[seanw444]

Similar in Nim as well.

[ckmate-king-2]

In Standard ML, you can do either 1+2 or op+(1, 2).

[int_19h]

R is much crazier than that because even things like assignment, curly braces, and even function definitions themselves are all function calls. It's literally the only primitive in the language, to which everything else ultimately desugars.