Iterator in Smalltalk

1) Internal iterator - iterate inside the Iterator

• easy to use, not as powerful as external iterator
• works well because of blocks

employees do: [:each | each name printOn: aStream]

2) Combine Next() and CurrentItem() (Smalltalk Stream)

employeeStream := GeneralMotors employeeStream.

[employeeStream atEnd]

whileFalse:

[employeeStream next name printOn: aStream]

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