You think you've seen every variant of code highlighting, then you see this fun Atom style!
miniblog.
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I feel like enums/variants/tagged unions are underexplored in dynamically typed languages.
As soon as you see a pattern match for a given enum variant (e.g. colour::RED), your can IDE can be helpful if the enum definition changes. Normally I only get this with static typing.
-<>> (aka 'diamond wand') is a cute variant of threading macros, allowing you to specify where the arg is passed: