# RPN Virtual Calculator

A browser-friendly RPN calculator built around a small, generic JavaScript API.

## Goal

This project defines a reusable RPN calculator engine with:

- a simple stack-based public API
- configurable numeric and UI behavior
- centralized command metadata
- a browser demo that uses the same public API as any consumer code

## Package contents
- `rpn-calculator.js`: calculator engine
- `rpn-example.html`: example browser interface

## Main features
- Single JavaScript class
- Configurable stack size (`maxSize`, default: `2048`)
- Configurable numeric base (`base`, default: `10`)
- Configurable angle mode (`angleMode`, default: `deg`)
- Optional command filtering through `enabledCommands`
- Generic public API centered on:
  - `push`
  - `pop`
- `clear`
  - `swap(index1, index2)`
  - `remove(index)`
  - `edit(index)`
  - `isValidIndex(index)`
  - `input(command)`
  - `command(name, ...args)`
- `inputValue` is kept as a string to preserve future input formats
- `isEditing` is exposed as a boolean state
- All supported commands are described in one centralized dictionary
- Supported categories are limited to:
  - `Stack`
  - `Arithmetic`
  - `Trigonometry`

## Basic usage

### In a browser