Articulating the ineffable. Programming language theory 
cognitive psychology. PhD @Stanford
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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.
Macros in particular are interesting because I think they tend to matter more for statically typed languages, as a means of building abstractions that aren’t encodable in the type system.
I'm not sure that's entirely true. In OCaml, I feel like the abstraction tools are powerful in a way that in some sense reduces the need for macros.
Generators in Python get in the ballpark of delimited continuations, as does async/await.
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