The first element returned by the iterator, if any, or null if this stream is empty. For a stream with an unstable iteration order, a different value might be produced each time first is evaluated.

The hash value of the value, which allows the value to be an element of a hash-based set or key of a hash-based map. Implementations must respect the constraint that:

• if x==y then x.hash==y.hash.

Therefore, a class which refines equals must also refine hash.

The last element returned by the iterator, if any, or null if this stream is empty. In the case of an infinite stream, this operation never terminates; furthermore, this default implementation iterates all elements, which might be very expensive.

Add the given element to this set, returning true if the element was not already a member of this set, or false otherwise.

Remove every element from this set, leaving an empty set with no elements.

A shallow copy of this collection, that is, a collection with identical elements which does not change if this collection changes. If this collection is immutable, it is acceptable to return a reference to this collection. If this collection is mutable, a newly instantiated collection must be returned.

Returns a new Set containing all the elements in this set that are not contained in the given Set.

Returns true if the given value belongs to this Category, that is, if it is an element of this Category, or false otherwise.

For most Categorys the following relationship is satisfied by every pair of elements x and y:

• if x==y, then x in category == y in category

However, it is possible to form a useful Category consistent with some other equivalence relation, for example ===. Therefore implementations of contains() which do not satisfy this relationship are tolerated.

Determine if two values are equal. Implementations should respect the constraints that:

• if x===y then x==y (reflexivity),
• if x==y then y==x (symmetry),
• if x==y and y==z then x==z (transitivity).

Furthermore it is recommended that implementations ensure that if x==y then x and y have the same concrete class.

A class which explicitly refines equals() is said to support value equality, and the equality operator == is considered much more meaningful for such classes than for a class which simply inherits the default implementation of identity equality from Identifiable.

Returns a new Set containing only the elements contained in either this set or the given Set, but no element contained in both sets.

The elements larger than the given value, sorted in ascending order.

Returns a new Set containing only the elements that are present in both this set and the given Set.

An iterator for the elements belonging to this stream.

The elements smaller than the given value, sorted in descending order.

Obtain a measure containing the mapped values starting from the given starting index (from), with the given length. If length<=0, the resulting measure is empty.

The measure should contain the given number (length) of elements of this stream, starting from the element at the given starting index (from), in the same order as they are produced by the iterator of the stream. In the case where the iterator would be exhausted before length elements are produced, the resulting measure contains only those elements which were produced before the iterator was exhausted, and the length of the measure is less then the given length.

When the given index does not belong to this ranged object, the behavior is implementation dependent.

Remove an element from this set, returning true if the element was previously a member of the set.

Obtain a span containing the elements between the two given indices.

The span should contain elements of this stream, starting from the element at the given starting index (from), and ending with the element at the given ending index (to), in the same order as they are produced by the iterator of the stream, except when the ending index occurs earlier than the starting index, in which case they occur in the opposite order.

When one or both of the given indices does not belong to this ranged stream, the behavior is implementation dependent.

Obtain a span containing the elements between the given starting index (from) and the last index of this ranged object.

The span should contain elements of this stream, starting from the element at the given starting index (from), in the same order as they are produced by the iterator of the stream.

When the given index does not belong to this ranged stream, the behavior is implementation dependent.

Obtain a span containing the elements between the first index of this ranged stream and given end index (to).

The span should contain elements of this stream, up to the element at the given ending index (to), in the same order as they are produced by the iterator of the stream.

When the given index does not belong to this ranged stream, the behavior is implementation dependent.

Returns a new Set containing all the elements of this set and all the elements of the given Set.