This repl is a simple postfix algorithm. Most basic math operations should be postfixed properly.
To view this on TripleLog, click here.
This page outputs a postfixed array as well as step-by-step logs. Enter an expression in the input element at the top and it will be postfixed instantly. You can change this to only show what you want.
Edit the script.js file to change the algorithm. The algorithm is a bit more complicated than necessary to allow for the step-by-step output.
You can try to add support for more operations, make the code faster/better, or whatever.