Rusty Change is a Rust crate that provides a function to calculate the optimal change for different currencies, taking into account the different denominations of tender.
use rusty_change::{calculate_change, CurrencyKind, Money};
let paid = vec![&Money { value: 1000, currency: CurrencyKind::Gbp }];
let price = 375;
let change = calculate_change(&paid, price);
assert_eq!(
change,
vec![
&Money { value: 200, currency: CurrencyKind::Gbp },
&Money { value: 200, currency: CurrencyKind::Gbp },
&Money { value: 200, currency: CurrencyKind::Gbp },
&Money { value: 50, currency: CurrencyKind::Gbp },
&Money { value: 20, currency: CurrencyKind::Gbp },
&Money { value: 5, currency: CurrencyKind::Gbp },
]
);Rusty Change currently supports the following currencies:
- British Pound (GBP)
- Euro (EUR)
- United States Dollar (USD)
For each supported currency, Rusty Change provides the tender denominations in the form of a static array of Money structs. These tenders can be accessed using the get_tender() method of the CurrencyKind enum.
Here's an example of how to access the British Pound Sterling tender:
use rusty_change::{CurrencyKind, BRITISH_STERLING_TENDER};
let tender = CurrencyKind::Gbp.get_tender();
assert_eq!(tender, &BRITISH_STERLING_TENDER);Contributions are welcome! Please feel free to open an issue or a pull request if you have any suggestions or improvements.