Snippets created by Neil Danson
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Undoable Commands
A simple implementation of an Undoable Command, with a Document to hold a stack of actions. 2 examples of UndoableCommand are given - 1 allows property changes to be remembered, and another which allows the user to execute an action with a corresponding undo. Further examples could include CompositeUndoableCommands where the command is itself a list of commands.
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Like the snippet!Posted: 13 years ago by Neil Danson
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BDD without a framework
A Simple port of the Calculator BDD sample from http://cukes.info. Most BDD frameworks require attributes and shared state to run a test (I'm looking at you specflow!) As the test suite grows, the accidental complexity of different steps initialising (or not) class state becomes a huge problem, resulting in fragile tests. By accumulating state until the assertion, the tests become strongly typed and resilient to change. F#'s backtick methods combined with continuations and lightweight syntax can be taken to extremes to produce a lightweight internal DSL, with efficient results.
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Like the snippet!Posted: 9 years ago by Neil Danson