Elena

ELENA is a general-purpose, object-oriented, polymorphic language with late binding. It features message dispatching/manipulation, dynamic object mutation, a script engine / interpreter and mix-ins.

• ELENA on Github
• ELENA on Reddit

Tasks

• 100 doors
• 24 game
• A+B
• ABC Problem
• AKS test for primes
• Abundant, deficient and perfect number classifications
• Accumulator factory
• Ackermann function
• Add a variable to a class instance at runtime
• Amb
• Amicable pairs
• Anagrams
• Anonymous recursion
• Apply a callback to an array
• Arithmetic evaluation
• Arithmetic/Integer
• Array concatenation
• Array length
• Arrays
• Associative array/Creation
• Associative array/Iteration
• Averages/Arithmetic mean
• Averages/Median
• Averages/Mode
• Averages/Root mean square
• Averages/Simple moving average
• Babbage problem
• Balanced brackets
• Best shuffle
• Binary digits
• Bitwise operations
• Boolean values
• Bulls and cows
• Caesar cipher
• Call a function
• Call an object method
• Case-sensitivity of identifiers
• Catamorphism
• Character codes
• Check that file exists
• Classes
• Closures/Value capture
• Collections
• Combinations
• Command-line arguments
• Comments
• Compare a list of strings
• Compound data type
• Copy a string
• Create a file
• Create a two-dimensional array at runtime
• Define a primitive data type
• Delegates
• Delete a file
• Digital root
• Dot product
• Dynamic variable names
• Empty program
• Empty string
• Entropy
• Equilibrium index
• Evolutionary algorithm
• Exceptions
• Exceptions/Catch an exception thrown in a nested call
• Execute Brainfuck
• Fibonacci sequence
• Filter
• First-class functions
• First-class functions/Use numbers analogously
• Function composition
• Function definition
• GUI component interaction
• Generate lower case ASCII alphabet
• Generic swap
• Greatest common divisor
• Greatest element of a list
• Guess the number
• Guess the number/With feedback
• Hailstone sequence
• Happy numbers
• Haversine formula
• Hello world!
• Hello world/Graphical
• Hello world/Newline omission
• Hello world/Text
• Higher-order functions
• History variables
• Horner's rule for polynomial evaluation
• Identity matrix
• Increment a numerical string
• Inheritance/Multiple
• Inheritance/Single
• Input loop
• Integer comparison
• Integer sequence
• JSON
• Keyboard input/Keypress check
• Knuth shuffle
• Knuth's algorithm S
• Least common multiple
• Literals/Floating point
• Literals/Integer
• Literals/String
• Logical operations
• Loop over multiple arrays simultaneously
• Loops/For
• Loops/For with a specified step
• Loops/Foreach
• Loops/Infinite
• Loops/While
• Magic squares of doubly even order
• Man or boy test
• Maximum triangle path sum
• Middle three digits
• Mutual recursion
• N'th
• Nested function
• Number reversal game
• Old lady swallowed a fly
• Partial function application
• Perfect numbers
• Phrase reversals
• Pick random element
• Polymorphic copy
• Polymorphism
• Program name
• Quaternion type
• Queue/Definition
• Queue/Usage
• Random number generator (included)
• Random numbers
• Read a file line by line
• Real constants and functions
• Reflection/List methods
• Reflection/List properties
• Remove duplicate elements
• Repeat a string
• Respond to an unknown method call
• Return multiple values
• Reverse a string
• Reverse words in a string
• Roman numerals/Decode
• Roman numerals/Encode
• Rot-13
• Run-length encoding
• Runtime evaluation
• Runtime evaluation/In an environment
• Search a list
• Search a list of records
• Send an unknown method call
• Sequence of primes by trial division
• Set of real numbers
• Short-circuit evaluation
• Simple windowed application
• Singleton
• Singly-linked list/Element definition
• Singly-linked list/Element insertion
• Singly-linked list/Traversal
• Sleep
• Sockets
• Sort an array of composite structures
• Sort an integer array
• Sort disjoint sublist
• Sort three variables
• Sort using a custom comparator
• Sorting algorithms/Bogosort
• Sorting algorithms/Bubble sort
• Sorting algorithms/Cocktail sort
• Sorting algorithms/Comb sort
• Sorting algorithms/Counting sort
• Sorting algorithms/Gnome sort
• Sorting algorithms/Insertion sort
• Sorting algorithms/Pancake sort
• Sorting algorithms/Quicksort
• Sorting algorithms/Selection sort
• Sorting algorithms/Sleep sort
• Sorting algorithms/Stooge sort
• Stack
• Stack traces
• String append
• String case
• String comparison
• String concatenation
• String interpolation (included)
• String length
• String matching
• String prepend
• Strip a set of characters from a string
• Strip whitespace from a string/Top and tail
• Substring
• Substring/Top and tail
• Sum and product of an array
• Sum of a series
• Sum of squares
• System time
• Temperature conversion
• Terminal control/Clear the screen
• Terminal control/Cursor positioning
• Ternary logic
• The Twelve Days of Christmas
• Thue-Morse
• Time a function
• Tokenize a string
• Tokenize a string with escaping
• Top rank per group
• Trabb Pardo–Knuth algorithm
• Tree traversal
• Trigonometric functions
• Truncatable primes
• Truncate a file
• Twelve statements
• UTF-8 encode and decode
• Unbias a random generator
• Unicode strings
• Unicode variable names
• Variables
• Variadic function
• Vigenère cipher
• Visualize a tree
• Walk a directory/Non-recursively
• Wireworld
• Word wrap
• World Cup group stage
• Write entire file
• Y combinator
• Zeckendorf arithmetic
• Zeckendorf number representation
• Zero to the zero power
• Zhang-Suen thinning algorithm
• Zig-zag matrix