Chapter 1. Strings 1.1. Using strings 1. Hello, World! 2. Greet a person 3. String length 4. Unique digits 1.2. Modifying string data 5. Reverse a string 6. Removing blanks from a string 7. Camel case 8. Incrementing filenames 9. Random passwords 10. DNA-to-RNA transcription 11. Caesar cipher 1.3. Text analysis 12. Plural endings 13. The most frequent word 14. The longest common substring 15. Anagram test 16. Palindrome test 17. The longest palindrome 18. Finding duplicate texts Chapter 2. Numbers 2.1. Using numbers 19. π 20. Factorial! 21. Fibonacci numbers 22. Print squares 23. Powers of two 24. Odd and even numbers 25. Compare numbers approximately 26. Multiplying big numbers 27. Prime numbers 28. List of prime numbers 29. Prime factors 30. Reducing a fraction 31. Divide by zero 2.2. Random numbers 32. Generating random numbers 33. Neumann’s random generator 34. Histogram of random numbers 2.3. Mathematical problems 35. Distance between two points 36. Standard deviation 37. Polar coordinates 38. Monte Carlo method 2.4. Numbers and strings 39. Unicode digits 40. Guess the number 41. Binary to integer 42. Integer as binary, octal, and hex 43. Sum of digits 44. Bit counter 45. Compose the largest number 46. Convert to Roman numerals 47. Spelling numbers Chapter 3. Aggregate Data Types 3.1. Manipulating lists and arrays 48. Swap two values 49. Reverse a list 50. Rotate a list 51. Randomise an array 52. Incrementing array elements 53. Adding up two arrays 54. Exclusion of two arrays 3.2. Information retrieval 55. Sum of the elements of an array 56. Average of an array 57. Moving average 58. Is an element in a list? 59. First odd number 60. Take every second element 61. Number of occurrences in array 62. Finding unique elements 63. Minimum and maximum 64. Increasing sequences 3.3. Working with subroutines 65. Passing arrays to subroutines 66. Variadic parameters in a sub 3.4. Multi-dimensional data 67. Transpose a matrix 68. Sort hashes by parameter 69. Count hash values 70. Product table 71. Pascal triangle Chapter 4. Regexes and Grammars 4.1. Regex matching 72. Count vowels in a word 73. Count words 74. Skipping Pod documentation 75. Currency converter 4.2. Substitutions with regexes 76. Double each character 77. Remove duplicated words 78. Separate digits and letters 79. Separate groups of digits 80. Increase digits by one 81. Pig Latin 82. Simple string compressor 83. %Templating% engine 4.3. Using grammars 84. Decode Roman numerals 85. Balanced parentheses 86. Basic calculator Chapter 5. Date and Time 87. Current date and time 88. Formatted date 89. Datetime arithmetic 90. Leap years Chapter 6. Parallel Computing 91. Setting timeouts 92. Sleep Sort 93. Atomic operations 94. Parallel file processing Chapter 7. Miscellaneous 95. The cat utility 96. The uniq utility 97. Reading directory content 98. Text to Morse code 99. Morse to text 100. Brainfuck interpreter