- 01: Do two strings contain the same characters?
- 02: Are the letters unique?
- 03: Is a string a palindrome?
- 04: Does one string contain another?
- 05: Count the characters.
- 06: Remove duplicate letters from a string
- 07: Condense whitespace
- 08: String is rotated
- 09: Find pangrams
- 10: Vowels and consonants
- 11: Three different letters
- 12: Find longest prefix
- 13: Run-length encoding
- 14: String permutations
- 15: Reverse the words in a string
- 16: Fizz Buzz
- 17: Generate a random number in a range
- 18: Recreate the pow() function
- 19: Swap two numbers
- 20: Number is prime?
- 21: Counting binary ones
- 22: Binary reverse
- 23: Integer disguised as string
- 24: Add numbers inside a string
- 25: Calculate a square root by hand
- 26: Subtract without subtract
- 27: Print last lines
- 28: Log a message
- 29: Documents directory
- 30: New JPEGs