@lzwme/asmd-calc

简体中文

A short and concise JavaScript library for the four fundamental operations of arithmetic, which supports the addition, subtraction, multiplication and division calculation of floating-point precision.

Features

• Short and sharp. It only includes the calculation of addition, subtraction, multiplication and division. The core code is less than 100 lines. There is no other dependency.
• High execution performance. Only the four operations that can be accurately expressed by the front end are considered to realize simple logic and better execution performance than the open source library with rich and complex functions (see Benchmark for details).
• Accurate and stable. The accumulation of many years of practical experience in the development of several financial trading systems covers various common calculation use case error scenarios.

Not Applicable

• For numerical processing involving very large numbers that front-end can not be accurately represented.
• Complex mathematical scientific calculation.

These libraries are recommended:

• math.js
• decimal.js
• calculatorjs
• bignumber.js
• big.js/。

Install

# npm
npm i @lzwme/asmd-calc
# yarn
yarn add @lzwme/asmd-calc
# pnpm
pnpm add @lzwme/asmd-calc

Useage

1. Calculation example using simple tool method

es module

import { add } from '@lzwme/asmd-calc';

console.log(add(0.1, 0.2, 0.3));
// => 0.6

commonjs

const calc = require('@lzwme/asmd-calc');

console.log(calc.add(0.1, 0.2, 0.3));
// => 0.6

2. Calculation example using chain operation

es module

import { AsmdCalc } from '@lzwme/asmd-calc';

const a = new AsmdCalc(0);
console.log(+a.add(0.1).add(0.2, 0.3));
// => 0.6

const b = new AsmdCalc(0.3);
  b.add(0.1, 0.2)
    .add(0.1)
    .sub(0.1, 0.2)
    .sub(0.1)
    .div(0.3)
    .mul(0.3);
console.log(+b);
// => 0.3
console.log(b.value);
// => 0.3

commonjs

const AsmdCalc = require('@lzwme/asmd-calc').AsmdCalc;

const calc = new AsmdCalc(0);
console.log(calc.add(0.1).add(0.2, 0.3));
// => 0.6

API

• add(...args); - Addition
• sub(...args); - Subtraction
• mul(...args); - Multiplication
• div(...args); - Division
• keepDotLength(value, len, isRounding = false): number; - Keep N decimal places
• toFixed(value, len): string; - Similar to Number.prototype.toFixed, but fixed precision of the result
• getDecimalLen(num): number; - Get the decimal length
• toNonExponential(num): string; - Convert to string format of unscientific counting method

Development and testing

• Development

pnpm install
pnpm start

• Testing

npm test
npm run benchmark

• Build

npm run build

Benchmark

npm run benchmark

See：Benchmark

The following results are the time-consuming comparison of executing 10000 * N times on the same machine:

type/times	jsRaw	asmd-calc	mathjs
add-10000	19.225ms	169.535ms	415.145ms
sub-10000	16.269ms	34.827ms	171.263ms
mul-10000	18.518ms	51.625ms	235.868ms
div-10000	27.025ms	79.504ms	300.706ms

Pre execution of 1000000 times and then stats time-consuming of execution of 10000 * N times:

type/times	jsRaw	asmd-calc	mathjs
add-10000	7.768ms	155.836ms	362.819ms
sub-10000	8.339ms	25.147ms	155.611ms
mul-10000	9.995ms	35.685ms	224.357ms
div-10000	15.666ms	77.407ms	280.322ms

References

• 754-2008 – IEEE Standard for Floating-Point Arithmetic
• Floating Point Math – https://0.30000000000000004.com
• 确保前端 JavaScript 浮点数精度的四则运算方法

License

@lzwme/asmd-calc is released under the MIT license.

该插件由志文工作室开发和维护。