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Design Patterns
Behavioural Patterns
Observer Pattern

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Q 01/ 04IntermediateQuestion 1 of 4. 0 correct, 0 incorrect.

Objects register with a subject, and the subject calls each of them when its state changes. Which pattern is this?

Observer

Mediator

Chain of Responsibility

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For Hugin I fear lest he come not home, But for Munin my care is more.

Grímnismál 20 · tr. Bellows, 1923

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