Javascript RPN calculators
These RPN calculators are programmable in Javascript, thus taking the vintage HP calculator paradigm and adding a modern language.
Rpn-calc

Here is the built in Javascript code editor.
Parameters to Javascript functions are taken off the RPN stack. Return values from Javascript functions are pushed onto the RPN stack.

https://abulka.github.io/jsrpncalc-web/
Rpn-calc2
A completely new implementation, also programmable in Javascript. Define interactive UI buttons and sliders.

