March 2019
Intermediate to advanced
350 pages
7h 28m
English
Content preview from React Design Patterns and Best Practices - Second Edition
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shouldComponentUpdate
For many developers, the way the reconciler algorithm works is confusing. They often think that since React is smart enough to find out the shortest path to apply the changes to the DOM, the render methods of the components that are not changed do not ever get called. That's unfortunately far from being true.
In fact, to find out the necessary steps to reduce the DOM operations, React has to fire the render methods of all the components and compare the results with the previous ones.
If nothing changes, no changes will be made in the DOM, which is great. But if our render methods do complex operations, React will take some time to figure out that no operations have to be done, which is not optimal.
We surely want our ...
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