Behavioral patterns

Iterator

Walk through a collection's elements one by one WITHOUT exposing how the collection stores them, and support multiple independent walks at once. An animated lesson where the diagram draws itself as the design grows.

  • Lesson 7 of 10
  • Animated diagrams
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Behavioral patterns

  1. 1Strategy
  2. 2Observer
  3. 3State
  4. 4Command
  5. 5Chain of Responsibility
  6. 6Template Method
  7. 7Iterator
  8. 8Mediator
  9. 9Memento
  10. 10Visitor
10 lessons, each with diagrams that draw themselves.

What you will learn

  • The idea: walk without looking inside
  • An analogy: the channel-up button
  • The mechanics: hasNext() and next()
  • External vs internal iterators
  • Why it pays off
  • Fail-fast and concurrent modification

More low-level design

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Sign in to open itSee plans

DSA comes with the all labs plan and every ChaiCode batch.