Retrieve available currencies in Amatino Swift - A double-entry accounting library for iOS & MacOS

retrieveGlobalUnits.swift

// Amatino Swift: https://github.com/amatino-code/amatino-swift
// Double entry accounting API

try GlobalUnitList.retrieve(
    session: session,
    callback: { (error: Error?, units: GlobalUnitsList?) in
        guard error == nil else {
            // Handle errors
        }
        guard currencies: GlobalUnitList = units else {
            // Should never happen, but accidentally
            // unwrapping nil angers the startup gods
        }
        // Do cool stuff with our shiny currency list
        print("Retrieved \(currencies.count) currencies")
        return
})

The session instance used in this example may be seen in the Create Session gist