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Update index.html #172

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2 changes: 1 addition & 1 deletion book/index.html
Original file line number Diff line number Diff line change
Expand Up @@ -1726,7 +1726,7 @@ <h2 id="observerpatternjavascript">

<ul>
<li><strong>Subject</strong>: maintains a list of observers, facilitates adding or removing observers</li>
<li><strong>Observer</strong>: provides a update interface for objects that need to be notified of a Subject's changes of state</li>
<li><strong>Observer</strong>: provides an update interface for objects that need to be notified of a Subject's changes of state</li>
<li><strong>ConcreteSubject</strong>: broadcasts notifications to observers on changes of state, stores the state of ConcreteObservers</li>
<li><strong>ConcreteObserver</strong>: stores a reference to the ConcreteSubject, implements an update interface for the Observer to ensure state is consistent with the Subject's</li>
</ul>
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