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agentultra.com
| | degoes.net
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| | Functional programming has a bit of jargon, but that doesn't have to stop you from understanding core concepts
| | noelwelsh.com
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| | [AI summary] The post explains functional programming as a hypothesis about software quality centered on local reasoning and composition rather than just language features like immutability, using examples from Scala, TypeScript, and Haskell.
| | henko.net
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| | A selection of functional programming concepts that I feel are helpful to all developers.
| | www.jeremykun.com
16.3 parsecs away

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| Previously in this series we've seen the definition of a category and a bunch of examples, basic properties of morphisms, and a first look at how to represent categories as types in ML. In this post we'll expand these ideas and introduce the notion of a universal property. We'll see examples from mathematics and write some programs which simultaneously prove certain objects have universal properties and construct the morphisms involved.