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What is a reaction?

A reaction responds to an occurance of an event by invoking a command.

When to use it?

Use this pattern every time something needs to happen in reaction to something else that happened before.

Want to give it a try?

Check out the quickstart for a quick example.

Or get started with the learning path, where you'll build both a transient reaction in lesson 8 and a guaranteed reaction in lesson 9.