Tasks not implemented in J
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If J is a language you like, or are interested in, please inform your fellow members of the J community; this page can't be emptied without your and their participation.
If J is a language you like, or are interested in, please inform your fellow members of the J community; this page can't be emptied without your and their participation.
Tasks not implemented in J
1
A
- ABC correlation
- Active Directory/Connect
- Active Directory/Search for a user
- Animated Spinners
- Atomic updates
B
- Bernstein basis polynomials
- Bioinformatics/Global alignment
- Bitcoin/address validation
- Bitcoin/public point to address
- Bitmap/PPM conversion through a pipe
- Bitmap/Read an image through a pipe
- Bron–Kerbosch algorithm
- Bézier curves/Intersections
C
- Camel case and snake case
- Centre and radius of a circle passing through 3 points in a plane
- Chat server
- Check if a polygon overlaps with a rectangle
- Check if two polygons overlap
- Check input device is a terminal
- Colour pinstripe/Printer
- Continued fraction/Arithmetic/G(matrix ng, continued fraction n1, continued fraction n2)
- Copy stdin to stdout
- Create a file on magnetic tape
- Cycles of a permutation
D
- Dating agency
- Determine if only one instance is running
- Determine if two triangles overlap
- Determine sentence type
- Distributed programming
- Distribution of 0 digits in factorial series
- Dominoes
E
F
- Factorize string into Lyndon words
- Find duplicate files
- Four is the number of letters in the ...
- French Republican calendar
G
H
- HTTPS/Authenticated
- HTTPS/Client-authenticated
- Handle a signal
- Harriss Spiral
- Hashtron inference
- Horse racing
- Hunt the Wumpus
J
K
L
M
N
O
P
- P-Adic numbers, basic
- P-Adic square roots
- P-value correction
- Pancake numbers
- Parallel brute force
- Parameterized SQL statement
- Particle fountain
- Peaceful chess queen armies
- Pentomino tiling
- Percolation/Bond percolation
- Peripheral drift illusion
- Pinstripe/Printer
- Pisano period
- Play recorded sounds
- Pseudo-random numbers/Combined recursive generator MRG32k3a
- Pseudo-random numbers/Splitmix64
- Pseudo-random numbers/Xorshift star
R
- RCRPG
- RIPEMD-160
- Random sentence from book
- Record sound
- Rendezvous
- Retrieve and search chat history
- Rosetta Code/Find bare lang tags
- Rosetta Code/Rank languages by number of users
S
- SHA-256 Merkle tree
- SOAP
- SQL-based authentication
- Secure temporary file
- Self numbers
- Send email
- Shortest common supersequence
- Sierpinski arrowhead curve
- Sierpinski pentagon
- Simulate input/Keyboard
- Simulate input/Mouse
- Smallest number k such that k+2^m is composite for all m less than k
- Sokoban
- Solve a Hidato puzzle
- Solve a Hopido puzzle
- Solve a Numbrix puzzle
- Sorting algorithms/Cocktail sort with shifting bounds
- Speech synthesis
- Steffensen's method
- Strassen's algorithm
- Stream merge
- Suffixation of decimal numbers
- Sync subtitles
- Syntax highlighting using Mediawiki formatting
T
- Terminal control/Cursor movement
- Terminal control/Positional read
- Terminal control/Preserve screen
- Terminal control/Unicode output
- Tree datastructures
- Tropical algebra overloading
- Twin primes whose sum is square number
- Two bullet roulette
U
V
W
X
Y
Draft tasks not implemented in J
1
A
- ABC incremental counts
- ASCII control characters
- Addition chains
- Addition-chain exponentiation
- Air mass
- Audio alarm
- Audio frequency generator
- Audio overlap loop
B
- B-spline
- Base58Check encoding
- Bioinformatics/Subsequence
- Blackjack strategy
- Boids
- Brace expansion using ranges
- Brzozowski algebraic method
C
- CLI-based maze-game
- Carmichael lambda function
- Centroid of a set of N-dimensional points
- Checksumcolor
- Chess player
- Code segment unload
- Color separation
- Combinations with repetitions/Square digit chain
- Compiler/Preprocessor
- Compiler/Verifying syntax
- Conjugate a Latin verb
- Consistent overhead byte stuffing
- Continued fraction convergents
- Coprime triplets
- Create your own text control codes
D
- Data Encryption Standard
- Diophantine linear system solving
- Distinct palindromes within decimal numbers
- Divide a rectangle into a number of unequal triangles
- Doubly-linked list/Element removal
E
- Elevator simulation
- Erdős–Woods numbers
- Execute CopyPasta Language
- Exponential digital sums
- Extended Straddling Checkerboard
F
G
- Generalised floating point multiplication
- Getting the number of decimal places
- Goodstein Sequence
- Greed
H
I
J
L
- L-system
- Largest palindrome product
- Latin Squares in reduced form/Randomizing using Jacobson and Matthews' technique
- Launch rocket with countdown and acceleration in stdout
- Line circle intersection
- Longest palindromic substrings
- Lucas-Carmichael numbers
M
- Make a backup file
- McNaughton-Yamada-Thompson algorithm
- Montgomery reduction
- Multidimensional Newton-Raphson method
- Multiton
N
O
P
- Parse EBNF
- Perceptron
- Pollard's rho algorithm
- Posit numbers/decoding
- Posit numbers/encoding
- Powerful numbers
- Price list behind API
- Process SMIL directives in XML data
- Pseudorandom number generator image
R
- Rainbow
- Range modifications
- Raster bars
- Readline interface
- Red black tree sort
- Remote agent/Agent interface
- Remote agent/Agent logic
- Remote agent/Simulation
- Resistance calculator
- Resistance network calculator
- Rice coding
- Rodrigues’ rotation formula
- Rosetta Code/List authors of task descriptions
- Rosetta Code/Run examples
- Rosetta Code/Tasks without examples
- Run as a daemon or service
S
- Sanitize user input
- Segmentation fault protection
- Selection bias in clinical sciences
- Shape-Machine
- Sierpinski curve
- Simulated optics experiment/Data analysis
- Simulated optics experiment/Simulator
- Singly-linked list/Element removal
- Smallest enclosing circle problem
- Smallest power of 6 whose decimal expansion contains n
- Solve a Rubik's cube
- Solve equations with substitution method
- Solving coin problems
- Special factorials
- Special pythagorean triplet
- Spoof game
- Statistics/Chi-squared distribution
- Sturmian word
- Substring primes
- Sum data type
- Szymański's algorithm
T
- Tamagotchi emulator
- Terminal control/Restricted width positional input/No wrapping
- Terminal control/Restricted width positional input/With wrapping
- Tetris
- Text completion
- Text to HTML
- Time conventions and conversions
U
- URL shortener
- Unicode polynomial equation
- Unit testing
- Uno (card game)
- Upside-down numbers
- Use a REST API
- Using a speech engine to highlight words
V
W
- Waveform analysis/Doh ray me
- Waveform analysis/Top and tail
- Weather routing
- WiktionaryDumps to words
X
Tasks omitted from J
A
C
D
P
V
End of List
Again, feel free to try your hand at any of the tasks listed on this page.