Direct Known Satisfying Interfaces: List<Element>, Map<Key,Item>

Abstract supertype of objects which associate values with keys. Correspondence does not satisfy Category, since in some cases—List, for example—it is convenient to consider the subtype a Category of its values, and in other cases—Map, for example—it is convenient to treat the subtype as a Category of its entries.

The item corresponding to a given key may be obtained from a Correspondence using the item operator:

value bg = settings["backgroundColor"] else white;

The get() operation and item operator result in an optional type, to reflect the possibility that there is no item for the given key.

By: Gavin
See also: Map, List, Category
Attributes
keysSource Code
shared default Category keys

The Category of all keys for which a value is defined by this Correspondence.

Inherited Attributes
Attributes inherited from: Object
Methods
definesSource Code
shared default Boolean defines(Key key)

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

definesAnySource Code

Determines if this Correspondence defines a value for any one of the given keys.

definesEverySource Code

Determines if this Correspondence defines a value for every one of the given keys.

getSource Code
shared formal Item? get(Key key)

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

itemsSource Code

Returns the items defined for the given keys, in the same order as the corresponding keys.

Inherited Methods
Methods inherited from: Object