Calculator lib

Provides functions for evaluating infix (and RPN postfix) expressions, in JavaScript.

Source is in ES6, released as ES5. Transpiled using Babel.

Installation:

npm install calculator-lib

Usage:

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``javascript
const { evaluateInfix } = require('calculator-lib');

evaluateInfix('4 + 5'); // -> 9

evaluateInfix('2+3/(5^-1)*-1.5'); // -> -20.5
`

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Currently, operations are limited to the following:

- Multiplication (*)
- Division (/)
- Addition (+)
- Subtraction (-)
- Exponentiation (^)

Feel free to add more in a pull request! For example, trigonometric operations would come in handy...

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`javascript
const { evaluatePostfix } = require('calculator-lib');

evaluatePostfix('1 2 + 3 +'); // -> 6

evaluatePostfix('21 -3.2 *'); // -> -67.2
`

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`javascript
const { infixToPostfix } = require('calculator-lib');

infixToPostfix('21 ^ 3 2 - 10'); // -> '21 3 ^ 2 10 -'
``