0.0.3 • Published 9 years ago
rpn-calculator v0.0.3
RPN calculator
Reverse Polish notation (RPN) is a mathematical notation in which every operator follows all of its operands, in contrast to Polish notation, which puts the operator in the prefix position. It is also known as postfix notation and is parenthesis-free as long as operator arities are fixed.
Installation
npm install rpn-calculatorUsage
var calculator = require('rpn-calculator');
// 1 + 2 = 3
calculator('1 2 +'); // 3
// 1 + 2 - 3 = 0
calculator('1 2 + 3 -'); // 0
// (1 + 2) * 3 = 9
calculator('1 2 + 3 *'); // 9Supports scientific notation:
calculator('1e2 1e-2 +'); // 100.01Available operators
All operators replicate the default JavaScript behavior except min and max
which are limited to 2 arguments to satisfy the default arity of RPN calculator.
| operator | operation | example |
|---|---|---|
+ | addition | 1 2 + = 3 |
- | subtraction | 1 2 - = -1 |
* | multiplication | 2 3 * = 6 |
/ | division | 7 2 / = 3.5 |
% | modulus | 12 5 % = 2 |
pow | exponentiation | 7 2 pow = 49 |
max | maximum of two | 1 2 max = 2 |
min | minimum of two | 1 2 min = 1 |
& | bitwise AND | 15 9 & = 9 |
| | bitwise OR | 15 9 | = 15 |
^ | bitwise XOR | 15 9 ^ = 6 |
<< | left shift | 9 2 << = 36 |
>> | sign-propagating right shift | 9 2 >> = 2 |
>>> | zero-filled right shift | 9 2 >>> = 2 |
Tests
npm install && npm test