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Learning codingFront End Web Development Techdegree Student 9,937 Points
Can someone elaborate on this video starting from 3.06?
I rewatched this part of the video twice and read the transcript and still don't understand what is happening. What I understand is that the goal is to minimize the times the Dom is searched. I understand that that would be more effective, but how is that more effective? Can someone elaborate on how this works?
Steven Parker228,025 Points
It's primarily a matter of efficiency.
As you suspected, fewer and/or more limited searches improve performance. It's faster to avoid replicating tasks than to do them repeatedly.
Also, there are many times when you have only a specific element to begin with, and DOM traversal will allow you to find a related element where no search could be constructed.