Functional Programming, Csharp, Dotnet, Software Development.
private const int MaxLength = 255; public (bool IsValid, string? Error) Validate(string email) { if (string.IsNullOrEmpty(email)) { return (false, "Email is empty"); } if (email.Length > MaxLength) { return (false, "Email is too long"); } if (email.Split('@').Length != 2) { return (false, "Email