Articulating the ineffable. Programming language theory 
cognitive psychology. PhD @Stanford
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With static vs dynamic discourse back in vogue, time to revive this post: concrete examples of patterns enabled by dynamic typing that are significantly harder in statically typed languages. https://willcrichton.net/notes/idioms-of-dynamic-languages/ …
In short: - Dynamically-sized heterogeneous data structures (eg JSON) - Ad hoc interfaces / structural subtyping - Reflection - Incomplete programs
Macros? Delimited continuations?
The set I highlighted isn’t exhaustive, but IMO the most important idioms for popular dynlangs in practice. Neither macros nor delimited continuations are going to appear in most Python/Javascript/etc codebases.
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