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During this talk, you will learn about the implementation and usage of a library, PDBP, written using the Dotty language, implementing FP, the language presented by John Backus during his Turing Award winning lecture.

Like FP:

• PDBP promotes a pointfree functional programming style

Unlike FP:

• PDBP separates the description of a program from possible meanings of the program
• PDBP can be extended with extra programming capabilities
• PDBP effects are pure (they are described rather than executed)

The foundations of the library are monads and arrows:

• monads promote a pointful programming style (they can programmed pointfree using Kleisli arrows)
• arrows promote a pointfree programming style (they can programmed pointful using arrow calculus)

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