Pipe transform uses syntax of list comprehension:
[pipe||Arg, ...]Arg (first element) is passed as is, the rest are transformed into function calls.
Arg and every call result become first argument of the next call:
[pipe||x, fn(y)] => fn(x, y)
[pipe||x, fn(y), fn(z)] => fn(fn(x, y), z)
Functions are called from left to right
f- local functionm:f- external function
-module(foo).
-compile({parse_transform, pipe_transform}).
-export([f/0]).
f() -> [pipe||1, inc, mul(2)].
inc(X) -> X + 1.
mul(X, K) -> X * K.