npm package discovery and stats viewer.

Discover Tips

  • General search

    [free text search, go nuts!]

  • Package details

    pkg:[package-name]

  • User packages

    @[username]

Sponsor

Optimize Toolset

I’ve always been into building performant and accessible sites, but lately I’ve been taking it extremely seriously. So much so that I’ve been building a tool to help me optimize and monitor the sites that I build to make sure that I’m making an attempt to offer the best experience to those who visit them. If you’re into performant, accessible and SEO friendly sites, you might like it too! You can check it out at Optimize Toolset.

About

Hi, 👋, I’m Ryan Hefner  and I built this site for me, and you! The goal of this site was to provide an easy way for me to check the stats on my npm packages, both for prioritizing issues and updates, and to give me a little kick in the pants to keep up on stuff.

As I was building it, I realized that I was actually using the tool to build the tool, and figured I might as well put this out there and hopefully others will find it to be a fast and useful way to search and browse npm packages as I have.

If you’re interested in other things I’m working on, follow me on Twitter or check out the open source projects I’ve been publishing on GitHub.

I am also working on a Twitter bot for this site to tweet the most popular, newest, random packages from npm. Please follow that account now and it will start sending out packages soon–ish.

Open Software & Tools

This site wouldn’t be possible without the immense generosity and tireless efforts from the people who make contributions to the world and share their work via open source initiatives. Thank you 🙏

© 2024 – Pkg Stats / Ryan Hefner

@screeny05/ts-money

v0.6.2

Published

Typescript port of js-money. Implementation of the Money value object.

Downloads

25

Readme

TS Money

NPM version License: MIT

TS Money is a Typescript port of the great js-money package, which is an implementation of Martin Fowlers Money pattern.

Install

npm install ts-money

Usage

First we need to import the library.

import { Money, Currencies } from '@screeny05/ts-money'

or in javascript:

const TsMoney = require('@screeny05/ts-money')
const Money = TsMoney.Money
const Currencies = TsMoney.Currencies

Creating a new instance

There are multiple options of what to pass into the constructor to create a new Money instance:

  • amount as number, currency as string
  • amount as number, currency as object
  • object with amount and currency fields (only with fromInteger and fromDecimal methods)

Amounts can be supplied either as integers or decimal numbers.

Instances of Money are immutable and each arithmetic operation will return a new instance of the object.

When using decimals the library will allow only decimals with the precision allowed by the currencies smallest unit.

const fiveEur = new Money(500, Currencies.EUR)
const tenDollars = Money.fromInteger({ amount: 1000, currency: Currencies.USD })
const someDollars = Money.fromDecimal(15.25, 'USD')

// the following will fail and throw an Error since USD allows for 2 decimals
const moreDollars = Money.fromDecimal(15.3456, Currencies.USD)
// but with rounder function provider the following will work
const someMoreDollars = Money.fromDecimal(15.12345, 'USD', Math.ceil)

The Currency interface hold the following properties:

interface Currency {
    symbol: string
    name: string
    symbol_native: string
    decimal_digits: number
    rounding: number
    code: string
    name_plural: string
}

Ex:

import { Currency } from '@screeny05/ts-money'

const usd: Currency = {
    "symbol": "$",
    "name": "US Dollar",
    "symbol_native": "$",
    "decimal_digits": 2,
    "rounding": 0,
    "code": "USD",
    "name_plural": "US dollars"
}

Basic arithmetics

Arithmetic operations involving multiple objects are only possible on instances with the same currency and will throw an Error otherwise.

const fiveEur = new Money(500, Currencies.EUR) // 5 EUR

// add
fiveEur.add(new Money(250, Currencies.EUR)) // 7.50 EUR

// subtract 
fiveEur.subtract(new Money(470, Currencies.EUR)) // 0.30 EUR

// multiply
fiveEur.multiply(1.2345) // 6.17 EUR
fiveEur.multiply(1.2345, Math.ceil) // 6.18 EUR

// divide 
fiveEur.divide(2.3456) // 2.13 EUR
fiveEur.divide(2.3456, Math.ceil) // 2.14 EUR

Allocating funds

Will divide the funds based on the ratio without losing any pennies.

const tenEur = new Money(1000, Currencies.EUR)

// divide 10 EUR into 3 parts
const shares = tenEur.allocate([1,1,1]) 
// returns an array of Money instances worth [334,333,333]

// split 5 EUR 70/30
const fiveEur = new Money(500, Currencies.EUR)
const shares = fiveEur.allocate([70,30])
// returns an array of money [350,150]

Comparison and equality

Two objects are equal when they are of the same amount and currency. Trying to compare 2 objects with different currencies will throw an Error.

const fiveEur = new Money(500, Currencies.EUR)
const anotherFiveEur = new Money(500, Currencies.EUR)
const sevenEur = new Money(700, Currencies.EUR)
const fiveDollars = new Money(500, Currencies.USD)

fiveEur.equals(fiveDollars) // return false
fiveEur.equals(anotherFiveEur) // return true

fiveEur.compare(sevenEur) // return -1
sevenEur.compare(fiveEur) // return 1
fiveEur.compare(anotherFiveEur) // return 0

fiveEur.compare(fileDollars) // throw Error

fiveEur.greaterThan(sevenEur) // return false
fiveEur.greaterThanOrEqual(sevenEur) // return false
fiveEur.lessThan(sevenEur) // return true
fiveEur.lessThanOrEqual(fiveEur) // return true

Modifications

Some changes have been made compared with the javascript version:

Currencies object

Currencies are now exported in a standalone object:

import { Money, Currencies } from '@screeny05/ts-money'

Currencies.LTC = {
    symbol: "Ł",
    name: "Litecoin",
    symbol_native: "Ł",
    decimal_digits: 8,
    rounding: 0,
    code: "LTC",
    name_plural: "Litecoins"    
}

const m1 = new Money(12, 'LTC')
const m2 = new Money(234, Currencies.USD)
const m3 = new Money(543, Currencies.LTC)

Case insensitive currencies

Money accepts currencies as case insensitive:

const m1 = new Money(1, 'usd')
const m2 = new Money(2, 'USD')
const m3 = new Money(3, 'Usd')

Development

Install dependencies

npm install

Build library

npm run build

Run tests

npm test

License

The MIT License