public static void _main()
{
WriteLine("Enter a currency pair like 'EURUSD', or 'q' to quit");
for (string input; (input = ReadLine().ToUpper()) != "Q";)
{
WriteLine(FxApi.GetRate(input));
}
}
static (decimal, Rates) GetRate(string ccyPair, Rates cache)
{
if (cache.ContainsKey(ccyPair))
{
return(cache[ccyPair], cache);
}
var rate = FxApi.GetRate(ccyPair);
return(rate, cache.Add(ccyPair, rate));
}
static void MainRec(string message, Rates cache)
{
WriteLine(message);
var input = ReadLine().ToUpper();
if (input == "Q")
{
return;
}
GetRate(pair => () => FxApi.GetRate(pair), input, cache).Run().Match(
ex => MainRec($"Error: {ex.Message}", cache),
result => MainRec(result.Quote.ToString(), result.NewState));
}