happycalculator

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happycalculator

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calculator for natural formula like "1+2+3" for result 6 ,support simple code for calculator,that meas support variables for the calculator

happycalculator 최신버젼 다운로드

최종 버전 다운로드 (.zip)

// repository documentation

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# happycalculator [![Build Status](https://travis-ci.org/billyct/happycalculator.svg?branch=v1.3.0)](https://travis-ci.org/billyct/happycalculator)

![icon](https://raw.githubusercontent.com/billyct/happycalculator/master/icon.png)

calculator for natural formula like "1+2+3" for result 6,support custom function like sqrt(20) also whatever you want,support formulas loop,  like sqrt(sqrt(20+20))

[中文](https://github.com/billyct/happycalculator/blob/master/readme_zh.md)

## Install

``` $ npm install --save happycalculator ```

or bower

``` $ bower install --save happycalculator ``` and it will apply happycalculator global to you

## Usage
### base

```js
var happycalculator = require('happycalculator');
var formula = '20 * ( 10 + 20 ) / 20';
happycalculator.convert(formula);
//output: ['20', '*', '(', '10', '+', '20', ')', '/', '20']
happycalculator.shunt(formula);
//output: [ '20', '10', '20', '+', '*', '20', '/' ]
happycalculator.calculate(formula);
//output: 30
```
### advance
```js
//sqrt__custom is default seted to '$1*$2'

happycalculator.calculate('sqrt__custom(10)*20/20');
//output 100

happycalculator.addFormulas({'sqrt__custom' : '$1 + $1'}); //
happycalculator.calculate('sqrt__custom(10)*20/20');
//output 20
happycalculator.calculate(sqrt__custom('sqrt__custom(10))*20/20');
//output 40
happycalculator.removeFormulas(); //remove formulas added,and reset the formulas default
happycalculator.calculate('sqrt__custom(10)*20/20');
//output 100

happycalculator.addFormulas({'custom' : '$1 + $2 +$3'});
happycalculator.calculate('custom(10, 20, 30)')
//output 60

//support formulas loop
happycalculator.calculate('sqrt__custom(sqrt__custom(10))');
//output 10000
happycalculator.calculate('sqrt__custom(sqrt__custom(2+2))');
//output 256

//support sin,cos,tan,sqrt which was Math functions
happycalculator.calculate('sin(30)');
//output 0.5

```

#### support simple code
```js
var code = `sum = $1 + $2;
a = 2;
b = 3;
sum(a,b)+a;
a = 3;
a+b;`
calculator.parse(code);
//output ['(2+3)+2', '3+3']
calculator.calculateCode(code);
//output [7, 6]
```
and that's all simple code support right now

## API
### convert(string_infix)
return an array that split with "+-*/",and if the string with values(example:a,ab,cos(20)) also that will be ok

### shunt(string_infix)
return an array postinfx that with the [Shunting-yard Algorithm](https://en.wikipedia.org/wiki/Shunting-yard_algorithm) converted,the core code was written from [rosettacode](https://rosettacode.org/wiki/Parsing/Shunting-yard_algorithm#JavaScript) and i change some code for the project

### calculate(string_infix)
return the num calculated

### addFormulas(formulas)
add custom formulas to the calculator,and the formula rule is looks like that{'key' => '$1+$2+$3'},key(1,2,3),default formula function has sqrt:'$1*$1' right now,its working on

### removeFormulas()
remove all custom formulas you add in and defaults to the default project supported formulas

### parse(string_code)
return array of string_code parsed

### calculateCode(string_code)
return array of the result calculated by the string_code parsed

happycalculator

happycalculator 최신버젼 다운로드

오늘의 추천 프로젝트

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happycalculator

happycalculator 최신버젼 다운로드

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