R is quite good at developing DSLs (quite Lispy), but Julia is even Lispy-er with a more flexible syntax and unicode identifiers. R, definitely, has a great statistical lineage, but that is also unfortunately what limits it from being as expressive - especially regarding new data types. No one in R creates their own domain-specific data types (that are performant as well) whereas this is the norm for the Julia ecosystem.

https://docs.julialang.org/en/v1/manual/metaprogramming/inde...