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+# Real World Haskell solutions
+
+These are solutions to exercises from me reading the first edition of the [the
+Real World Haskell book](https://book.realworldhaskell.org/). I hope they will
+be helpful in your journey to the world of Haskell.
+
+The goal is to provide solutions to all the exercises. I'm adding them gradually
+as I'm progressing through the book.
+
+There is often more than one solution to an exercise. If your solution is
+different but meets the assignment, it is the right one.
+
+The intention is for the exercises to be solved as by a beginner, with all the
+things that a seasoned Haskell programmer would have done differently. Where
+possible, the solutions should use only knowledge from the preceding parts of
+the book.
+
+## Exercises
+
+There are a few kinds of exercises:
+
+- Describe what happens when you run the code
+- Answer a question
+- Write an implementation
+
+Solutions to the first two kinds of exercises are provided in comments.
+
+Some exercises are not unambiguous. In these cases I describe my additional
+assumptions and thought process in comments.
+
+Some solution implementations depend on [the example code from the
+book](https://resources.oreilly.com/examples/9780596514983). The complete
+examples repository these solutions are base on is added as a submodule in the
+'examples' directory. If a solution of an exercise depends on source files from
+the examples, those files are copied to a directory of that solution.
+
+Here is a list of the exercises. Format of an exercise label is
+'\<chapter\>\_\<group\>\_\<exercise\>'. Some chapters contain more groups of
+exercises. To differentiate those, an exercises group letter is included (the
+exact letters don't have a connection to the book). To make the exercise groups
+more visible in the list the first exercise of a group is in bold italics.
+
+
+| Exercise       | Solved | Page | Chapter |
+| -------------- | ------ | ---- | ------- |
+| **_1_a_1_**    |        | 16   | 1. Getting started |
+| 1_a_2          |        |      | |
+| 1_a_3          |        |      | |
+| 1_a_4          |        |      | |
+| **_2_a_1_**    |        | 25   | 2. Types and functions |
+| **_2_b_1_**    |        | 39   | |
+| 2_b_2          |        |      | |
+| 2_b_3          |        |      | |
+| **_3_a_1_**    |        | 60   | 3. Defining types, streamlining functions |
+| 3_a_2          |        |      | |
+| **_3_b_1_**    |        | 69   | |
+| 3_b_2          |        |      | |
+| 3_b_3          |        |      | |
+| 3_b_4          |        |      | |
+| 3_b_5          |        |      | |
+| 3_b_6          |        | 70   | |
+| 3_b_7          |        |      | |
+| 3_b_8          |        |      | |
+| 3_b_9          |        |      | |
+| 3_b_10         |        |      | |
+| 3_b_11         |        |      | |
+| 3_b_12         |        |      | |
+| **_4_a_1_**    |        | 84   | 4. Functional programming |
+| 4_a_2          |        |      | |
+| 4_a_3          |        |      | |
+| 4_a_4          |        |      | |
+| **_4_b_1_**    |        | 97   | |
+| 4_b_2          |        | 98   | |
+| 4_b_3          |        |      | |
+| 4_b_4          |        |      | |
+| 4_b_5          |        |      | |
+| 4_b_6          |        |      | |
+| 4_b_7          |        |      | |
+| 4_b_8          |        |      | |
+| 4_b_9          |        |      | |
+| 4_b_10         |        |      | |
+| **_5_a_1_**    |        | 130  | 5. Writing a library: working with JSON data |
+| 5_a_2          |        |      | |
+| **_6_a_1_**    |        | 162  | 6. Using typeclasses |
+| 6_a_2          |        |      | |
+| **_8_a_1_**    |        | 205  | 8. Efficient file processing, regular expressions, and file name matching |
+| 8_a_2          |        |      | |
+| **_8_b_1_**    |        | 210  | |
+| 8_b_2          |        |      | |
+| 8_b_3          |        |      | |
+| **_8_b_1_**    |        | 211  | |
+| 8_b_2          |        |      | |
+| **_8_d_1_**    |        | 212  | |
+| **_9_a_1_**    |        | 221  | 9. I/O case study: a library for searching the filesystem |
+| **_9_b_1_**    |        | 228  | |
+| 9_b_2          |        |      | |
+| 9_b_3          |        |      | |
+| 9_b_4          |        |      | |
+| **_9_c_1_**    |        | 232  | |
+| 9_c_2          |        |      | |
+| 9_c_3          |        |      | |
+| **_9_d_1_**    |        | 234  | |
+| 9_d_2          |        |      | |
+| **_10_a_1_**   |        | 254  | 10. Code case study: parsing a binary data format |
+| 10_a_2         |        |      | |
+| 10_a_3         |        |      | |
+| **_12_a_1_**   |        | 274  | 12. Barcode recognition |
+| 12_a_2         |        |      | |
+| 12_a_3         |        |      | |
+| **_13_a_1_**   |        | 316  | 13. Data structures |
+| **_14_a_1_**   |        | 352  | 14. Monads |
+| **_15_a_1_**   |        | 382  | 15. Programming with monads |
+| 15_a_2         |        |      | |
+| 15_a_3         |        |      | |
+| **_16_a_1_**   |        | 403  | 16. The Parsec parsing library |
+| 16_a_2         |        |      | |
+| 16_a_3         |        |      | |
+| 16_a_4         |        |      | |
+| **_18_a_1_**   |        | 436  | 18. Monad transformers |
+| 18_a_2         |        |      | |
+| 18_a_3         |        |      | |
+| **_18_b_1_**   |        | 441  | |
+| **_19_a_1_**   |        | 462  | 19. Error handling |
+| **_19_b_1_**   |        | 465  | |
+| 19_b_2         |        |      | |
+| 19_b_3         |        |      | |
+| **_23_a_1_**   |        | 529  | 23. GUI programming |
+| 23_a_2         |        |      | |
+| 23_a_3         |        |      | |
+| **_24_a_1_**   |        | 542  | 24. Basic concurrent and parallel programming |
+| 24_a_2         |        |      | |
+| **_24_b_1_**   |        | 551  | |
+| 24_b_2         |        |      | |
+| **_26_a_1_**   |        | 610  | 26. Advanced library design: building a Bloom filter |
+| 26_a_2         |        |      | |
+
+## Bug reports
+
+If you find an error in a solution or anything that should be described more
+clearly, feel free to let me know.