Go Money

Go libraray to make working with money safer and easier!

package main

import "github.com/marvincaspar/go-money"

func main() {
    oneEuro := money.New(100, money.EUR())
    twoEuro, err := oneEuro.Add(oneEuro)

    if err != nil {
        log.Fatal(err)
    }

    parties, err := twoEuro.Allocate(1, 1, 1)

    if err != nil {
        log.Fatal(err)
    }

    parties[0].Display() // €0.67
    parties[1].Display() // €0.67
    parties[2].Display() // €0.66
}

Install

Get the package:

go get github.com/mc388/go-money

Usage

Initialzation

Initialze Money by using the smalles unit (e.g. 100 represents 1€) and one of the given currency factories.

euro := money.New(100, money.EUR())

Calculations

The following calculations are available:

• Add
• Subtract
• Multiply
• Allocate

Add

Use Add(money) to perform additions.

oneEuro := money.New(100, money.EUR())
twoEuro := money.New(200, money.EUR())
threeEuro, err := oneEuro.Add(twoEuro) // €3, nil
}

Subtract

Use Subtract(money) to perform substractions.

threeEuro := money.New(300, money.EUR())
twoEuro := money.New(200, money.EUR())
oneEuro, err := threeEuro.Subtract(twoEuro) // €1, nil
}

Multiply

Use Multiply(multiplicator) to perform multiplications.

twoEuro := money.New(200, money.EUR())
eightEuro, err := twoEuro.Multiply(4) // €8, nil
}

Allocate

Use Allocate(...ratioX) to allocate money by a given rations without loosing any cent.

oneEuro := money.New(100, money.EUR())
parties, err := oneEuro.Allocate(50, 50)

if err != nil {
    log.Fatal(err)
}

parties[0].Display() // €0.50
parties[1].Display() // €0.50
}

oneEuro := money.New(100, money.EUR())
parties, err := oneEuro.Allocate(1, 1, 1)

if err != nil {
    log.Fatal(err)
}

parties[0].Display() // €0.34
parties[1].Display() // €0.33
parties[2].Display() // €0.33
}

Comparison

The following comparion methods are available:

• Equals
• GreaterThan
• GreaterThanOrEqual
• LessThan
• LessThanOrEqual

Comparison can only performe between the same currency.

oneEuro := money.New(100, money.EUR())
twoEuro := money.New(200, money.EUR())
oneDollar := money.New(100, money.USD())

result1, err := oneEuro.GreaterThan(twoEuro) // false, nil
result2, err := oneEuro.LessThan(twoEuro) // true, nil
result3, err := oneEuro.Equals(oneDollar) // nil, error: Currency don't match
}

Tests

Run the unit tests with go test -v -covermode=count -coverprofile=coverage.out.

To view the coverage report use go tool cover -func=coverage.out