The reduce() method of TypedArray instances executes a user-supplied "reducer" callback function on each element of the typed array, in order, passing in the return value from the calculation on the preceding element. The final result of running the reducer across all elements of the typed array is a single value. This method has the same algorithm as Array.prototype.reduce().

The TypedArray.from() static method creates a new typed array from an array-like or iterable object. This method is nearly the same as Array.from().

The findIndex() method of TypedArray instances returns the index of the first element in a typed array that satisfies the provided testing function. If no elements satisfy the testing function, -1 is returned. This method has the same algorithm as Array.prototype.findIndex().

The intersection() method of Set instances takes a set and returns a new set containing elements in both this set and the given set.

The forEach() method of Set instances executes a provided function once for each value in this set, in insertion order.

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The isSubsetOf() method of Set instances takes a set and returns a boolean indicating if all elements of this set are in the given set.

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