money/money

This module provides types and methods for safe monetary calculations

Types

opaque </>

Monetary value that consists of a amount and its currency

pub opaque type Money

</>

Represents the error when trying to add two currencies that don’t match

pub type MoneyError {
  CurrencyMismatch(
    expected_currency: String,
    received_currency: String,
  )
}

CurrencyMismatch(
  expected_currency: String,
  received_currency: String,
)

Currencies that failed to match

</>

pub fn add(
  from: Money,
  other: Money,
) -> Result(Money, MoneyError)

Safely add two amounts of money and produce the new amount or, an error otherwise

</>

pub fn new(amount: Int, currency: String) -> Money

Produces a new Money ADT

</>

pub fn to_string(m: Money) -> String

Produce the m amount and its currency as a string