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.

In general, hash values vary between platforms and between executions of the same program.

Note that when executing on a Java Virtual Machine, the 64-bit Integer value returned by an implementation of hash is truncated to a 32-bit integer value by removal of the 32 highest order bits, before returning the value to the caller.

Returns a pretty-printed serialised JSON representation

The number of elements returned by the iterator of this stream, if the iterator terminates. In the case of an infinite stream, this operation never terminates.

Returns a serialised JSON representation

Remove every entry from this map, leaving an empty map with no entries.

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.

Determines if there is a value defined for the given key.

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.

Note that an implementation of equals() that always returns false does satisfy the constraints given above. Therefore, in very rare cases where there is no reasonable definition of value equality for a class, for example, function references (Callable), it is acceptable for equals() to be defined to return false for every argument.

Returns the value defined for the given key, or null if there is no value defined for the given key.

Returns an Array value.

Returns an Array value, unless the key does not exist, or the value is null.

Returns an Boolean value.

Returns an Boolean value, unless the key does not exist, or the value is null.

Returns an Float value.

Returns an Float value, unless the key does not exist, or the value is null.

Returns an Integer value.

Returns an Integer value, unless the key does not exist, or the value is null.

Returns an Object value.

Returns an Object value, unless the key does not exist, or the value is null.

Returns an String value.

Returns an String value, unless the key does not exist, or the value is null.

An iterator for the elements belonging to this stream.

Add an entry to this map, overwriting any existing entry for the given key, and returning the previous value associated with the given key, if any, or null if no existing entry was overwritten.

Add the given entries to this map, overwriting any existing entries with the same keys.

Remove the entry associated with the given key, if any, from this map, returning the value no longer associated with the given key, if any, or null if there was no entry associated with the given key.