The combinators (operators on the stack) are often limited to 1, 2 or 3 parameters picked on the top of the stack. In Lisp you can write (+ 1 2 3 ... n). With

The combinators (operators on the stack) are often limited to 1, 2 or 3 parameters picked on the top of the stack. In Lisp you can write (+ 1 2 3 ... n). With a stack-based language, you might write: 1 //push 1 2 //... 3 + //add 3,2 and push 5 + //add 5,1 and push 6