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My name is Kyle Shevlin. I'm a software engineer, online instructor, and information curator among other things.

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State Machines

June 16, 2020
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Using `React.memo` to Avoid Unnecessary Rerenders

If your component is a pure function, i.e. given the same inputs you get the same output, you can wrap the component in `React.memo` to prevent the component from rerendering if `props` haven't changed.
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ReactJavaScript
June 11, 2020
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Recently, I spent an hour with one of my protégés demonstrating some common advanced techniques we use at Webflow. One of the techniques I showed them was memoization. Let's learn what memoization is, why you might use it, and how do we write it from scratch.
May 29, 2020
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No matter what it is you're building with React, when you boil it down, there are only three ways you can manage data in a React app: locally, parentally, and remotely.

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React
May 27, 2020
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The next part in our useReducer finite state machine journey is adding "guards". If you haven't read the previous posts in this collection, I encourage you to do so before reading ahead. Those posts are: How to Use useReducer as a Finite State Machine Adding Infinite States to a useReducer…

May 19, 2020
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Lately, I have had the opportunity to work on some new features at Webflow. It's exciting to build new things for your customers. It's also exciting because I've had the opportunity to finally dive head-first into React Hooks and learn and explore some new patterns. Some have been winners, some…

May 15, 2020
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Before reading this post, I encourage you to read How to Use useReducer as a Finite State Machine if you haven't already. In that post, I demonstrate how to make the React Hook useReducer behave like a finite state machine using a statechart-like graph. I'm going to expand upon that work today…

May 07, 2020
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Near the end of last year, I was doing prep work for my first workshop on state machines. In my research, I came across this simple, but effective graph editor: https://csacademy.com/app/graph_editor/ . I was impressed with how simple it was to represent a graph with just a few lines of text. On…

May 04, 2020
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I recently attempted to get XState into the Webflow codebase to manage some challenging and complex UIs but was met with resistance. No big deal, this is a part of work, consensus driving, disagreeing and committing, etc. If it hasn't happened to you yet, it will. One of the things you need when…

April 03, 2020
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This exists as a living document to define some guidelines regarding state machines and their usage. They are by no means exhaustive, but hopefully set you on the right path. It is _highly recommended_ that you read the XState docs for more information.
March 02, 2020
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I'm not sure when I first learned about "cyclomatic complexity". It's such an academic term that you can practically smell a classroom or library when you read or hear it. If I had understood the concept earlier in my career, I don't think I would have given it much thought. "I've got buttons to put…

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