# Reports:Tasks not implemented in D

**Awareness**

If

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

## Contents

## Not implemented[edit]

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

### 2

### A

### B

### C

- Calkin-Wilf sequence
- Canonicalize CIDR
- Catmull–Clark subdivision surface
- Chaos game
- Chernick's Carmichael numbers
- Church numerals
- Cistercian numerals
- Color of a screen pixel
- Color wheel
- Colour bars/Display
- Colour pinstripe/Display
- Colour pinstripe/Printer
- Compiler/AST interpreter
- Compiler/code generator
- Compiler/lexical analyzer
- Compiler/syntax analyzer
- Compiler/virtual machine interpreter
- Currency

### F

- FASTA format
- FTP
- Faces from a mesh
- Factorial base numbers indexing permutations of a collection
- Factorions
- Fermat numbers
- File size distribution
- Find duplicate files
- Find largest left truncatable prime in a given base
- Fixed length records
- Four is magic
- Four is the number of letters in the ...
- Function frequency
- Functional coverage tree

### G

### I

### L

### M

- MAC Vendor Lookup
- Mastermind
- Matrix chain multiplication
- Matrix digital rain
- Mayan numerals
- McNuggets problem
- Merge and aggregate datasets
- Mertens function
- Metallic ratios
- Metronome
- Mian-Chowla sequence
- Mind boggling card trick
- Minimal steps down to 1
- Minkowski question-mark function
- Monads/List monad
- Monads/Maybe monad
- Monads/Writer monad
- Mouse position
- Multiple regression
- Musical scale

### N

### P

- Palindrome dates
- Palindromic gapful numbers
- Parametrized SQL statement
- Parse an IP Address
- Partition function P
- Password generator
- Pathological floating point problems
- Pattern matching
- Peano curve
- Pentagram
- Perfect totient numbers
- Pinstripe/Display
- Pinstripe/Printer
- Plasma effect
- Play recorded sounds
- Plot coordinate pairs
- Polyspiral
- Primality by Wilson's theorem
- Primes - allocate descendants to their ancestors
- Pseudo-random numbers/Combined recursive generator MRG32k3a
- Pseudo-random numbers/Xorshift star
- Pythagoras tree

### R

### S

- SHA-256 Merkle tree
- SOAP
- SQL-based authentication
- Scope/Function names and labels
- Scope modifiers
- Search a list of records
- Self numbers
- Send an unknown method call
- Sequence: nth number with exactly n divisors
- Sequence: smallest number greater than previous term with exactly n divisors
- Sequence: smallest number with exactly n divisors
- Sequence of primorial primes
- Sexy primes
- Simulate input/Keyboard
- Simulate input/Mouse
- Smarandache prime-digital sequence
- Sort a list of object identifiers
- Sort an outline at every level
- Sort numbers lexicographically
- Sorting algorithms/Cocktail sort with shifting bounds
- Special characters
- Speech synthesis
- Spelling of ordinal numbers
- Spinning rod animation/Text
- Suffixation of decimal numbers
- Sunflower fractal
- Superellipse

### 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 D (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

### C

- CLI-based maze-game
- Changeable words
- Checksumcolor
- Chess player
- Code segment unload
- Compiler/Verifying syntax
- Continued fraction/Arithmetic/G(matrix ng, continued fraction n)
- Continued fraction/Arithmetic/G(matrix ng, continued fraction n1, continued fraction n2)
- Count the coins/0-1
- Curve that touches three points

### E

### F

### G

### L

### M

### N

### P

- Parse EBNF
- Penrose tiling
- Pentomino tiling
- Perceptron
- Permutations with some identical elements
- Pisano period
- Polynomial synthetic division
- Powerful numbers
- Price list behind API
- Prime words
- Print itself
- Process SMIL directives in XML data
- Product of divisors
- Pseudo-random numbers/Splitmix64
- Pseudorandom number generator image

### R

- Railway circuit
- Range modifications
- Raster bars
- Recursive descent parser generator
- Remote agent/Agent interface
- Remote agent/Agent logic
- Remote agent/Simulation
- Resistance calculator
- Resistance network calculator
- Reverse the gender of a string
- Robots
- Rosetta Code/List authors of task descriptions
- Rosetta Code/Rank languages by number of users
- Rosetta Code/Run examples
- Run as a daemon or service

### S

- Safe mode
- Selective file copy
- Self-hosting compiler
- Separate the house number from the street name
- Sierpinski arrowhead curve
- Sierpinski curve
- Sierpinski square curve
- Simulated annealing
- Sine wave
- Singly-linked list/Element removal
- Smallest enclosing circle problem
- Snake
- Solve a Rubik's Cube
- Solving coin problems
- Sorting algorithms/Tree sort on a linked list
- Spoof game
- Starting a web browser
- Strassen's algorithm
- Sum data type
- Sum of divisors

### T

- Table creation
- Tamagotchi emulator
- Tau function
- Tau number
- 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
- Twin primes
- Two bullet roulette

### U

### W

## Requiring Attention[edit]

### Examples[edit]

These tasks have implementations in D, 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.

### C

### D

### F

### M

### P

### Other pages[edit]

These are other pages related to D 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 D 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.