ngOnChanges lifecycle hook in angular example

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A lifecycle hook is called when any data-bound property of a directive changes. Define an ngOnChanges() method to handle the changes.

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While I'm reading the doc, I can see a title "Class implementations". I need to know what's the purpose of this block. If I go through the pages of links under the title, I can't see anything related about that.
Could you explain it, please?

thirumanitheivarajan