The delete() method of WeakSet instances removes the specified element from this WeakSet.

The has() method of WeakSet instances returns a boolean indicating whether an object exists in this WeakSet or not.

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

The valueOf() method of Object instances converts the this value to an object. This method is meant to be overridden by derived objects for custom type conversion logic.

The resizable accessor property of ArrayBuffer instances returns whether this array buffer can be resized or not.

The endsWith() method of String values determines whether a string ends with the characters of this string, returning true or false as appropriate.

The filter() method of Iterator instances returns a new iterator helper that yields only those elements of the iterator for which the provided callback function returns true.

The reduce() method of Iterator instances is similar to Array.prototype.reduce: it executes a user-supplied "reducer" callback function on each element produced by the iterator, passing in the return value from the calculation on the preceding element. The final result of running the reducer across all elements is a single value.

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 toArray() method of Iterator instances creates a new Array instance populated with the elements yielded from the iterator.