node-evaluator/index.js

A simple, easy, ultra light evaluator for mathematical calculations

/**
 * @param {string} expression - A valid math expression 
 * @returns {promise} Result of expression
**/
module.exports=e=>new Promise((r,n)=>{/^ *\d*((\.\d+)?| *) *(\+|\-|\*{1,2}|\/|\%) *\d*((\.\d+)?| *) *$/.test(e)?r(eval(e)):n("Invalid expression provided.")});