private static bool Add(string[] fields)
{
if (fields[0] != "add")
{
return(false);
}
if (fields.Length < 2)
{
return(false);
}
string name = fields[1] == null ? null : fields[1];
Measure qty = null;
if (fields.Length > 2 && fields[2] != null)
{
double amt;
if (!double.TryParse(fields[2], out amt))
{
return(false);
}
string units = null;
if (fields.Length > 3 && fields[3] != null)
{
units = fields[3];
}
qty = new Measure(amt, units);
}
shoppingList.Add(name, qty);
Console.Out.WriteLine($"Successfully added '{name}': {qty}.");
return(true);
}