Rupert 'fildon' McKay
Rupert 'fildon' McKay's Blog

Rupert 'fildon' McKay's Blog

Rupert 'fildon' McKay

37 followers

Senior Software Engineer at Adidas. I love TypeScript/React/Jest and love to teach others about them. Check out more of my stuff over here:

https://fildon.me/

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Sorting in JavaScript

Jan 17, 20228 min read 928 views

JavaScript arrays have a builtin sort method, which mostly does what you expect: [1, 4, 2, 3].sort(); // [1, 2, 3, 4] ["d", "a", "b", "c"].sort(); // ['a', 'b', 'c', 'd'] But it has some quirks. For examples numbers are sorting as though they were s...

Sorting in JavaScript

What is a number?

Jan 3, 202210 min read 1.8K views

TL;DR: No datatype will ever be able to represent all numeric values perfectly Rounding errors will always exist JavaScript uses floating-point numbers which are sufficient for many use cases If this is not sufficient for your use case... JavaScript...

What is a number?

React Testing Library Recipes

Dec 4, 20216 min read 3.4K views

As long as I've been working in frontend development, the tools available for testing UIs have felt clunky, hard to use, and not filled me with confidence that they reflect real end-user experiences. I was especially tired of libraries that directly ...

React Testing Library Recipes

ESLint vs Prettier

Oct 9, 20214 min read 1.2K views

Photo by Nagesh Badu on Unsplash TL;DR: ESLint should identify semantic errors which require programmer intervention to fix, while prettier should identify text formatting errors which do not require programmer intervention to fix. The problem with S...

ESLint vs Prettier

TypeScript 4.4 > useUnknownInCatchVariables

Aug 30, 20214 min read 504 views

Photo by Ray Hennessy on Unsplash Key takeaways: The unknown type allows nothing. The any type allows everything JavaScript allows throwing any expression useUnknownInCatchVariables treats caught errors as unknown Last week I updated our main repo...

TypeScript 4.4 > useUnknownInCatchVariables

Publishing TypeScript React components to NPM

Jul 17, 20217 min read 317 views

Photo by Jess Bailey on Unsplash Publishing a TypeScript React component library to NPM Key takeaways: compile to a dist directory copy package.json and README.md files to the dist directory publish the dist directory If you get stuck or lost at a...

Publishing TypeScript React components to NPM