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A loop that iterates from 5 to 0, executed on a stack machine implemented in JavaScript.

One stack machine you might be familiar with is PostScript.

A stack machine works by pushing values onto a stack and performing operations on the values by popping them off the stack again.

It's very simple to write an interpreter for a stack machine. All you need is two arrays; one for the code and one for the stack.

Stack machines are very close to being idiomatic Turing machines.