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@bancoin/bignumber

v0.0.1

Published

Bancoin Library for work with Bignumber in javascript

Downloads

8

Readme

@bancoin/bignumber

A JavaScript library for arbitrary-precision decimal and non-decimal arithmetic.

Load

The library is the single JavaScript file bignumber.umd.js (or minified, bignumber.umd.min.js).

Browser:

<script src='path/to/bignumber.js'></script>

Node.js:

$ npm install @bancoin/bignumber
const { BigNumber } = require('@bancoin/bignumber');

ES6 module:

import { BigNumber } from "@bancoin/bignumber"

AMD loader libraries such as requireJS:

require(['@bancoin/bignumber'], function(BigNumber) {
    // Use BigNumber here in local scope. No global BigNumber.
});

Use

let x = new BigNumber(123.4567);
let y = BigNumber('123456.7e-3');
let z = new BigNumber(x);
x.eq(y) && y.eq(z) && x.eq(z);      // true

To get the string value of a BigNumber use toString() or toFixed(). Using toFixed() prevents exponential notation being returned, no matter how large or small the value.

let x = new BigNumber('1111222233334444555566');
x.toString();                       // "1111222233334444555566"
x.toFixed();                        // "1111222233334444555566"
Clone

Клонирует объект

const some = new BigNumber(1);
const clone = some.clone();
Add

Выполняет сложение

const bigNum = new BigNumber('100');
const result = bigNum.add('50'); // with method toFixed '150'
Sub

Вычитание

const bigNum = new BigNumber('100');
const result = bigNum.sub('50'); // with method toFixed '50'
Mul

Умножение

const bigNum = new BigNumber('100');
const result = bigNum.mul(2); // with method toFixed '200'
Div

Деление

const bigNum = new BigNumber('100');
const result = bigNum.div(2); //  with method toFixed '50'
Pow

Возведение в степень

const bigNum = new BigNumber('100');
const result = bigNum.pow(2); // with method toFixed '10000'
Abs

Модуль

const bigNum = new BigNumber('-100');
const result = bigNum.abs(); // with method toFixed 100
Mod

Остаток от деления

const bigNum = new BigNumber('100');
const result = bigNum.mod(10); // with method toFixed '0' 
RoundTo

Округляет. Принимает количество знаков после запятой после округлени и режим округления см тут: http://mikemcl.github.io/bignumber.js/#constructor-properties

const bigNum = new BigNumber('100');
const result = bigNum.roundTo(); //
Eq

Равенство

const bigNum = new BigNumber('100');
const result = bigNum.eq(100); // true
Lt

Меньше

const bigNum = new BigNumber('100');
const result = bigNum.lt(); //
Gt

Больше

const bigNum = new BigNumber('100');
const result = bigNum.gt(); //
Lte

Меньше или равно

const bigNum = new BigNumber('100');
const result = bigNum.lte(); //
Gte

Больше или равно

const bigNum = new BigNumber('100');
const result = bigNum.gte(); //
IsNaN

Проверяет на NaN

const bigNum = new BigNumber('100');
const result = bigNum.isNaN(); // false
IsFinite

Проверяет на Infinity (положительный и отрицательный)

const bigNum = new BigNumber('100');
const result = bigNum.isFinite(); //
IsZero

Проверяет на равенство нулю

const bigNum = new BigNumber('100');
const result = bigNum.isZero(); // false
IsPositive

Больше нуля

const bigNum = new BigNumber('100');
const result = bigNum.isPositive(); // true
IsNegative

Меньше нуля

const bigNum = new BigNumber('100');
const result = bigNum.isNegative(); // false
IsInt

Проверяет целое ли число

const bigNum = new BigNumber('100');
const result = bigNum.isInt(); //
GetDecimalsCount

Получаем количество занков после запятой у числа

const bigNum = new BigNumber('100');
const result = bigNum.getDecimalsCount(); // 0
IsEven

Четное

const bigNum = new BigNumber('100');
const result = bigNum.isEven(); // true
IsOdd

Не чётное

const bigNum = new BigNumber('100');
const result = bigNum.isOdd(); // false
ToBytes

Переводим число в байты со знаком (8 байт). Работает только с целыми числами.

const bigNum = new BigNumber('100');
const result = bigNum.toBytes();
ToFormat

Выводим число в строковом эквиваленте c с учётом настроек форматирования. Опционально принимает количество знаков округления, режим округления (как в roundTo) и настройки формата вывода.

const bigNum = new BigNumber('1000000.12312');
bigNum.toFormat(); // 1,000,000.12312 
bigNum.toFormat(2); // 1,000,000.12 
bigNum.toFormat(2); // 1,000,000.12 
bigNum.toFormat(2, 0); // 1,000,000.13 
bigNum.toFormat(2, 0, { groupSeparator: ' ' }); // 1 000 000.13 
ToFixed

Выводим число в строковом эквиваленте. Опционально принимает количество знаков округления и режим округления (как в roundTo)

const bigNum = new BigNumber('100');
const result = bigNum.toFixed(); //
ToNumber

Приводит к числу

const bigNum = new BigNumber('100');
const result = bigNum.toNumber(); //

Static Methods

fromBytes

Выводит знаковое число из байт. Работает только с 8 байтами.

const some = BigNumber.fromBytes(Uint8Array.from([1,2,3,4,5,6,7,8]));
max

Принимает любое количество аргументов, выбирает наибольшее число из аргументов

BigNumber.max(1, '2', new BigNumber(4)); // with method toFixed '4'
min

Принимает любое количество аргументов, выбирает наименьшее число из аргументов

BigNumber.min(1, '2', new BigNumber(4)); // with method toFixed '1'
sum

Принимает любое количество аргументов, складывает числа

BigNumber.min(1, '2', new BigNumber(4)); //with method toFixed '7'