https://github.com/nefe/number-precision

🚀1K tiny & fast lib for doing addition, subtraction, multiplication and division operations precisely
https://github.com/nefe/number-precision

floating-point number-converter rounding-error

Last synced: 5 days ago
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🚀1K tiny & fast lib for doing addition, subtraction, multiplication and division operations precisely

• Host: GitHub
• URL: https://github.com/nefe/number-precision
• Owner: nefe
• Created: 2017-08-21T09:03:31.000Z (over 7 years ago)
• Default Branch: master
• Last Pushed: 2024-06-11T02:08:46.000Z (8 months ago)
• Last Synced: 2025-01-14T00:07:50.013Z (12 days ago)
• Topics: floating-point, number-converter, rounding-error
• Language: TypeScript
• Homepage:
• Size: 325 KB
• Stars: 4,050
• Watchers: 58
• Forks: 328
• Open Issues: 13
• Metadata Files:
  • Readme: README.md

Awesome Lists containing this project

• awesome - nefe/number-precision - 🚀1K tiny & fast lib for doing addition, subtraction, multiplication and division operations precisely (TypeScript)
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• awesome-star-libs - nefe / number-precision

README

        
# number-precision [![npm version](https://badge.fury.io/js/number-precision.svg)](http://badge.fury.io/js/number-precision) [![Build Status](https://travis-ci.org/nefe/number-precision.svg)](https://travis-ci.org/nefe/number-precision) [![codecov](https://codecov.io/gh/nefe/number-precision/branch/master/graph/badge.svg)](https://codecov.io/gh/nefe/number-precision)

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

### Why

```js

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

```js

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

```js

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

```

PS: If you want to get rid of `XXX is beyond boundary when transfer to integer, the results may not be accurate`, use this at the beginning of your app to turn off boundary checking.

```js

NP.enableBoundaryChecking(false); // default param is true

```

### License

MIT