So implement four of them, and you will know them all! First Forth with indirect threaded code, second Forth with direct threaded code, third Forth with subroutine threaded code, and the final fourth with token threaded code.
I thought this was going to be a pun on the word "fourth", disappointed when I got to "final".
I thought this was going to be a pun on the word "fourth", disappointed when I got to "final".