using uCalcSoftware;

var uc = new uCalc();
var tokens = uc.ExpressionTokens;

// There is only one Alphanumeric token, so index 1 is out of bounds.
var outOfBoundsToken = tokens.ByType(TokenType.AlphaNumeric, 1);

Console.WriteLine($"Is token empty? {outOfBoundsToken.IsEmpty()}");
Console.WriteLine($"Was token found? {! outOfBoundsToken.IsProperty(ItemIs.NotFound)}");