Arithmio

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A maths expression parser and calculator.

Converts infix to postfix expressions and calculates the result.

Installation

'arithmio' is available as an npm package:

$ npm install arithmio

or as a RESTful API at x.

Usage

evaluate(infixExpression: string): number

calculates the result of infixExpression.

convertInfixToPostfix(expression: string): string

returns a postfix string of expression

calculate(postfixExpression: string): number

calculates the result of postfixExpression

Basic example test file

var evaluate = require('arithmio').evaluate;  

/* es6 import
import { evaluate } from 'arithmio';
*/

const infixExpression = '1 + 1';

const result = evaluate(infixExpression); // 2

Operators

+

Adds the first operand to the second operand

-

Subtracts the first operand from the second operand.

*

Multiplies the first operand by the second operand.

/

Divides the first operand by the second operand.

^

Raises the first operand to the power of the second operand e.g. '10^6'.

Arithmetics

Shorthand to perform common arithmetic operations.

SQRT(n)

returns the square-root of n.

Constants

Shorthand to access mathmatical constants.

PI

returns the value of PI.

Helpers

SUM(x, y, z...)

Returns the sum of all operands passed.

Future development

• Logical operators
• Additional helper functions