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The instance answered by the collect: method usually belongs to the
same class as the receiver, but there are exceptions. In the following,
for example, the receiver is an instance of the Interval class, but
the answer is an instance of the Array class, as demonstrated by the
class method, which identifies the class to which an instance
belongs.
Transcript show: (1 to: 5) class printString; cr.
Transcript show: ((1 to: 5) collect: [:x | x * x]) class printString
Transcript
Interval
Array