string-math
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string-math is a module (function) that computes the [Number] result from the [String] arithmetical formula.
eval()"2+2" into [Number] formulas 2+2. Then it is performed as the common JavaScript arithmetic operation."2 + 2" //4
"3*(5-2)" //9
" 2.5 * 2.5 / .1" //62.5
"3.5+5*(-4-(3/(3+1)-12*3-.2*22)-16/4*12-5/(2)+3.5+2.5*(1.5-2*7))-16" //-225.5
".25e+2*10" //250
0.30000000000000004 return values) or to perform arithmetic formulas with big numbers, check out exact-math package. It implements string-math features as the exactMath.formula method.npm install string-math
var stringMath = require('string-math');
stringMath("--1") //1
stringMath("2/-2") //-1
stringMath("-5-5") //-10
<head>
<script src="./string-math.js"></script>
</head>
Any other dependencies are needed.
stringMath global Function from string-math.js.var result = stringMath("2+2");
| Chrome | Firefox | IE | Safari | Opera |
|---|---|---|---|---|
| yes | yes | yes | yes | yes |
> git clone https://github.com/devrafalko/string-math.git
> cd string-math
> npm install
> npm test
> npm test deep //displays error messages
stringMath(expression[,callback])expression [String][0-9] digits1.5, 0.5 or .5 decimal fractions-5, -.4, -5.55 negative values2e-2, .25e+12, -3e-10 exponential notation values* multiplication sign/ division sign+ plus sign- subtraction sign( and ) parenthesescallback [Function] (optional) (synchronous)callback argument is omitted and the expression is of incorrect type or is invalid, the Error object is thrown. If the callback is defined, the Error object is passed through the callback function, rather than being thrown.callback argument is defined, it is called with the following arguments:
errornull, if the expression is of correct type and is valid math formula.Error object.resultnull if the expression is of incorrect type or if the math formula is invalid.If the math formula is of correct type and is valid, it returns the [Number] result. Otherwise it returns null.
4(2+1); equals to 4*(2+1)2 * -2; equals to 2 * (-2)2 / -2; equals to 2 / (-2)+2 + 2; equals to 2 + 22 + +2; equals to 2 + 2-2 - -2 equals to -2 + 2-2 - +2 equals to -2 - 2-2 + -2 equals to -2 - 22 + 22 + ( -2 - -2) 2 + (+2 + +4 / -1) -.1 - -52 + 3e-5.25e+5 * -.25e-5-2 - - 25 + . 3.2 e-5, 2e - 5, 3e +10FAQs
Evaluates the result of the String arithmetical expression
The npm package string-math receives a total of 5,027 weekly downloads. As such, string-math popularity was classified as popular.
We found that string-math demonstrated a not healthy version release cadence and project activity because the last version was released a year ago. It has 1 open source maintainer collaborating on the project.
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