a := #(1 'hi' 3.14 1 2 (4 5))
(a at: 3) displayNl        "3.14"
(a reverse) displayNl      "((4 5) 2 1 3.14 'hi' 1)"
(a asSet) displayNl        "Set(1 'hi' 3.14 2 (4 5))"
.
hash := Dictionary from: { 'water' -> 'wet'. 'fire' -> 'hot' }.
hash at: 'fire' displayNl.     "Prints:  hot"
hash keysAndValuesDo: [ :k :v | ('%1 is %2' % { k. v }) displayNl ].
