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ecalculator

v1.0.1

Published

浮点数运算器

Downloads

2

Readme

采用数组表达式的浮点数运算器,类似数学运算表达式语法,实现浮点数的连续运算

Install

  npm install ecalculator --save

示例

const calculator = require('ecalculator')

const result = calculator(0.1, '+', 0.2, '+', 0.3)
// 0.6 | 0.6000000000000001

const result = calculator(0.1, '+', 0.2, '+', [0.3, '*', 0.4])
// 0.42 | 0.42000000000000004

const result = calculator(0.1, '-', 0.2, '+', [0.3, '/', 0.4])
// 0.65 | 0.6499999999999999

const result = calculator(0.1, '+', 0.2, '+', [0.2, '*', [0.3, '/', 0.4]])
// 0.45 | 0.45000000000000007

优先级

注意:不支持自动提升乘除法优先级,可使用数组包裹方式声明优先级。

数组等同于括弧,与括弧运算符特性一致。

关于精度

加减乘除运算均采用放大至整型后求值,当除法运算无法被除尽时依然会产生多位小数,输出特性与普通计算器一致