The Reflect.ownKeys() static method returns an array of the target object's own property keys.

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

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

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The [Symbol.iterator]() method of Array instances implements the iterable protocol and allows arrays to be consumed by most syntaxes expecting iterables, such as the spread syntax and for...of loops. It returns an array iterator object that yields the value of each index in the array.

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The byteLength accessor property of TypedArray instances returns the length (in bytes) of this typed array.

The filter() method of TypedArray instances creates a copy of a portion of a given typed array, filtered down to just the elements from the given typed array that pass the test implemented by the provided function. This method has the same algorithm as Array.prototype.filter().

The toLocaleString() method of TypedArray instances returns a string representing the elements of the typed 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 ","). This method has the same algorithm as Array.prototype.toLocaleString().