out of range, or if the element is explicitly undefined).

pub fn set(&self, index: u32, value: T)

where T: ErasableGenericOwn<JsValue>,

Sets the element at the index (auto-enlarges the array if the index is out of range).

pub fn set_ref(&self, index: u32, value: &T)

where T: ErasableGenericBorrow<JsValue>,

Sets the element at the index (auto-enlarges the array if the index is out of range).

pub fn delete(&self, index: u32)

Deletes the element at the index (does nothing if the index is out of range).

The element at the index is set to undefined.

This does not resize the array, the array will still be the same length.

pub fn copy_within(&self, target: i32, start: i32, end: i32) -> Array<T>

where Array<T>: ErasableGenericOwn<Array>,

The copyWithin() method shallow copies part of an array to another location in the same array and returns it, without modifying its size.

MDN documentation

pub fn concat<U>(&self, array: &Array<U>) -> Array<T>

where U: Upcast<T>, Array<U>: ErasableGenericBorrow<Array>, Array<T>: ErasableGenericOwn<Array>,

The concat() method is used to merge two or more arrays. This method does not change the existing arrays, but instead returns a new array.

MDN documentation

pub fn concat_many<U>(&self, array: &[Array<U>]) -> Array<T>

where U: Upcast<T>, [Array<U>]: ErasableGenericBorrow<[Array]>, Array<T>: ErasableGenericOwn<Array>,

The concat() method is used to merge two or more arrays. This method does not change the existing arrays, but instead returns a new array.

MDN documentation

pub fn every(&self, predicate: &mut dyn FnMut(T, u32, Array<T>) -> bool) -> bool

where dyn FnMut(T, u32, Array<T>) -> bool: ErasableGenericBorrowMut<dyn FnMut(JsValue, u32, Array) -> bool>,

The every() method tests whether all elements in the array pass the test implemented by the provided function.

Note: Consider using Array::try_every if the predicate might throw an error.

MDN documentation

pub fn try_every( &self, predicate: &mut dyn FnMut(T, u32) -> Result<bool, JsError>, ) -> Result<bool, JsValue>

where dyn FnMut(T, u32) -> Result<bool, JsError>: ErasableGenericBorrowMut<dyn FnMut(JsValue, u32) -> Result<bool, JsError>>,

The every() method tests whether all elements in the array pass the test implemented by the provided function. (Fallible variation)

MDN documentation

pub fn fill(&self, value: &T, start: u32, end: u32) -> Array<T>

where T: ErasableGenericBorrow<JsValue>, Array<T>: ErasableGenericOwn<Array>,

The fill() method fills all the elements of an array from a start index to an end index with a static value. The end index is not included.

MDN documentation

pub fn filter( &self, predicate: &mut dyn FnMut(T, u32, Array<T>) -> bool, ) -> Array<T>

where dyn FnMut(T, u32, Array<T>) -> bool: ErasableGenericBorrowMut<dyn FnMut(JsValue, u32, Array) -> bool>, Array<T>: ErasableGenericOwn<Array>,

The filter() method creates a new array with all elements that pass the test implemented by the provided function.

Note: Consider using Array::try_filter if the predicate might throw an error.

MDN documentation

pub fn try_filter( &self, predicate: &mut dyn FnMut(T, u32) -> Result<bool, JsError>, ) -> Result<Array<T>, JsValue>

where dyn FnMut(T, u32) -> Result<bool, JsError>: ErasableGenericBorrowMut<dyn FnMut(JsValue, u32) -> Result<bool, JsError>>, Array<T>: ErasableGenericOwn<Array>,

The filter() method creates a new array with all elements that pass the test implemented by the provided function. (Fallible variation)

MDN documentation

pub fn find(&self, predicate: &mut dyn FnMut(T, u32, Array<T>) -> bool) -> T

where dyn FnMut(T, u32, Array<T>) -> bool: ErasableGenericBorrowMut<dyn FnMut(JsValue, u32, Array) -> bool>, T: ErasableGenericOwn<JsValue>,

The find() method returns the value of the first element in the array that satisfies the provided testing function. Otherwise undefined is returned.

MDN documentation

pub fn try_find( &self, predicate: &mut dyn FnMut(T, u32) -> Result<bool, JsError>, ) -> Result<Option<T>, JsValue>

where dyn FnMut(T, u32) -> Result<bool, JsError>: ErasableGenericBorrowMut<dyn FnMut(JsValue, u32) -> Result<bool, JsError>>, Option<T>: ErasableGenericOwn<Option<JsValue>>,

The find() method returns the value of the first element in the array that satisfies the provided testing function. Otherwise undefined is returned. (Fallible variation)

MDN documentation

pub fn find_index( &self, predicate: &mut dyn FnMut(T, u32, Array<T>) -> bool, ) -> i32

where dyn FnMut(T, u32, Array<T>) -> bool: ErasableGenericBorrowMut<dyn FnMut(JsValue, u32, Array) -> bool>,

The findIndex() method returns the index of the first element in the array that satisfies the provided testing function. Otherwise -1 is returned.

Note: Consider using Array::try_find_index if the predicate might throw an error.

MDN documentation

pub fn try_find_index( &self, predicate: &mut dyn FnMut(T, u32) -> Result<bool, JsError>, ) -> Result<i32, JsValue>

where dyn FnMut(T, u32) -> Result<bool, JsError>: ErasableGenericBorrowMut<dyn FnMut(JsValue, u32) -> Result<bool, JsError>>,

The findIndex() method returns the index of the first element in the array that satisfies the provided testing function. Otherwise -1 is returned. (Fallible variation)

MDN documentation

pub fn find_last( &self, predicate: &mut dyn FnMut(T, u32, Array<T>) -> bool, ) -> T

where dyn FnMut(T, u32, Array<T>) -> bool: ErasableGenericBorrowMut<dyn FnMut(JsValue, u32, Array) -> bool>, T: ErasableGenericOwn<JsValue>,

The findLast() method of Array instances iterates the array in reverse order and returns the value of the first element that satisfies the provided testing function. If no elements satisfy the testing function, undefined is returned.

MDN documentation

pub fn try_find_last( &self, predicate: &mut dyn FnMut(T, u32) -> Result<bool, JsError>, ) -> Result<Option<T>, JsValue>

where dyn FnMut(T, u32) -> Result<bool, JsError>: ErasableGenericBorrowMut<dyn FnMut(JsValue, u32) -> Result<bool, JsError>>, Option<T>: ErasableGenericOwn<Option<JsValue>>,

The findLast() method of Array instances iterates the array in reverse order and returns the value of the first element that satisfies the provided testing function. If no elements satisfy the testing function, undefined is returned. (Fallible variation)

MDN documentation

pub fn find_last_index( &self, predicate: &mut dyn FnMut(T, u32, Array<T>) -> bool, ) -> i32

where dyn FnMut(T, u32, Array<T>) -> bool: ErasableGenericBorrowMut<dyn FnMut(JsValue, u32, Array) -> bool>,

The findLastIndex() method of Array instances iterates the array in reverse order and returns the index of the first element that satisfies the provided testing function. If no elements satisfy the testing function, -1 is returned.

Note: Consider using Array::try_find_last_index if the predicate might throw an error.

MDN documentation

pub fn try_find_last_index( &self, predicate: &mut dyn FnMut(T, u32) -> Result<bool, JsError>, ) -> Result<i32, JsValue>

where dyn FnMut(T, u32) -> Result<bool, JsError>: ErasableGenericBorrowMut<dyn FnMut(JsValue, u32) -> Result<bool, JsError>>,

The findLastIndex() method of Array instances iterates the array in reverse order and returns the index of the first element that satisfies the provided testing function. If no elements satisfy the testing function, -1 is returned. (Fallible variation)

MDN documentation

pub fn flat(&self, depth: i32) -> Array

The flat() method creates a new array with all sub-array elements concatenated into it recursively up to the specified depth.

MDN documentation

pub fn flat_map<U>( &self, callback: &mut dyn FnMut(T, u32, Array<T>) -> Vec<U>, ) -> Array<U>

where dyn FnMut(T, u32, Array<T>) -> Vec<U>: ErasableGenericBorrowMut<dyn FnMut(JsValue, u32, Array) -> Vec<JsValue>>, Array<U>: ErasableGenericOwn<Array>,

The flatMap() method first maps each element using a mapping function, then flattens the result into a new array.

Note: Consider using Array::try_flat_map for safer fallible handling.

MDN documentation

pub fn try_flat_map<U>( &self, callback: &mut dyn FnMut(T, u32) -> Vec<U>, ) -> Result<Array<U>, JsValue>

where dyn FnMut(T, u32) -> Vec<U>: ErasableGenericBorrowMut<dyn FnMut(JsValue, u32) -> Vec<JsValue>>, Array<U>: ErasableGenericOwn<Array>,

The flatMap() method first maps each element using a mapping function, then flattens the result into a new array.

MDN documentation

pub fn for_each(&self, callback: &mut dyn FnMut(T, u32, Array<T>))

where dyn FnMut(T, u32, Array<T>): ErasableGenericBorrowMut<dyn FnMut(JsValue, u32, Array)>,

The forEach() method executes a provided function once for each array element.

Note: Consider using Array::try_for_each if the callback might throw an error.

MDN documentation

pub fn try_for_each( &self, callback: &mut dyn FnMut(T, u32) -> Result<(), JsError>, ) -> Result<(), JsValue>

where dyn FnMut(T, u32) -> Result<(), JsError>: ErasableGenericBorrowMut<dyn FnMut(JsValue, u32) -> Result<(), JsError>>,

The forEach() method executes a provided function once for each array element. (Fallible variation)

MDN documentation

pub fn includes(&self, value: &T, from_index: i32) -> bool

where T: ErasableGenericBorrow<JsValue>,

The includes() method determines whether an array includes a certain element, returning true or false as appropriate.

MDN documentation

pub fn index_of(&self, value: &T, from_index: i32) -> i32

where T: ErasableGenericBorrow<JsValue>,

The indexOf() method returns the first index at which a given element can be found in the array, or -1 if it is not present.

MDN documentation

pub fn join(&self, delimiter: &str) -> JsString

The join() method joins all elements of an array (or an array-like object) into a string and returns this string.

MDN documentation

pub fn last_index_of(&self, value: &T, from_index: i32) -> i32

where T: ErasableGenericBorrow<JsValue>,

The lastIndexOf() method returns the last index at which a given element can be found in the array, or -1 if it is not present. The array is searched backwards, starting at fromIndex.

MDN documentation

pub fn length(&self) -> u32

The length property of an object which is an instance of type Array sets or returns the number of elements in that array. The value is an unsigned, 32-bit integer that is always numerically greater than the highest index in the array.

MDN documentation

pub fn set_length(&self, value: u32)

Sets the length of the array.

If it is set to less than the current length of the array, it will shrink the array.

If it is set to more than the current length of the array, it will increase the length of the array, filling the new space with empty slots.

MDN documentation

pub fn map<U>( &self, predicate: &mut dyn FnMut(T, u32, Array<T>) -> U, ) -> Array<U>

where dyn FnMut(T, u32, Array<T>) -> U: ErasableGenericBorrowMut<dyn FnMut(JsValue, u32, Array) -> JsValue>, Array<U>: ErasableGenericOwn<Array>,

map() calls a provided callback function once for each element in an array, in order, and constructs a new array from the results. callback is invoked only for indexes of the array which have assigned values, including undefined. It is not called for missing elements of the array (that is, indexes that have never been set, which have been deleted or which have never been assigned a value).

Note: Consider using Array::try_map for safer fallible handling.

MDN documentation

pub fn try_map<U>( &self, predicate: &mut dyn FnMut(T, u32) -> Result<U, JsError>, ) -> Result<Array<U>, JsValue>

where dyn FnMut(T, u32) -> Result<U, JsError>: ErasableGenericBorrowMut<dyn FnMut(JsValue, u32) -> Result<JsValue, JsError>>, Array<U>: ErasableGenericOwn<Array>,

map() calls a provided callback function once for each element in an array, in order, and constructs a new array from the results. callback is invoked only for indexes of the array which have assigned values, including undefined. It is not called for missing elements of the array (that is, indexes that have never been set, which have been deleted or which have never been assigned a value). (Fallible variation)

MDN documentation

pub fn pop(&self) -> T

where T: ErasableGenericOwn<JsValue>,

The pop() method removes the last element from an array and returns that element. This method changes the length of the array.

Note: Consider using Array::pop_checked for handling empty arrays.

MDN documentation

pub fn pop_checked(&self) -> Option<T>

where Option<T>: ErasableGenericOwn<Option<JsValue>>,

The pop() method removes the last element from an array and returns that element. This method changes the length of the array.

MDN documentation

pub fn push(&self, value: &T) -> u32

where T: ErasableGenericBorrow<JsValue>,

The push() method adds one element to the end of an array and returns the new length of the array.

MDN documentation

pub fn push_many(&self, values: &[T]) -> u32

where [T]: ErasableGenericBorrow<[JsValue]>,

The push() method adds one or more elements to the end of an array and returns the new length of the array.

MDN documentation

pub fn reduce( &self, predicate: &mut dyn FnMut(JsValue, T, u32, Array<T>) -> JsValue, initial_value: &JsValue, ) -> JsValue

where dyn FnMut(JsValue, T, u32, Array<T>) -> JsValue: ErasableGenericBorrowMut<dyn FnMut(JsValue, JsValue, u32, Array) -> JsValue>,

The reduce() method applies a function against an accumulator and each element in the array (from left to right) to reduce it to a single value.

MDN documentation

pub fn try_reduce<A>( &self, predicate: &mut dyn FnMut(A, T, u32) -> Result<A, JsError>, initial_value: &A, ) -> Result<A, JsValue>

where dyn FnMut(A, T, u32) -> Result<A, JsError>: ErasableGenericBorrowMut<dyn FnMut(JsValue, JsValue, u32) -> Result<JsValue, JsError>>, A: ErasableGenericBorrow<JsValue> + ErasableGenericOwn<JsValue>,

The reduce() method applies a function against an accumulator and each element in the array (from left to right) to reduce it to a single value. (Fallible variation)

MDN documentation

pub fn reduce_right( &self, predicate: &mut dyn FnMut(JsValue, T, u32, Array<T>) -> JsValue, initial_value: &JsValue, ) -> JsValue

where dyn FnMut(JsValue, T, u32, Array<T>) -> JsValue: ErasableGenericBorrowMut<dyn FnMut(JsValue, JsValue, u32, Array) -> JsValue>,

The reduceRight() method applies a function against an accumulator and each value of the array (from right-to-left) to reduce it to a single value.

MDN documentation

pub fn try_reduce_right<A>( &self, predicate: &mut dyn FnMut(JsValue, T, u32) -> Result<A, JsError>, initial_value: &A, ) -> Result<A, JsValue>

where dyn FnMut(JsValue, T, u32) -> Result<A, JsError>: ErasableGenericBorrowMut<dyn FnMut(JsValue, JsValue, u32) -> Result<JsValue, JsError>>, A: ErasableGenericBorrow<JsValue> + ErasableGenericOwn<JsValue>,

The reduceRight() method applies a function against an accumulator and each value of the array (from right-to-left) to reduce it to a single value. (Fallible variation)

MDN documentation

pub fn reverse(&self) -> Array<T>

where Array<T>: ErasableGenericOwn<Array>,

The reverse() method reverses an array in place. The first array element becomes the last, and the last array element becomes the first.

MDN documentation

pub fn shift(&self) -> T

where T: ErasableGenericOwn<JsValue>,

The shift() method removes the first element from an array and returns that removed element. This method changes the length of the array.

Note: Consider using Array::shift_checked for handling empty arrays.

MDN documentation

pub fn shift_checked(&self) -> Option<T>

where Option<T>: ErasableGenericOwn<Option<JsValue>>,

The shift() method removes the first element from an array and returns that removed element. This method changes the length of the array.

MDN documentation

pub fn slice(&self, start: u32, end: u32) -> Array<T>

where Array<T>: ErasableGenericOwn<Array>,

The slice() method returns a shallow copy of a portion of an array into a new array object selected from begin to end (end not included). The original array will not be modified.

MDN documentation

pub fn slice_from(&self, start: u32) -> Array<T>

where Array<T>: ErasableGenericOwn<Array>,

The slice() method returns a shallow copy of a portion of an array into a new array object selected from the given index to the end. The original array will not be modified.

MDN documentation

pub fn some(&self, predicate: &mut dyn FnMut(T) -> bool) -> bool

where dyn FnMut(T) -> bool: ErasableGenericBorrowMut<dyn FnMut(JsValue) -> bool>,

The some() method tests whether at least one element in the array passes the test implemented by the provided function. Note: This method returns false for any condition put on an empty array.

Note: Consider using Array::try_some if the predicate might throw an error.

MDN documentation

pub fn try_some( &self, predicate: &mut dyn FnMut(T) -> Result<bool, JsError>, ) -> Result<bool, JsValue>

where dyn FnMut(T) -> Result<bool, JsError>: ErasableGenericBorrowMut<dyn FnMut(JsValue) -> Result<bool, JsError>>,

The some() method tests whether at least one element in the array passes the test implemented by the provided function. (Fallible variation) Note: This method returns false for any condition put on an empty array. MDN documentation

pub fn sort(&self) -> Array<T>

where Array<T>: ErasableGenericOwn<Array>,

The sort() method sorts the elements of an array in place and returns the array. The sort is not necessarily stable. The default sort order is according to string Unicode code points.

The time and space complexity of the sort cannot be guaranteed as it is implementation dependent.

MDN documentation

pub fn sort_by(&self, compare_fn: &mut dyn FnMut(T, T) -> i32) -> Array<T>

where dyn FnMut(T, T) -> i32: ErasableGenericBorrowMut<dyn FnMut(JsValue, JsValue) -> i32>, Array<T>: ErasableGenericOwn<Array>,

The sort() method with a custom compare function.

Note: Consider using Array::try_sort_by if the predicate might throw an error.

MDN documentation

pub fn try_sort_by( &self, compare_fn: &mut dyn FnMut(T, T) -> Result<i32, JsError>, ) -> Result<Array<T>, JsValue>

where dyn FnMut(T, T) -> Result<i32, JsError>: ErasableGenericBorrowMut<dyn FnMut(JsValue, JsValue) -> Result<i32, JsError>>, Array<T>: ErasableGenericOwn<Array>,

The sort() method with a custom compare function. (Fallible variation)

MDN documentation

pub fn splice(&self, start: u32, delete_count: u32, item: &T) -> Array<T>

where T: ErasableGenericBorrow<JsValue>, Array<T>: ErasableGenericOwn<Array>,

The splice() method changes the contents of an array by removing existing elements and/or adding new elements.

MDN documentation

pub fn splice_many( &self, start: u32, delete_count: u32, items: &[T], ) -> Array<T>

where [T]: ErasableGenericBorrow<[JsValue]>, Array<T>: ErasableGenericOwn<Array>,

The splice() method changes the contents of an array by removing existing elements and/or adding new elements.

MDN documentation

pub fn to_locale_string(&self, locales: &JsValue, options: &JsValue) -> JsString

The toLocaleString() method returns a string representing the elements of the array. The elements are converted to Strings using their toLocaleString methods and these Strings are separated by a locale-specific String (such as a comma “,”).

MDN documentation

pub fn to_reversed(&self) -> Array<T>

where Array<T>: ErasableGenericOwn<Array>,

The toReversed() method returns a new array with the elements in reversed order, without modifying the original array.

MDN documentation

pub fn to_sorted(&self) -> Array<T>

where Array<T>: ErasableGenericOwn<Array>,

The toSorted() method returns a new array with the elements sorted in ascending order, without modifying the original array.

MDN documentation

pub fn to_sorted_by(&self, compare_fn: &mut dyn FnMut(T, T) -> i32) -> Array<T>

where dyn FnMut(T, T) -> i32: ErasableGenericBorrowMut<dyn FnMut(JsValue, JsValue) -> i32>, Array<T>: ErasableGenericOwn<Array>,

The toSorted() method with a custom compare function.

Note: Consider using Array::try_to_sorted_by if the predicate might throw an error.

MDN documentation

pub fn try_to_sorted_by( &self, compare_fn: &mut dyn FnMut(T, T) -> Result<i32, JsError>, ) -> Result<Array<T>, JsValue>

where dyn FnMut(T, T) -> Result<i32, JsError>: ErasableGenericBorrowMut<dyn FnMut(JsValue, JsValue) -> Result<i32, JsError>>, Array<T>: ErasableGenericOwn<Array>,

The toSorted() method with a custom compare function. (Fallible variation)

MDN documentation

pub fn to_spliced(&self, start: u32, delete_count: u32, items: &[T]) -> Array<T>

where [T]: ErasableGenericBorrow<[JsValue]>, Array<T>: ErasableGenericOwn<Array>,

The toSpliced() method returns a new array with some elements removed and/or replaced at a given index, without modifying the original array.

MDN documentation

pub fn to_string(&self) -> JsString

The toString() method returns a string representing the specified array and its elements.

MDN documentation

pub fn to_vec(&self) -> Vec<T>

where Vec<T>: ErasableGenericOwn<Vec<JsValue>>,

Converts the Array into a Vector.

pub fn unshift(&self, value: &T) -> u32

where T: ErasableGenericBorrow<JsValue>,

The unshift() method adds one element to the beginning of an array and returns the new length of the array.

MDN documentation

pub fn unshift_many(&self, values: &[T]) -> u32

where [T]: ErasableGenericBorrow<[JsValue]>,

The unshift() method adds one or more elements to the beginning of an array and returns the new length of the array.

MDN documentation

pub fn with(&self, index: u32, value: &T) -> Array<T>

where T: ErasableGenericBorrow<JsValue>, Array<T>: ErasableGenericOwn<Array>,

The with() method returns a new array with the element at the given index replaced with the given value, without modifying the original array.

MDN documentation

pub fn iter(&self) -> ArrayIter<'_, T>

Returns an iterator over the values of the JS array.

pub fn keys(&self) -> Iterator<T>

where Iterator<T>: ErasableGenericOwn<Iterator>,

The keys() method returns a new Array Iterator object that contains the keys for each index in the array.

MDN documentation

pub fn entries(&self) -> Iterator<T>

where Iterator<T>: ErasableGenericOwn<Iterator>,

👎Deprecated:

recommended to use Array::entries_typed instead for typing

The entries() method returns a new Array Iterator object that contains the key/value pairs for each index in the array.

MDN documentation

pub fn entries_typed(&self) -> Iterator<ArrayTuple<(Number, T)>>

where Iterator<ArrayTuple<(Number, T)>>: ErasableGenericOwn<Iterator<ArrayTuple<(Number, JsValue)>>>,

The entries() method returns a new Array Iterator object that contains the key/value pairs for each index in the array.

MDN documentation

pub fn values(&self) -> Iterator<T>

where Iterator<T>: ErasableGenericOwn<Iterator>,

The values() method returns a new Array Iterator object that contains the values for each index in the array.

MDN documentation

Methods from Deref<Target = Object>

pub fn constructor(&self) -> Function

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

MDN documentation

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

👎Deprecated:

Use Object::hasOwn instead.

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

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

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

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

MDN documentation

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

pub fn to_string(&self) -> JsString

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

MDN documentation

pub fn to_js_string(&self) -> JsString

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

MDN documentation

pub fn value_of(&self) -> Object

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

MDN documentation

Methods from Deref<Target = JsValue>

pub const NULL: JsValue

pub const UNDEFINED: JsValue

pub const TRUE: JsValue

pub const FALSE: JsValue

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.

pub fn is_string(&self) -> bool

Tests whether this JS value is a JS 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.

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.

pub fn is_null(&self) -> bool

Tests whether this JS value is null

pub fn is_undefined(&self) -> bool

Tests whether this JS value is undefined

pub fn is_null_or_undefined(&self) -> bool

Tests whether this JS value is null or undefined

pub fn is_symbol(&self) -> bool

Tests whether the type of this JS value is symbol

pub fn is_object(&self) -> bool

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

pub fn is_array(&self) -> bool

Tests whether this JS value is an instance of Array.

pub fn is_function(&self) -> bool

Tests whether the type of this JS value is function.

pub fn is_bigint(&self) -> bool

Tests whether the type of this JS value is bigint.

pub fn js_typeof(&self) -> JsValue

Applies the unary typeof JS operator on a JsValue.

MDN documentation

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

Applies the binary in JS operator on the two JsValues.

MDN documentation

pub fn is_truthy(&self) -> bool

Tests whether the value is “truthy”.

pub fn is_falsy(&self) -> bool

Tests whether the value is “falsy”.

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

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

MDN documentation

pub fn bit_not(&self) -> JsValue

Applies the unary ~ JS operator on a JsValue.

MDN documentation

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

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

MDN documentation

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

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

MDN documentation

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

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

MDN documentation

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

Applies the binary < JS operator on the two JsValues.

MDN documentation

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

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

MDN documentation

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

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

MDN documentation

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

Applies the binary > JS operator on the two JsValues.

MDN documentation

pub fn unchecked_into_f64(&self) -> f64

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

MDN documentation

Trait Implementations

impl AsRef<Array> for SpawnArgs

fn as_ref(&self) -> &Array

Converts this type into a shared reference of the (usually inferred) input type.

impl AsRef<JsValue> for SpawnArgs

fn as_ref(&self) -> &JsValue

Converts this type into a shared reference of the (usually inferred) input type.

impl AsRef<SpawnArgs> for SpawnArgs

fn as_ref(&self) -> &SpawnArgs

Converts this type into a shared reference of the (usually inferred) input type.

impl Clone for SpawnArgs

fn clone(&self) -> SpawnArgs

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for SpawnArgs

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Deref for SpawnArgs

type Target = Array

The resulting type after dereferencing.

fn deref(&self) -> &Array

Dereferences the value.

impl ErasableGeneric for SpawnArgs

type Repr = JsValue

The singular concrete type that all generic variants can be transmuted on

impl From<&[&str]> for SpawnArgs

fn from(list: &[&str]) -> Self

Converts to this type from the input type.

impl From<&[String]> for SpawnArgs

fn from(list: &[String]) -> Self

Converts to this type from the input type.

impl From<JsValue> for SpawnArgs

fn from(obj: JsValue) -> Self

Converts to this type from the input type.

impl From<SpawnArgs> for Array

fn from(obj: SpawnArgs) -> Array

Converts to this type from the input type.

impl From<SpawnArgs> for JsValue

fn from(obj: SpawnArgs) -> JsValue

Converts to this type from the input type.

impl From<Vec<&str>> for SpawnArgs

fn from(list: Vec<&str>) -> Self

Converts to this type from the input type.

impl FromWasmAbi for SpawnArgs

type Abi = <JsValue as FromWasmAbi>::Abi

The Wasm ABI type that this converts from when coming back out from the ABI boundary.

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

Recover a Self from Self::Abi.

impl IntoJsGeneric for SpawnArgs

where SpawnArgs: JsGeneric,

type JsCanon = SpawnArgs

The canonical JsGeneric form of this type.

fn to_js(self) -> SpawnArgs

Produce the canonical JsGeneric value for self.

impl<'a> IntoWasmAbi for &'a SpawnArgs

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

The Wasm ABI type that this converts into when crossing the ABI boundary.

fn into_abi(self) -> Self::Abi

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

impl IntoWasmAbi for SpawnArgs

type Abi = <JsValue as IntoWasmAbi>::Abi

The Wasm ABI type that this converts into when crossing the ABI boundary.

fn into_abi(self) -> Self::Abi

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

impl JsCast for SpawnArgs

fn instanceof(val: &JsValue) -> bool

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

fn unchecked_from_js(val: JsValue) -> Self

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

fn unchecked_from_js_ref(val: &JsValue) -> &Self

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

fn has_type<T>(&self) -> bool

where T: JsCast,

Test whether this JS value has a type T.

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.

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.

fn unchecked_into<T>(self) -> T

where T: JsCast,

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

fn unchecked_ref<T>(&self) -> &T

where T: JsCast,

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

fn is_instance_of<T>(&self) -> bool

where T: JsCast,

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

fn is_type_of(val: &JsValue) -> bool

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

impl LongRefFromWasmAbi for SpawnArgs

type Abi = <JsValue as LongRefFromWasmAbi>::Abi

Same as RefFromWasmAbi::Abi

type Anchor = SpawnArgs

Same as RefFromWasmAbi::Anchor

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

Same as RefFromWasmAbi::ref_from_abi

impl OptionFromWasmAbi for SpawnArgs

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.

impl<'a> OptionIntoWasmAbi for &'a SpawnArgs

fn none() -> Self::Abi

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

impl OptionIntoWasmAbi for SpawnArgs

fn none() -> Self::Abi

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

impl PartialEq for SpawnArgs

fn eq(&self, other: &SpawnArgs) -> bool

Tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl Promising for SpawnArgs

type Resolution = SpawnArgs

The type that this value resolves to.

impl RefFromWasmAbi for SpawnArgs

type Abi = <JsValue as RefFromWasmAbi>::Abi

The Wasm ABI type references to Self are recovered from.

type Anchor = ManuallyDrop<SpawnArgs>

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.

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

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

impl WasmDescribe for SpawnArgs

fn describe()

impl Eq for SpawnArgs

impl StructuralPartialEq for SpawnArgs

impl UpcastFrom<SpawnArgs> for Array

impl UpcastFrom<SpawnArgs> for JsOption<Array>

impl UpcastFrom<SpawnArgs> for JsOption<SpawnArgs>

impl UpcastFrom<SpawnArgs> for JsValue

impl UpcastFrom<SpawnArgs> for SpawnArgs