procs.md

Procedures in the prac Programming Language

An example of declaring and defining a procedure:

proc hello do
  "hello world\n" . drop
end

As you can see, the procedure does not accept any arguments, you can see how to accept them in the next snippet.

proc print_sum
  int a
  int b
do
  a b + .
end

Here you can see an example of defining a procedure that accepts two arguments, sums them up and prints them.

What about manipulations with the stack?

Essentially, procedures in the language do not have access to the global stack, which means that you can manipulate with the global stack only by accepting arguments.

But what happens if you have remaining values at the end of the procedure, like in this procedure:

proc foo
  int a
  int b
do
  a b a b dup dup
end

Basically, all the leftovers will be dropped at the end of the procedure automatically, so it won't corrupt the stack