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The "Observable Demonstration 2" Lesson is part of the full, Reactive Angular 2 with ngrx course featured in this preview video. Here's what you'd learn in this lesson:
Scott live-codes another example the detects double clicks from a button. He utilizes the buffer() operator to add some lossless back-pressure to the stream. If more than two clicks are detected within the buffer, he displays the number of clicks on the page.