Key Ideas

We saw a lot of different approaches to constructing apps in this book, but some of the big ideas were these:

  • Simplicity

  • Where does code run—on the client, a server, or a large cluster?

  • Composition—building up things from small pieces

  • Declaration over instruction—describing what to do, not how to do it

  • Type systems

  • State machines

  • Interactivity

Let’s recap these key ideas and the frameworks that most embodied them.


Simplicity is a desirable attribute because the human capacity for reasoning about software seems both finite and remarkably limited. Simplicity is often achieved by minimizing or transforming a problem or by focusing on specific parts of a solution. We saw both strategies in this book.

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