Application Architecture with React: Rethinking Flux

Re:Application Architecture with React: Rethinking Flux by Cshelton on Monday September 14, 2015 @09:59AM (#10215065)

When you use Immutable JS, you are taking a slight performance hit. You are creating a new object every time you change anything and returning it. But the benefit of not having to worry about unexpected changed or sometimes referencing something you didn't mean too is great.

The added performance can come from the equality checks. Like, do not do anything if newState === oldState. This has added benefit with something like React where you can use shouldCOmponentUpdate, which we returned false, will not call the render function. It can increase performance drastically on complicated things.

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Re:Application Architecture with React: Rethinking Flux by woah on Monday September 14, 2015 @01:28PM (#10216218)

I think you know this, but just so that nobody gets the wrong idea- the new object created only uses as much memory as the difference between the new object and the old one. Immutablejs keeps track of the diffs and presents an interface to something that acts like a whole new object but consists of the old object + diffs.

So if you are replacing some in-place array mutation with Immutablejs code, this will use slightly more memory. However, if you are replacing native .map, .reduce, or .filter code with the equivalent Immutablejs, you will actually use less memory, because the built in methods clone the entire object.

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