youngguang / number-precision

🚀1K tiny & fast lib for doing addition, subtraction, multiplication and division operations precisely

number-precision

Perform addition, subtraction, multiplication and division operations precisely using javascript

Why

0.1 + 0.2 = 0.30000000000000004
1.0 - 0.9 = 0.09999999999999998
0.105.toFixed(2) = 0.1 // not 0.11

Install

npm install number-precision --save

Methods

NP.strip(num)         // strip a number to nearest right number
NP.plus(num1, num2, num3, ...)   // addition, num + num2 + num3, two numbers is required at least.
NP.minus(num1, num2, num3, ...)  // subtraction, num1 - num2 - num3
NP.times(num1, num2, num3, ...)  // multiplication, num1 * num2 * num3
NP.divide(num1, num2, num3, ...) // division, num1 / num2 / num3
NP.round(num, ratio)  // round a number based on ratio

Usage

import NP from 'number-precision'
NP.strip(0.09999999999999998); // =0.1
NP.plus(0.1, 0.2);             // =0.3 not 0.30000000000000004
NP.plus(2.3, 2.4);             // =4.7 not 4.699999999999999
NP.minus(1.0, 0.9);            // =0.1 not 0.09999999999999998
NP.times(3, 0.3);              // =0.9 not 0.8999999999999999
NP.times(0.362, 100);          // = 36.2, not 36.199999999999996
NP.divide(1.21, 1.1);          // =1.1 not 1.0999999999999999
NP.round(0.105, 2);            // =0.11 not 0.1

License

MIT