Toptal

In this article, I show how adopting declarative-style programming techniques judiciously can allow teams to create web applications that are easier to extend and maintain.

“…declarative programming is a programming paradigm that expresses the logic of a computation without describing its control flow.” —Remo H. Jansen, Hands-on Functional Programming with TypeScript

Like most problems in software, deciding to make use of declarative programming techniques in your applications requires carefully evaluating the tradeoffs. Check out one of our previous articles for an in-depth discussion of these.

Here, the focus is on how declarative programming patterns can be gradually adopted for both new and existing applications written in JavaScript, a language that supports multiple paradigms.

First, we discuss how to use TypeScript on both the back and front end to make your code more expressive and resilient to change. We then explore finite-state machines (FSMs) to streamline front-end development and increase

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