Clojure Goodness Notebook
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Clojure Goodness Notebook

Experience the Clojure programming language through code snippets

About the Book

In 2020 I started to write small blog posts about Clojure at Messages from mrhaki. The posts contain code samples of cool Clojure features I just didn't want to forget.

The Clojure Goodness Notebook contains the blog posts about Clojure previously mentioned on my blog. The posts have been edited slightly so they can be used for the book. The book gives a broad overview of all the great features we can find in the Clojure language.

About the Author

Hubert Klein Ikkink
Hubert A. Klein Ikkink (mrhaki)

Hello. I am a passionate Groovy and Java developer based in Tilburg, The Netherlands. My goal is to write software, like Pixar makes movies, BMW makes cars, Bang & Olufsen makes audio and TV systems and Apple makes computers and devices: clean, elegant, user-centered and high quality.

Table of Contents

  • About Me
  • Introduction
  • Core
    • There Is Truth In Many Things
    • Get Clojure Version
    • Keyword As Function
    • Using Sets As Functions
    • Destructure Sequences
    • Destructuring Maps
  • Functions
    • Create New Function Complementing Other Function
    • Repeating A Value Or Function Invocation
    • Composing Functions With comp
    • Set Default Value For nil Function Argument With fnil
    • Getting Results From Multiple Functions With Juxt Function
    • Pure Function Sample Buying Coffee From FP Programming In Scala Written In Clojure
  • Strings
    • Formatting With Java Format String
    • Trimming Strings
    • Check Substring Is Part Of String
    • Splitting Strings
    • Joining Elements in a Collection
    • Replacing Characters In A String With escape Function
    • Replacing Matching Values In String
  • Collections
    • Merge Maps With Function To Set Value Duplicate Keys
    • Split Collection With Predicate
    • Concatenation Of Map Function Results With mapcat
    • Transforming Collection Items With Index
    • Repeat Items In A Collection As Lazy Sequence With cycle
    • Interleave Keys And Values Into A Map With zipmap
    • Using The range Function
    • Combine First And Next Functions Multiple Times
    • Get Random Item From A Sequence
    • Query Set Of Maps With index Function
    • Creating Union Of Sets
    • Find Differences In Sets
    • Getting But The Last Element(s) From A Collection
    • Remove Duplicates From A Collection With distinct
    • Remove Consecutive Duplicate Elements From Collection
    • Getting Part Of A Vector With subvec
    • Shuffle A Collection
    • Finding The Maximum Or Minimum Value
    • Taking Or Dropping Elements From A Collection Based On Predicate
    • Partition Collection Into Sequences
    • Counting Frequency Of Items In A Collection
    • Reapply Function With Iterate To Create Infinite Sequence
    • Checking Predicate For Every Or Any Element In A Collection
    • Keep Non-Nil Function Results From Collection
    • Flatten Collections
    • Getting Intersections Between Sets
  • Files
    • Writing Text File Content With spit
    • Reading Text File Content With slurp
    • Create All Parent Directories For A File
  • Java Interoperability
    • Create New Instance Of Java Class
    • Create And Initialize Object Based On Java Class With doto
    • Use .. For Invocation Java Method Chaining
    • Invoke Java Method With Varargs Parameter
    • Turn Java Object To Map With bean Function

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