# Reports:Tasks not implemented in Haskell

**Awareness**

If

**Haskell**is a language you like, or are interested in, please inform your fellow members of the Haskell community; this page can't be emptied without your and their participation.

## Contents

## Not implemented[edit]

These are currently not implemented in Haskell. Please implement some if you can. If any tasks are not possible or too complex in Haskell, they should not be on this list. To mark a task as such, add **{{omit from|Haskell}}**, preserving the capitalization of the language, to that task. It will appear below under the "Not Considered" section.

### A

### B

### C

- Call an object method
- Canny edge detector
- Chernick's Carmichael numbers
- Cistercian numerals
- Color of a screen pixel
- Color wheel
- Colour pinstripe/Display
- Colour pinstripe/Printer
- Compare sorting algorithms' performance
- Compiler/AST interpreter
- Compiler/code generator
- Compiler/syntax analyzer
- Compiler/virtual machine interpreter
- Cyclotomic polynomial

### D

### F

### I

### L

### M

- Machine code
- Main step of GOST 28147-89
- Mastermind
- Matrix digital rain
- Median filter
- Memory layout of a data structure
- Merge and aggregate datasets
- Metallic ratios
- Minimal steps down to 1
- Minkowski question-mark function
- Modified random distribution
- Mouse position
- Multi-dimensional array
- Musical scale

### N

### P

- P-Adic numbers, basic
- P-Adic square roots
- P-value correction
- Pancake numbers
- Partition function P
- Pathological floating point problems
- Peaceful chess queen armies
- Peano curve
- Percolation/Mean cluster density
- Perlin noise
- Pinstripe/Display
- Pinstripe/Printer
- Plasma effect
- Play recorded sounds
- Polymorphic copy
- Pragmatic directives
- Primes - allocate descendants to their ancestors
- Pseudo-random numbers/Combined recursive generator MRG32k3a
- Pseudo-random numbers/PCG32
- Pseudo-random numbers/Xorshift star

### R

- Ramanujan's constant
- Ramer-Douglas-Peucker line simplification
- Random sentence from book
- Rare numbers
- Record sound
- Reflection/Get source
- Reflection/List methods
- Reflection/List properties
- Rendezvous
- Respond to an unknown method call
- Retrieve and search chat history
- Rosetta Code/Fix code tags
- Rosetta Code/Rank languages by number of users

### S

- SHA-256 Merkle tree
- SOAP
- SQL-based authentication
- Safe addition
- Send an unknown method call
- Simulate input/Keyboard
- Simulate input/Mouse
- Sleeping Beauty problem
- Solve a Hopido puzzle
- Solve a Numbrix puzzle
- Sorting algorithms/Cocktail sort with shifting bounds
- Spelling of ordinal numbers
- Square Form Factorization
- Stack traces
- Strassen's algorithm
- Suffixation of decimal numbers
- Sunflower fractal
- Superpermutation minimisation

### T

### Draft tasks without implementation[edit]

These tasks are drafts, meaning they largely need more work to turn them into full tasks. Perhaps you can help by trying to implement them in Haskell (after all, one of the key requirements for a task being non-draft is multiple implementations, preferably in widely different languages) but be aware that this may be difficult because of lack of definition of the task itself.

### A

### B

### C

- CLI-based maze-game
- Card shuffles
- Change e letters to i in words
- Changeable words
- Chebyshev coefficients
- Checksumcolor
- Chemical calculator
- Chess player
- Cipolla's algorithm
- Code segment unload
- Combinations with repetitions/Square digit chain
- Compiler/Simple file inclusion pre processor
- Compiler/Verifying syntax
- Consecutive Primes With Ascending Or Descending Differences
- Continued fraction/Arithmetic/G(matrix ng, continued fraction n)
- Continued fraction/Arithmetic/G(matrix ng, continued fraction n1, continued fraction n2)
- Count how many vowels and consonants occur in a string
- Count the coins/0-1
- Create an object/Native demonstration
- Cubic Special Primes
- Curve that touches three points

### D

### F

- Fibonacci heap
- Find URI in text
- Find first and last set bit of a long integer
- Find if a point is within a triangle
- Find prime numbers of the form n*n*n+2
- Find words which contains all the vowels
- Find words which contains most consonants
- Find words which first and last three letters are equals
- Frobenius numbers

### G

### I

### L

### M

### N

- N-body problem
- NYSIIS
- Native shebang
- Neighbour primes
- Next special primes
- Nice primes
- Numbers in base-16 representation that cannot be written with decimal digits
- Numbers in base 10 that are palindromic in bases 2, 4, and 16
- Numbers n in which number 1 occur twice
- Numbers which count of divisors is prime
- Numbers with same digit set in base 10 and base 16
- Numeric separator syntax
- Numerical integration/Adaptive Simpson's method

### P

- Palindromic primes in base 16
- Parse command-line arguments
- Particle swarm optimization
- Penrose tiling
- Pentomino tiling
- Perceptron
- Piprimes
- Polynomial synthetic division
- Powerful numbers
- Practical numbers
- Price list behind API
- Prime numbers p which sum of prime numbers less or equal to p is prime
- Prime numbers which contain 123
- Prime triplets
- Prime words
- Primes whose first and last number is 3
- Primes with digits in nondecreasing order
- Print debugging statement
- Print itself
- Process SMIL directives in XML data
- Pseudo-random numbers/Splitmix64
- Pseudorandom number generator image

### R

- Railway circuit
- Ramsey's theorem
- Range modifications
- Raster bars
- Readline interface
- Recursive descent parser generator
- Remote agent/Agent interface
- Remote agent/Agent logic
- Remote agent/Simulation
- Resistance calculator
- Resistance network calculator
- Robots
- Rosetta Code/List authors of task descriptions
- Rosetta Code/Run examples
- Rosetta Code/Tasks without examples
- Run as a daemon or service

### S

- Safe mode
- Selective file copy
- Self-hosting compiler
- Sierpinski arrowhead curve
- Sierpinski curve
- Sierpinski square curve
- Simulated annealing
- Sine wave
- Singly-linked list/Element removal
- Smallest enclosing circle problem
- Smallest numbers
- Snake and Ladder
- Solve a Rubik's Cube
- Solve triangle solitare puzzle
- Solving coin problems
- Sorting algorithms/Cycle sort
- Sorting algorithms/Tree sort on a linked list
- Special Divisors
- Special factorials
- Spoof game
- Square root by hand
- Starting a web browser
- Strange unique prime triplets
- Substring primes
- Suffix tree
- Sum data type

### T

- Table creation
- Tamagotchi emulator
- Terminal control/Restricted width positional input/No wrapping
- Terminal control/Restricted width positional input/With wrapping
- Tetris
- Text completion
- Text to HTML
- Three word location
- Time-based one-time password algorithm
- Topological sort/Extracted top item
- Transportation problem
- Triplet of three numbers
- Twin primes
- Two bullet roulette
- Type detection

### U

### W

## Requiring Attention[edit]

### Examples[edit]

These tasks have implementations in Haskell, but somebody, somewhere, decided that the example implementation was faulty or in some other way requiring attention. If you're familiar with the task and language, please consider reviewing/correcting the example and removing the notice.

### Other pages[edit]

These are other pages related to Haskell which require attention; with your knowledge and assistance, we can improve the quality of the site's content.

### No pages found.

## Not Considered[edit]

These tasks are not generally counted toward "unimplemented", as somebody, somewhere, decided that Haskell was inappropriate for these tasks, or implementations of them would be unenlightening. Feel free to try your hand at them anyway.

## End of List[edit]

Again, feel free to try your hand at any of the tasks listed on this page.