Racket

'''Racket''' (renamed from "PLT Scheme" years ago) is a member of the Lisp and Scheme family of languages. Racket draws freely from the various strands of its lineage.

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• Wikipedia

Todo

Reports:Tasks_not_implemented_in_Racket

Tasks

• 100 doors
• 15 Puzzle Game
• 15 puzzle solver
• 2048
• 21 Game
• 24 game
• 24 game/Solve
• 9 billion names of God the integer
• A* search algorithm
• A+B
• ABC Problem
• AKS test for primes
• ASCII art diagram converter
• Abbreviations, easy
• Abbreviations, simple
• Abstract type
• Abundant odd numbers
• Abundant, deficient and perfect number classifications
• Accumulator factory
• Ackermann function
• Active Directory/Connect
• Active object
• Addition chains
• Addition-chain exponentiation
• Address of a variable
• Align columns
• Aliquot sequence classifications
• Almost prime
• Amb
• Anagrams
• Anagrams/Deranged anagrams
• Angle difference between two bearings
• Animate a pendulum
• Animation
• Anonymous recursion
• Anti-primes
• Append a record to the end of a text file
• Apply a callback to an array
• Approximate Equality
• Arbitrary-precision integers (included)
• Archimedean spiral
• Arena storage pool
• Arithmetic evaluation
• Arithmetic-geometric mean
• Arithmetic-geometric mean/Calculate Pi
• Arithmetic/Complex
• Arithmetic/Integer
• Arithmetic/Rational
• Array concatenation
• Array length
• Arrays
• Assertions
• Assertions in design by contract
• Associative array/Creation
• Associative array/Iteration
• Atomic updates
• Attractive numbers
• Average loop length
• Averages/Arithmetic mean
• Averages/Mean angle
• Averages/Mean time of day
• Averages/Median
• Averages/Mode
• Averages/Pythagorean means
• Averages/Root mean square
• Averages/Simple moving average
• Babbage problem
• Bacon cipher
• Balanced brackets
• Balanced ternary
• Banker's algorithm
• Barnsley fern
• Base58Check encoding
• Base64 encode data
• Benford's law
• Bernoulli numbers
• Best shuffle
• Bilinear interpolation
• Binary digits
• Binary search
• Binary strings
• Birthday problem
• Bitcoin/address validation
• Bitcoin/public point to address
• Bitmap
• Bitmap/Bézier curves/Cubic
• Bitmap/Bézier curves/Quadratic
• Bitmap/Flood fill
• Bitmap/Histogram
• Bitmap/Midpoint circle algorithm
• Bitmap/PPM conversion through a pipe
• Bitmap/Read a PPM file
• Bitmap/Read an image through a pipe
• Bitmap/Write a PPM file
• Bitwise IO
• Bitwise operations
• Boolean values
• Box the compass
• Brace expansion
• Bresenham's Line Algorithm
• Brownian tree
• Bulls and cows
• Bulls and cows/Player
• CRC-32
• CSV data manipulation
• CSV to HTML translation
• CUSIP
• Caesar cipher
• Calculating the value of e
• Calendar
• Call a foreign-language function
• Call a function
• Call a function in a shared library
• Call an object method
• Card shuffles
• Carmichael 3 strong pseudoprimes
• Cartesian product of two or more lists
• Case-sensitivity of identifiers
• Casting out nines
• Catalan numbers
• Catalan numbers/Pascal's triangle
• Catamorphism
• Chaos game
• Character codes
• Chat server
• Chebyshev coefficients
• Check Machin-like formulas
• Check input device is a terminal
• Check output device is a terminal
• Check that file exists
• Checkpoint synchronization
• Chemical Calculator
• Cheryl's Birthday
• Chinese remainder theorem
• Chinese zodiac
• Cholesky decomposition
• Church Numerals
• Cipolla's algorithm
• Circles of given radius through two points
• Classes
• Closest-pair problem
• Closures/Value capture
• Code segment unload
• Collections
• Color of a screen pixel
• Color quantization
• Colour bars/Display
• Colour pinstripe/Display
• Colour pinstripe/Printer
• Combinations
• Combinations and permutations
• Combinations with repetitions
• Comma quibbling
• Command-line arguments
• Commatizing numbers
• Comments
• Compare a list of strings
• Compile-time calculation
• Compiler/lexical analyzer
• Compound data type
• Concurrent computing
• Conditional structures
• Conjugate transpose
• Constrained genericity
• Constrained random points on a circle
• Continued fraction
• Continued fraction/Arithmetic/Construct from rational number
• Convert decimal number to rational
• Convert seconds to compound duration
• Convex hull
• Copy a string
• Count in factors
• Count in octal
• Count occurrences of a substring
• Count the coins
• Cramer's rule
• Create a file
• Create a file on magnetic tape
• Create a two-dimensional array at runtime
• Create an HTML table
• Create an object at a given address
• Create an object/Native demonstration
• Cumulative standard deviation
• Currency
• Currying
• Cut a rectangle
• DNS query
• Damm algorithm
• Date format
• Date manipulation
• Day of the week
• De Bruijn sequences
• Decimal floating point number to binary
• Decision tables
• Deconvolution/1D
• Deepcopy
• Define a primitive data type
• Delegates
• Delete a file
• Deming's Funnel
• Department Numbers
• Detect division by zero
• Determinant and permanent
• Determine if a string is numeric
• Determine if only one instance is running
• Determine if two triangles overlap
• Dice game probabilities
• Digital root
• Digital root/Multiplicative digital root
• Dijkstra's algorithm
• Dinesman's multiple-dwelling problem
• Dining philosophers
• Discordian date
• Display a linear combination
• Distributed programming
• Documentation
• Dot product
• Doubly-linked list/Definition
• Doubly-linked list/Element definition
• Doubly-linked list/Element insertion
• Doubly-linked list/Traversal
• Dragon curve
• Draw a clock
• Draw a cuboid
• Draw a pixel
• Draw a rotating cube
• Draw a sphere
• Draw pixel 2
• Dutch national flag problem
• Dynamic variable names
• Echo server
• Eertree
• Egyptian division
• Egyptian fractions
• Element-wise operations
• Elementary cellular automaton
• Elementary cellular automaton/Infinite length
• Elementary cellular automaton/Random Number Generator
• Elliptic curve arithmetic
• Emirp primes
• Empty directory
• Empty program
• Empty string
• Enforced immutability
• Entropy
• Entropy/Narcissist
• Enumerations
• Environment variables
• Equilibrium index
• Ethiopian multiplication
• Euler method
• Euler's identity
• Euler's sum of powers conjecture
• Evaluate binomial coefficients
• Even or odd
• Events
• Evolutionary algorithm
• Exceptions
• Exceptions/Catch an exception thrown in a nested call
• Executable library
• Execute Brainfuck
• Execute HQ9+
• Execute SNUSP
• Execute a Markov algorithm
• Execute a system command
• Exponentiation operator
• Exponentiation order
• Extend your language
• Extensible prime generator
• Extract file extension
• Extreme floating point values
• FASTA format
• FTP
• Factorial
• Factorions
• Factors of a Mersenne number
• Factors of an integer
• Farey sequence
• Fast Fourier transform
• Faulhaber's formula
• Faulhaber's triangle
• Feigenbaum constant calculation
• Fibonacci n-step number sequences
• Fibonacci sequence
• Fibonacci word
• Fibonacci word/fractal
• Filter
• Find common directory path
• Find duplicate files
• Find first and last set bit of a long integer
• Find largest left truncatable prime in a given base
• Find limit of recursion
• Find palindromic numbers in both binary and ternary bases
• Find the intersection of a line with a plane
• Find the last Sunday of each month
• Find the missing permutation
• Finite state machine
• First class environments
• First-class functions
• First-class functions/Use numbers analogously
• Five weekends
• Fivenum
• FizzBuzz
• Flatten a list
• Flipping bits game
• Flow-control structures
• Floyd's triangle
• Floyd-Warshall algorithm
• Forest fire
• Fork
• Formal power series
• Formatted numeric output
• Forward difference
• Four bit adder
• Four is magic
• Fractal tree
• Fractran
• Free polyominoes enumeration
• Function composition
• Function definition
• Function frequency
• Function prototype
• Functional coverage tree
• Fusc sequence
• GUI component interaction
• GUI enabling/disabling of controls
• GUI/Maximum window dimensions
• Galton box animation
• Gamma function
• Gauss-Jordan matrix inversion
• Gaussian elimination
• General FizzBuzz
• Generate Chess960 starting position
• Generate lower case ASCII alphabet
• Generator/Exponential
• Generic swap
• Get system command output
• Globally replace text in several files
• Go Fish
• Gradient descent
• Gray code
• Grayscale image
• Greatest common divisor
• Greatest element of a list
• Greatest subsequential sum
• Greyscale bars/Display
• Guess the number
• Guess the number/With feedback
• Guess the number/With feedback (player)
• HTTP
• HTTPS
• HTTPS/Authenticated
• HTTPS/Client-authenticated
• Hamming numbers
• Handle a signal
• Happy numbers
• Harshad or Niven series
• Hash from two arrays
• Hash join
• Haversine formula
• Hello world!
• Hello world/Graphical
• Hello world/Line printer
• Hello world/Newbie
• Hello world/Newline omission
• Hello world/Standard error
• Hello world/Text
• Hello world/Web server
• Here document
• Heronian triangles
• Hickerson series of almost integers
• Higher-order functions
• Hilbert curve
• History variables
• Hofstadter Figure-Figure sequences
• Hofstadter Q sequence
• Hofstadter-Conway $10,000 sequence
• Holidays related to Easter
• Honeycombs
• Horizontal sundial calculations
• Horner's rule for polynomial evaluation
• Host introspection
• Hostname
• Hough transform
• Huffman coding
• Humble numbers
• Hunt The Wumpus
• I before E except after C
• I.Q. Puzzle
• IBAN
• IPC via named pipe
• Identity matrix
• Idiomatically determine all the characters that can be used for symbols
• Idiomatically determine all the lowercase and uppercase letters
• Image convolution
• Image noise
• Implicit type conversion
• Include a file
• Increment a numerical string
• Index finite lists of positive integers
• Infinity
• Inheritance/Multiple
• Inheritance/Single
• Input loop
• Input/Output for Lines of Text
• Input/Output for Pairs of Numbers
• Integer comparison
• Integer overflow
• Integer roots
• Integer sequence
• Interactive Help
• Interactive programming
• Introspection
• Inverted index
• Inverted syntax
• Iterated digits squaring
• JSON
• Jaro distance
• Jensen's Device
• Jewels and Stones
• JortSort
• Josephus problem
• Julia set
• Jump anywhere
• Just in time processing on a character stream
• K-d tree
• K-means++ clustering
• Kahan summation
• Kaprekar numbers
• Kernighans large earthquake problem
• Keyboard input/Flush the keyboard buffer
• Keyboard input/Keypress check
• Keyboard input/Obtain a Y or N response
• Keyboard macros
• Knapsack problem/0-1
• Knapsack problem/Continuous
• Knapsack problem/Unbounded
• Knight's tour
• Knuth shuffle
• Knuth's algorithm S
• Koch curve
• Kosaraju
• Kronecker product
• LU decomposition
• LZW compression
• Langton's ant
• Largest int from concatenated ints
• Last Friday of each month
• Last letter-first letter
• Launch rocket with countdown and acceleration in stdout
• Leap year
• Least common multiple
• Left factorials
• Leonardo numbers
• Letter frequency
• Levenshtein distance
• Levenshtein distance/Alignment
• Linear congruential generator
• Linux CPU utilization
• List comprehensions
• List rooted trees
• Literals/Floating point
• Literals/Integer
• Literals/String
• Logical operations
• Long multiplication
• Long primes
• Longest Common Substring
• Longest common prefix
• Longest common subsequence
• Longest increasing subsequence
• Longest string challenge
• Look-and-say sequence
• Loop over multiple arrays simultaneously
• Loops/Break
• Loops/Continue
• Loops/Do-while
• Loops/Downward for
• Loops/For
• Loops/For with a specified step
• Loops/Foreach
• Loops/Increment loop index within loop body
• Loops/Infinite
• Loops/N plus one half
• Loops/Nested
• Loops/While
• Loops/Wrong ranges
• Lucas-Lehmer test
• Ludic numbers
• Luhn test of credit card numbers
• MAC Vendor Lookup
• MD4
• MD5
• MD5/Implementation
• Machine code
• Mad Libs
• Magic 8-Ball
• Magic squares of odd order
• Main step of GOST 28147-89
• Make a backup file
• Make directory path
• Man or boy test
• Mandelbrot set
• Map range
• Markov chain text generator
• Matrix Digital Rain
• Matrix multiplication
• Matrix transposition
• Matrix-exponentiation operator
• Maximum triangle path sum
• Maze generation
• Maze solving
• McNuggets Problem
• Median filter
• Memory allocation
• Memory layout of a data structure
• Menu
• Metaprogramming
• Metered concurrency
• Middle three digits
• Miller–Rabin primality test
• Minesweeper game
• Modular arithmetic
• Modular exponentiation
• Modular inverse
• Modulinos
• Monads/List monad
• Monads/Maybe monad
• Monte Carlo methods
• Montgomery reduction
• Monty Hall problem
• Morpion solitaire
• Morse code
• Most frequent k chars distance
• Move-to-front algorithm
• Multi-dimensional array
• Multifactorial
• Multiline shebang
• Multiple distinct objects
• Multiple regression
• Multiplication tables
• Multiplicative order
• Multisplit
• Munchausen numbers
• Munching squares
• Musical scale
• Mutual recursion
• N'th
• N-queens problem
• NYSIIS
• Named parameters
• Names to numbers
• Naming conventions
• Narcissist
• Narcissistic decimal number
• Native shebang
• Natural sorting
• Nautical bell
• Negative base numbers
• Nested function
• Nested templated data
• Nim Game
• Non-continuous subsequences
• Non-decimal radices/Convert
• Non-decimal radices/Input
• Non-decimal radices/Output
• Nonoblock
• Nonogram solver
• Nth root
• Null object
• Number names
• Number reversal game
• Numeric error propagation
• Numerical integration
• Numerical integration/Gauss-Legendre Quadrature
• Object serialization
• Odd word problem
• Old Russian measure of length
• Old lady swallowed a fly
• One of n lines in a file
• One-dimensional cellular automata
• One-time pad
• OpenGL
• OpenGL Pixel Shader
• OpenWebNet Password
• Operator precedence
• Optional parameters
• Order disjoint list items
• Order two numerical lists
• Ordered Partitions
• Ordered words
• Palindrome detection
• Pangram checker
• Paraffins
• Parallel Brute Force
• Parallel calculations
• Parametric polymorphism
• Parametrized SQL statement
• Parse an IP Address
• Parse command-line arguments
• Parsing/RPN calculator algorithm
• Parsing/RPN to infix conversion
• Parsing/Shunting-yard algorithm
• Partial function application
• Particle Swarm Optimization
• Partition an integer X into N primes
• Pascal matrix generation
• Pascal's triangle
• Pascal's triangle/Puzzle
• Password generator
• Pathological floating point problems
• Pattern matching
• Peano curve
• Penney's game
• Penrose tiling
• Pentagram
• Percentage difference between images
• Perceptron
• Percolation/Bond percolation
• Percolation/Mean cluster density
• Percolation/Mean run density
• Percolation/Site percolation
• Perfect numbers
• Perfect shuffle
• Perfect totient numbers
• Perlin noise
• Permutation test
• Permutations
• Permutations by swapping
• Permutations with repetitions
• Permutations/Derangements
• Permutations/Rank of a permutation
• Pernicious numbers
• Phrase reversals
• Pi
• Pick random element
• Pig the dice game
• Pig the dice game/Player
• Pinstripe/Display
• Pinstripe/Printer
• Plasma effect
• Play recorded sounds
• Playing cards
• Plot coordinate pairs
• Pointers and references
• Poker hand analyser
• Polymorphic copy
• Polymorphism
• Polynomial long division
• Polynomial regression
• Polyspiral
• Population count
• Power set
• Pragmatic directives
• Price fraction
• Primality by trial division
• Prime conspiracy
• Prime decomposition
• Primes - allocate descendants to their ancestors
• Primorial numbers
• Print debugging statement
• Priority queue
• Probabilistic choice
• Problem of Apollonius
• Program name
• Program termination
• Proof
• Proper divisors
• Pythagoras tree
• Pythagorean quadruples
• Pythagorean triples
• QR decomposition
• Quaternion type
• Queue/Definition
• Queue/Usage
• Quickselect algorithm
• Quine
• RCRPG
• RIPEMD-160
• RPG Attributes Generator
• RSA code
• Railway circuit
• Ramer-Douglas-Peucker line simplification
• Ramsey's theorem
• Random number generator (device)
• Random number generator (included)
• Random numbers
• Range consolidation
• Range expansion
• Range extraction
• Ranking methods
• Rate counter
• Ray-casting algorithm
• Read a configuration file
• Read a file character by character/UTF8
• Read a file line by line
• Read a specific line from a file
• Read entire file
• Readline interface
• Real constants and functions
• Record sound
• Reduced row echelon form
• Regular expressions
• Remove duplicate elements
• Remove lines from a file
• Rename a file
• Rendezvous
• Rep-string
• Repeat
• Repeat a string
• Resistor mesh
• Respond to an unknown method call
• Retrieve and search chat history
• Return multiple values
• Reverse a string
• Reverse the gender of a string
• Reverse words in a string
• Rock-paper-scissors
• Roman numerals/Decode
• Roman numerals/Encode
• Roots of a function
• Roots of a quadratic function
• Roots of unity
• Rosetta Code/Count examples
• Rosetta Code/Find bare lang tags
• Rosetta Code/Find unimplemented tasks
• Rosetta Code/Fix code tags
• Rosetta Code/Rank languages by number of users
• Rot-13
• Run as a daemon or service
• Run-length encoding
• Runge-Kutta method
• Runtime evaluation
• Runtime evaluation/In an environment
• S-Expressions
• SEDOLs
• SHA-1
• SHA-256
• SQL-based authentication
• Sailors, coconuts and a monkey problem
• Same Fringe
• Sattolo cycle
• Scope modifiers
• Scope/Function names and labels
• Search a list
• Search a list of records
• Secure temporary file
• Selective File Copy
• Self-describing numbers
• Self-referential sequence
• Semiprime
• Semordnilap
• Send an unknown method call
• Send email
• Separate the house number from the street name
• Sequence of primes by trial division
• Sequence of primorial primes
• Set
• Set consolidation
• Set of real numbers
• Set puzzle
• Seven-sided dice from five-sided dice
• Shell one-liner
• Shoelace formula for polygonal area
• Short-circuit evaluation
• Shortest common supersequence
• Show Ascii table
• Show the epoch
• Sierpinski carpet
• Sierpinski pentagon
• Sierpinski triangle
• Sierpinski triangle/Graphical
• Sieve of Eratosthenes
• Simple database
• Simple windowed application
• Simulate input/Keyboard
• Simulate input/Mouse
• Sine wave
• Singleton
• Singly-linked list/Element definition
• Singly-linked list/Element insertion
• Singly-linked list/Element removal
• Singly-linked list/Traversal
• Sleep
• Snake And Ladder
• Sockets
• Sokoban
• Solve a Hidato puzzle
• Solve a Holy Knight's tour
• Solve a Hopido puzzle
• Solve a Numbrix puzzle
• Solve the no connection puzzle
• Sort a list of object identifiers
• Sort an array of composite structures
• Sort an integer array
• Sort disjoint sublist
• Sort numbers lexicographically
• Sort stability
• Sort three variables
• Sort using a custom comparator
• Sorting Algorithms/Circle Sort
• Sorting algorithms/Bead sort
• Sorting algorithms/Bogosort
• Sorting algorithms/Bubble sort
• Sorting algorithms/Cocktail sort
• Sorting algorithms/Comb sort
• Sorting algorithms/Counting sort
• Sorting algorithms/Cycle sort
• Sorting algorithms/Gnome sort
• Sorting algorithms/Heapsort
• Sorting algorithms/Insertion sort
• Sorting algorithms/Merge sort
• Sorting algorithms/Pancake sort
• Sorting algorithms/Patience sort
• Sorting algorithms/Permutation sort
• Sorting algorithms/Quicksort
• Sorting algorithms/Radix sort
• Sorting algorithms/Selection sort
• Sorting algorithms/Shell sort
• Sorting algorithms/Sleep sort
• Sorting algorithms/Stooge sort
• Sorting algorithms/Strand sort
• Sorting algorithms/Tree sort on a linked list
• Soundex
• Sparkline in unicode
• Special characters
• Special variables
• Speech synthesis
• Spinning rod animation/Text
• Spiral matrix
• Split a character string based on change of character
• Square but not cube
• Square-free integers
• Stable marriage problem
• Stack
• Stack traces
• Stair-climbing puzzle
• Start from a main routine
• Starting a web browser
• State name puzzle
• Statistics/Basic
• Statistics/Normal distribution
• Stem-and-leaf plot
• Stern-Brocot sequence
• Straddling checkerboard
• Stream Merge
• 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 block comments
• Strip comments from a string
• Strip control codes and extended characters from a string
• Strip whitespace from a string/Top and tail
• Subleq
• Subset sum problem
• Substitution Cipher
• Substring
• Substring/Top and tail
• Subtractive generator
• Sudoku
• Suffix tree
• Sum and Product Puzzle
• Sum and product of an array
• Sum digits of an integer
• Sum multiples of 3 and 5
• Sum of a series
• Sum of squares
• Sum to 100
• Sunflower fractal
• Superellipse
• Superpermutation minimisation
• Sutherland-Hodgman polygon clipping
• Symmetric difference
• Synchronous concurrency
• System time
• Table creation
• Table creation/Postal addresses
• Take notes on the command line
• Tarjan
• Taxicab numbers
• Temperature conversion
• Terminal control/Clear the screen
• Terminal control/Coloured text
• Terminal control/Cursor movement
• Terminal control/Cursor positioning
• Terminal control/Dimensions
• Terminal control/Display an extended character
• Terminal control/Hiding the cursor
• Terminal control/Inverse video
• Terminal control/Positional read
• Terminal control/Preserve screen
• Terminal control/Ringing the terminal bell
• Terminal control/Unicode output
• Ternary logic
• Test a function
• Test integerness
• Text between
• Text processing/1
• Text processing/2
• Text processing/Max licenses in use
• Textonyms
• The ISAAC Cipher
• The Twelve Days of Christmas
• Thiele's interpolation formula
• Thue-Morse
• Tic-tac-toe
• Time a function
• Time-based One-time Password Algorithm
• Tokenize a string
• Tokenize a string with escaping
• Tonelli-Shanks algorithm
• Top rank per group
• Topic variable
• Topological sort
• Topological sort/Extracted top item
• Topswops
• Total circles area
• Totient function
• Trabb Pardo–Knuth algorithm
• Transportation problem
• Tree traversal
• Trigonometric functions
• Truncatable primes
• Truncate a file
• Truth table
• Twelve statements
• Two Sum
• Type detection
• URL decoding
• URL encoding
• URL parser
• UTF-8 encode and decode
• Ulam spiral (for primes)
• Unbias a random generator
• Undefined values
• Unicode strings
• Unicode variable names
• Unit testing
• Universal Turing machine
• Unix/ls
• Untrusted environment
• Update a configuration file
• Use another language to call a function
• VList
• Validate International Securities Identification Number
• Vampire number
• Van Eck sequence
• Van der Corput sequence
• Variable size/Get
• Variable size/Set
• Variable-length quantity
• Variables
• Variadic function
• Vector
• Vector products
• Verify distribution uniformity/Chi-squared test
• Verify distribution uniformity/Naive
• Vibrating rectangles
• Vigenère cipher
• Vigenère cipher/Cryptanalysis
• Visualize a tree
• Vogel's approximation method
• Walk a directory/Non-recursively
• Walk a directory/Recursively
• Water collected between towers
• Web scraping
• Welch's t-test
• Window creation
• Window creation/X11
• Window management
• Wireworld
• Word break problem
• Word frequency
• Word search
• Word wrap
• World Cup group stage
• Write entire file
• Write float arrays to a text file
• Write to Windows event log
• XML/DOM serialization
• XML/Input
• XML/Output
• XML/XPath
• Xiaolin Wu's line algorithm
• Y combinator
• Yahoo! search interface
• Yin and yang
• Zebra puzzle
• Zeckendorf arithmetic
• Zeckendorf number representation
• Zero to the zero power
• Zhang-Suen thinning algorithm
• Zig-zag matrix
• Zumkeller numbers