moneiro

moneiro is a JavaScript library that provides a type and a set of functions to support financial calculations.

Money, a type that the library provides, represents a fixed-point decimal number. This type is designed to be used in financial calculations, where rounding errors are not acceptable.

The moneiro's default exported function creates a new instance of Money from a number of minor units (e.g. cents) or another Money instance.

It also provides functions to create a Money instance from a variety of sources:

• from a string formatted as -1,234.56, use money.parse(value) or money.fromString(value).
• from a number of cents (or pense), use money.fromMinor(value).
• from a floating-point number, rounding to a lowest cent, use money.fromNumber(value).
• from a number of major units (dollars), use money.fromMajor(value).

It can holds values from -90071992547409.91 to 90071992547409.91.

A Money instance provides these operations:

• value - returns an integer representation of this Money instance.
• add(money1, money2, ...) - returns a new instance of Money with added amounts.
• distribute(recipients, unit) - divides the amount among recipients, proportionally to their shares. Operate in unit (default is minor).
• major() - returns a number of major units (dollars) as an integer JavaScript number, e.g. 1 for 1.23.
• minor() - returns a number of minor units (dollars) as an integer JavaScript number, e.g. 23 for 1.23.
• substract(money1, money2, ...) - returns a new instance of Money with substracted amounts.
• toNumber() - returns a floating-point number representation of the Money instance.
• toString() - returns string representation of the Money instance, e.g. -1,234.56.

moneiro also provides these constants:

• minor - indicates that computations are done in minor units (cents).
• major - indicates that computations are done in major units (dollars).
• zero - zero value.

In addition, moneiro provides these utility functions:

• isMoney(value) - returns true if value is an instance of Money.

Usage

Include moneiro:

var money = require('moneiro');

Create a Money instance, distribute it among shareholders, and sum up the result:

const amount = money.parse('1,204.20');

const dividends = amount.distribute([.6, .2, .2]);

const total =
  dividends.reduce(
    (sum, item) => sum.add(item),
    money.zero);