Nullable.Extensions | extension methods to help | Functional Programming library

Converts a T into a T?. Implemented for completeness. Most of the time the implicit conversions from T to T? will be sufficient. Evaluates whether the T? has a value. If so, it is simply forwarded untouched. When it's null the onNull function will be evaluated to calculate a replacement value. The result of onNull() might also be null. Else() is useful when implementing simple error handling. Its advantage over Switch() and ?? being that it can be used in the middle a method chain rather than only at the end of one. Creates a nullable type from a value. Make sure to place the using static ... inside your own namespace. Otherwise you will have to specifiy T explicitly (e.g. Nullable<int>(13)). Implemented for completeness. Most of the time the implicit conversions from T to T? will be sufficient. Creates a null of the specified type. Implemented for completeness. Most of the time the explicit and implicit conversions from null to T? should be sufficient. Alias for Map(). Also enables LINQ's query syntax for T?. Enables LINQ's query syntax for T?. Switches on a nullable type and returns the result of one the provided functions. The notNull function is executed in case the T? is not null. The isNull function otherwise. Switch() is supposed to be used to terminate a chain of T? extension methods. It shouldn't be needed too often, though. Most of the time the null-coalescing operator ?? should be sufficient. Executes a side-effect in case the T? has a value and then returns it unchanged. This works similar to tapping a phone line. Also useful during debugging, because it can be safely added to method chains for additional break points. Converts T? into an IEnumerable<T> with a single item in case the T? has a value. Otherwise the IEnumerable<T> will be empty. Converts a singleton IEnumerable<T> into a T? that is null case the IEnumerable<T> is empty. Otherwise the result will be the IEnumerable<T>'s only item. Throws when the IEnumerable<T> contains more than one item. Alias for Filter(). Also enables LINQ's query syntax for T?.