jdantonio/functional-ruby — pull request #12 by jdantonio (2014-08-08 18:34:23+00:00)
Title: Final var

A thread safe object that holds a single value and is "final" (meaning that the value can be set at most once after which it becomes immutable). The value can be set at instantiation which will result in the object becoming fully and immediately immutable. Attempting to set the value once it has been set is a logical error and will result in an exception being raised.