Forth I assume uses reverse polish notation: arguments before the operator.

3 4 +

for example, would return 7.

zabzonk 4 days ago | parent | next [-]

> would return 7

more pedantically, it would push 7 onto the stack

even more pedantically, would remove 3 and 4 from the stack before pushing 7

	▲	DonHopkins 4 days ago \| parent [-]
		Even oddly more pedantically, that's the operand stack, not to be confused with the separate return stack. >R and R> move values between the two stacks. On the other hand, PostScript also has a dictionary stack, which you can use to implement a Smalltalk-like object oriented programming system. And its data types and executable code are basically polymorphic homoiconic JSON (like Lisp), not raw untyped bytes like FORTH. https://news.ycombinator.com/item?id=22456471 https://news.ycombinator.com/item?id=47812317

argimenes 4 days ago | parent | prev [-]

The stack is really a convenience that makes pipeline-driven programming possible in the language.

	▲	nagaiaida 4 days ago \| parent [-]
		somewhat relatedly, shell pipelining is very amenable to being massaged into (non stack-based) concatenative programming