This package parses basic mathematical formulae including variables into functions that will accept variable values and calculate results.

You can install this through npm:

npm install math-lexer

##Usage

var sysutil = require('util');
var mlexer = require('math-lexer');
var func = "3 * x^2 * y + 5 / (log(2 ^ (x / 2), 2) + 3 + abs(y^3))";
var realfunc = mlexer.parseString(func);

sysutil.puts(realfunc({x: 2, y: -1}));
//=> -11
sysutil.puts(realfunc({x: 2, y: 1}));
//=> 13

• Addition: a + b
• Subtraction: a - b
• Multiplication: a * b
• Division: a / b
• Exponentiation: a ^ b
• Exponentiation: exp(a)
• Natural Logarithm: ln(a)
• Logarithm: log(a, b) [b is the base]
• Absolute Value: abs(a)
• Square Root: sqrt(a)
• N-th Root: root(a, b) [b is the root degree]

Tests that exist are written for Nodeunit. To run them, install nodeunit and then run

nodeunit test.js