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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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Table of Contents (14) Chapters Close

Preface 1. Begin Thinking Functionally FREE CHAPTER 2. Dissecting F# Origins and Design 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

Basic sequence transformations


Let's revisit the functional solution of the sample problem from Chapter 1, Begin Thinking Functionally. It represents the common functional pattern of finding a given property of the collection as follows:

  • From the given string literal representing 1000 consecutive single digit characters, make a collection of the collections represented by chunks of just five consecutive single digit characters of the original collection. Each chunk takes the inner characters of a five character-wide stencil aligned first with the left-hand side border of the string literal. The stencil then gets moved to the right by a single character before extracting the next sub collection. This sliding of the stencil to the right is continued until the right-hand side borders of both the stencil and the literal get aligned. To be exact, the main sequence consists of 996 such five character sub sequences.

  • Note that the originally sought-for property of the maximal product of five consecutive...

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