Self-contained JavaScript class
Configurable stack size (maxSize, default: 2048)
Configurable numeric base (base, default: 10)
Configurable angle mode (angleMode, default: deg)
Optional command enabling via enabledCommands
Generic public API centered on push, pop, clear, swap, remove, edit, isValidIndex, input, and command
inputValue stays a string to keep hexadecimal input possible later
isEditing tracks typed input mode
Operations are centralized with argCount, category, and aliases
Categories are limited to Stack, Arithmetic, and Trigonometry
Clear domain errors for invalid inputs
Degree-based trig demo in the example HTML

Quick start

In the browser

<script src="rpn-calculator.js"></script>
<script>
  const calc = new RpnCalculator();
  calc.input('1');
  calc.input('2');
  calc.command('enter');
  calc.command('add');
  console.log(calc.stack);
</script>

With options

const calc = new RpnCalculator({
  maxSize: 1024,
  base: 10,
  angleMode: 'deg',
  enabledCommands: ['add', 'sub', 'mul', 'div', 'enter', 'clear'],
});

Public API

Properties

stack: current stack, with the top item at index 0
inputValue: input text as a string
isEditing: whether input is currently being edited

Generic methods

push(value)
pop()
clear()
swap(index1, index2)
remove(index)
edit(index)
isValidIndex(index)
input(command)
command(name, ...args)

Supported commands

Stack

enter
dup
drop
swap
clear

Arithmetic

add / +
sub / -
mul / *
div / /
mod / %
pow / ^ / y^x
sqr
neg
sqrt
recip / 1/x
log
ln

Trigonometry

sin
cos
tan
asin
acos
atan

Important behavior

% behaves as the RPN percentage operator: a b % => (a * b) / 100
sqrt, asin, acos, log, and ln throw clear errors for invalid inputs
log uses Math.log10
ln uses Math.log
sin, cos, and tan convert degrees to radians in the default demo
asin, acos, and atan return degrees in deg mode

Example HTML

The example UI groups buttons into Stack, Arithmetic, and Trigonometry sections, and calls command(...) to execute operations.

License

To be completed according to your project.