Rebol

Rebol is a programming language.

Tasks

• 100 doors
• 15 Puzzle Game
• A+B
• Abstract type
• Accumulator factory
• Ackermann function
• Add a variable to a class instance at runtime
• Align columns
• Animation
• Anonymous recursion
• Apply a callback to an array
• Arithmetic/Integer
• Array concatenation
• Arrays
• Averages/Arithmetic mean
• Averages/Median
• Boolean values
• Calendar
• Check that file exists
• Classes
• Comma quibbling
• Comments
• Copy a string
• Create a file
• Date format
• Date manipulation
• Day of the week
• Delete a file
• Detect division by zero
• Determine if a string is numeric
• Documentation
• Dot product
• Dynamic variable names
• Echo server
• Empty program
• Environment variables
• Execute a system command
• FTP
• Factorial
• Filter
• Find the last Sunday of each month
• First-class functions
• FizzBuzz
• Flatten a list
• Flow-control structures
• Formatted numeric output
• Function composition
• Function definition
• Generic swap
• Greatest common divisor
• Greatest element of a list
• HTTP
• Hello world!
• Hello world/Graphical
• Hello world/Newline omission
• Hello world/Text
• Higher-order functions
• Horner's rule for polynomial evaluation
• Hostname
• Increment a numerical string
• Inheritance/Single
• Input loop
• Integer comparison
• Interactive programming
• JSON
• Josephus problem
• Keyboard macros
• Knuth shuffle
• Last Friday of each month
• Leap year
• Literals/Integer
• Logical operations
• Loops/Break
• Loops/Continue
• Loops/Do-while
• Loops/Downward for
• Loops/For
• Loops/For with a specified step
• Loops/Foreach
• Loops/Infinite
• Loops/N plus one half
• Loops/Nested
• Loops/While
• MD5
• Mad Libs
• Menu
• Multiplication tables
• Mutual recursion
• Null object
• Number reversal game
• Palindrome detection
• Percentage difference between images
• Perfect numbers
• Primality by trial division
• Program termination
• Queue/Definition
• Queue/Usage
• Quine
• Read a specific line from a file
• Read entire file
• Regular expressions
• Remove duplicate elements
• Rename a file
• Repeat a string
• Reverse a string
• Rot-13
• Runtime evaluation
• Runtime evaluation/In an environment
• Search a list
• Send email
• Shell one-liner
• Simple database
• Simple windowed application
• Sleep
• Sort an integer array
• Sort stability
• Sorting algorithms/Insertion sort
• Sorting algorithms/Merge sort
• Stack
• Stair-climbing puzzle
• String case
• String concatenation
• String interpolation (included)
• String length
• Substring
• Sum and product of an array
• Symmetric difference
• System time
• Take notes on the command line
• Tokenize a string
• Trigonometric functions
• Variadic function
• Web scraping
• Window creation
• XML/Input
• Y combinator