ALL collections understand
add: answers with its argument NOT with the amended collection.
Bag - a Set where it will count the number of instances of each member ?
(An unordered collection of objects. i.e. a set with a memory. if the same object is added twice, it will report that the element has been stored twice.)
A Set provides an unordered collection of unique elements. i.e. if you add a duplicate of an existing item, nothing happens.
IdentitySet (and IdentityDictionary) has integers or Symbols as the key values
Collections can be
sequenced - they proceed from first: to last:
indexed - they also respond to at: (aNumber or aSymbol)
i.e. they have an integer key
keyed: they have an index which is an i
unordered - i.e. they do not respond to
Arrays are of fixed size, and is indexed.
Indexed collections are ones which have an Integer number as their index - i.e. an integer will allow you to access a specific member.
There is a Matrix Class for multi-dimensional arrays
2D = table
3D = volume (GRL term)
There is also SparseLargeTable and its subClass SparseLargeArray
OrderedCollection and its subclass, SortedCollection
Which one is a Dictionary? Neither. Class Dictionary (and class SmallDictionary) are dictionaries.
Dictionaries are keyed to a string value.
Only one entry is allowed for each string value.