Clojure Cookbook

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Clojure Cookbook

Recipes for Functional Programming

Book DescriptionWith more than 150 detailed recipes, this cookbook shows experiencedClojure developers how to solve a variety of programming tasks with this JVM language. The solutions cover everything from building dynamic websites and working with databases to networkcommunication, cloud computing, and advanced testing strategies. And more than 60 of the world's best Clojurians contributed recipes.

Each recipe includes code that you can use right away, along with a discussion on how and why the solution works, so you can adapt these patterns, approaches, and techniques to situations not specifically covered in this cookbook.
Book Details
Publisher:        O'Reilly Media
By:        Luke VanderHart, Ryan Neufeld
ISBN:        978-1-44936-617-9
Year:        2014
Pages:        476
Language:        English
File size:        10.2 MB
File format:        PDF
Download:        

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1. Cleaning Up Whitespace in a String
   
2. by Ryan Neufeld
   
3. Problem
   
4. You need to clean up the whitespace in a string.
   
5. Solution
   
6. Use the clojure.string/trim function to remove all of the whitespace at the beginning and end of a string:
   
7. (clojure.string/trim " \tBacon ipsum dolor sit.\n")
   
8. ;; -> "Bacon ipsum dolor sit."
   
9. To manage whitespace inside a string, you need to get more creative. Use clojure.string/replace to fix whitespace inside a string:
   
10. ;; Collapse whitespace into a single space
    
11. (clojure.string/replace "Who\t\nput  all this\fwhitespace here?" #"\s+" " ")
    
12. ;; -> "Who put all this whitespace here?"
    
13. 
    
14. ;; Replace Windows-style line endings with Unix-style newlines
    
15. (clojure.string/replace "Line 1\r\nLine 2" "\r\n" "\n")
    
16. ;; -> "Line 1\nLine 2"

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1. Building a String from Parts
   
2. by Ryan Neufeld
   
3. Problem
   
4. You have multiple strings, values, or collections that you need to combine into one string.
   
5. Solution
   
6. Use the str function to concatenate strings and/or values:
   
7. (str "John" " " "Doe")
   
8. ;; -> "John Doe"
   
9. 
   
10. ;; str also works with vars, or any other values
    
11. (def first-name "John")
    
12. (def last-name "Doe")
    
13. (def age 42)
    
14. 
    
15. (str last-name ", " first-name " - age: " age)
    
16. ;; -> "Doe, John - age: 42"
    
17. Use apply with str to concatenate a collection of values into a single string:
    
18. ;; To collapse a sequence of characters back into a string
    
19. (apply str "ROT13: " [\W \h \y \v \h \f \  \P \n \r \f \n \e])
    
20. ;; -> "ROT13: Whyvhf Pnrfne"
    
21. 
    
22. ;; Or, to reconstitute a file from lines (if they already have newlines...)
    
23. (def lines ["#! /bin/bash\n", "du -a ./ | sort -n -r\n"])
    
24. (apply str lines)
    
25. ;; -> "#! /bin/bash\ndu -a ./ | sort -n -r\n"

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