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F# 4.0 Design Patterns

You're reading from   F# 4.0 Design Patterns Solve complex problems with functional thinking

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Product type Paperback
Published in Nov 2016
Publisher Packt
ISBN-13 9781785884726
Length 318 pages
Edition 1st Edition
Languages
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Author (1):
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Gene Belitski Gene Belitski
Author Profile Icon Gene Belitski
Gene Belitski
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Toc

Table of Contents (14) Chapters Close

Preface 1. Begin Thinking Functionally 2. Dissecting F# Origins and Design FREE CHAPTER 3. Basic Functions 4. Basic Pattern Matching 5. Algebraic Data Types 6. Sequences - The Core of Data Processing Patterns 7. Advanced Techniques: Functions Revisited 8. Data Crunching – Data Transformation Patterns 9. More Data Crunching 10. Type Augmentation and Generic Computations 11. F# Expert Techniques 12. F# and OOP Principles/Design Patterns 13. Troubleshooting Functional Code

Exploring quotations and metaprogramming


The last feature I want to cover among the advanced patterns of F# use is Code Quotations (https://docs.microsoft.com/en-us/dotnet/articles/fsharp/language-reference/code-quotations). This feature is quite mind-bending, allowing you to work with the program code as if it is data, and evaluate these "program as data" pieces when needed and in the needed manner.

The feature review

Looking at this feature from the more operational angle, a program piece may be represented as an expression tree representing the code but without running the code generation off this representation. This allows for arbitrary execution behavior when the expression tree is to be evaluated. It can be evaluated as F# code or as source to generate JavaScript code or even as GPU-executed code or in any other feasible manner.

The cool thing about quoted expressions is that they are typed, they can be spliced together from parts, or they can be decomposed into parts using active patterns...

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