Macros

Tele supports Erlang Macros. The definition and usage is similar as well.

You can read more about Erlang macros here.

Macros are used for a few purposes. One of them is like a constant:

define MAGIC_NUMBER: 42

Then when we want to use that macro it looks like this:

fun math_stuff():
  ?MAGIC_NUMBER + 2

Macros can also take parameters like a function.

Let's say we had some tuple shape we like but want to determine that static values later:

define MAGIC_TUPLE(a, b):
  #('a, a, 'b, b)

We can use this macro like this:

fun tuple_stuff():
  ?MAGIC_TUPLE(1, 2)

Would expand to:

fun tuple_stuff():
  #('a, 1, 'b, 2)

There are a number of uses for macros, but keep in mind these macros are less powerful than say Lisp's or Elixir's.