# Reports:Tasks not implemented in JavaScript

**Awareness**

If

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

## Contents

## Not implemented[edit]

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

### A

- AVL tree
- Abbreviations, automatic
- Abbreviations, easy
- Abelian sandpile model
- Abelian sandpile model/Identity
- Active Directory/Connect
- Active Directory/Search for a user
- Aliquot sequence classifications
- Angles (geometric), normalization and conversion
- Append a record to the end of a text file
- Apply a digital filter (direct form II transposed)
- Approximate equality
- Arena storage pool
- Arithmetic-geometric mean/Calculate Pi
- Assertions
- Average loop length

### B

- Balanced ternary
- Base64 decode data
- Bell numbers
- Bernoulli numbers
- Biorhythms
- Bitcoin/address validation
- Bitcoin/public point to address
- 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
- Brazilian numbers
- Break OO privacy
- Bulls and cows/Player
- Burrows–Wheeler transform

### C

- Calendar - for "REAL" programmers
- Calkin-Wilf sequence
- Call a foreign-language function
- Call a function in a shared library
- Canny edge detector
- Carmichael 3 strong pseudoprimes
- Catmull–Clark subdivision surface
- Check Machin-like formulas
- Check input device is a terminal
- Check output device is a terminal
- Checkpoint synchronization
- Chernick's Carmichael numbers
- Chowla numbers
- Circular primes
- Cistercian numerals
- Color of a screen pixel
- Color quantization
- Color wheel
- Colour bars/Display
- Colour pinstripe/Display
- Colour pinstripe/Printer
- Combinations and permutations
- Commatizing numbers
- Compare sorting algorithms' performance
- Compiler/AST interpreter
- Compiler/code generator
- Compiler/virtual machine interpreter
- Conjugate transpose
- Continued fraction
- Continued fraction/Arithmetic/Construct from rational number
- Copy stdin to stdout
- Create a file on magnetic tape
- Cuban primes
- Cut a rectangle
- Cyclotomic polynomial

### D

- De Bruijn sequences
- Deconvolution/1D
- Deconvolution/2D+
- Deming's Funnel
- Determine if a string is collapsible
- Determine if a string is squeezable
- Determine if only one instance is running
- Determine if two triangles overlap
- Dice game probabilities
- Digital root/Multiplicative digital root
- Dining philosophers
- Display a linear combination
- Documentation
- Draw a pixel

### E

- EKG sequence convergence
- Eban numbers
- Eertree
- Egyptian fractions
- Element-wise operations
- Elementary cellular automaton/Infinite length
- Elementary cellular automaton/Random Number Generator
- Elliptic curve arithmetic
- Empty directory
- Entropy/Narcissist
- Euler's identity
- Executable library
- Exponentiation order
- Extend your language
- Extreme floating point values

### F

- FASTA format
- FTP
- Faces from a mesh
- Factorial base numbers indexing permutations of a collection
- Factorions
- Farey sequence
- Faulhaber's formula
- Feigenbaum constant calculation
- Fermat numbers
- File extension is in extensions list
- File size distribution
- Find duplicate files
- Find largest left truncatable prime in a given base
- Find the intersection of a line with a plane
- First class environments
- First power of 2 that has leading decimal digits of 12
- Fivenum
- Fixed length records
- Formal power series
- Four is the number of letters in the ...
- Fraction reduction
- Function frequency

### G

### H

### I

- ISBN13 check digit
- I before E except after C
- Idiomatically determine all the characters that can be used for symbols
- Idiomatically determine all the lowercase and uppercase letters
- Imaginary base numbers
- Increasing gaps between consecutive Niven numbers
- Index finite lists of positive integers
- Integer overflow
- Inverted index
- Inverted syntax
- Isqrt (integer square root) of X
- Iterated digits squaring

### K

### L

- Lah numbers
- Largest number divisible by its digits
- Last Friday of each month
- Latin Squares in reduced form
- Left factorials
- Levenshtein distance/Alignment
- Linear congruential generator
- Literals/Floating point
- Long literals, with continuations
- Long primes
- Longest string challenge
- Loops/Increment loop index within loop body
- Loops/With multiple ranges
- Loops/Wrong ranges
- Lucky and even lucky numbers
- Lychrel numbers

### M

- MD5
- MD5/Implementation
- Machine code
- Mad Libs
- Magic squares of singly even order
- Matrix chain multiplication
- Matrix digital rain
- Median filter
- Merge and aggregate datasets
- Mertens function
- Metallic ratios
- Metered concurrency
- Metronome
- Minesweeper game
- Minimal steps down to 1
- Minkowski question-mark function
- Modular arithmetic
- Modular exponentiation
- Multiplicative order
- Munching squares
- Mutex

### N

### O

### P

- P-value correction
- Palindromic gapful numbers
- Paraffins
- Parallel brute force
- Parametrized SQL statement
- Parse an IP Address
- Partition an integer x into n primes
- Partition function P
- Pascal's triangle/Puzzle
- Password generator
- Pathological floating point problems
- Pattern matching
- Peaceful chess queen armies
- Peano curve
- Pell's equation
- Penney's game
- Pentagram
- Percolation/Bond percolation
- Percolation/Mean cluster density
- Percolation/Mean run density
- Percolation/Site percolation
- Perlin noise
- Permutation test
- Permutations/Derangements
- Permutations/Rank of a permutation
- Permutations by swapping
- Pernicious numbers
- Pierpont primes
- Pig the dice game
- Pig the dice game/Player
- Pinstripe/Display
- Pinstripe/Printer
- Play recorded sounds
- Playfair cipher
- Plot coordinate pairs
- Polynomial long division
- Polynomial regression
- Pragmatic directives
- Primality by Wilson's theorem
- Prime conspiracy
- Primes - allocate descendants to their ancestors
- Primorial numbers
- Priority queue
- Problem of Apollonius
- Pseudo-random numbers/Combined recursive generator MRG32k3a
- Pseudo-random numbers/PCG32
- Pseudo-random numbers/Xorshift star

### R

- RIPEMD-160
- RSA code
- Ramanujan's constant
- Random number generator (device)
- Rare numbers
- Read a file character by character/UTF8
- Read a specific line from a file
- Record sound
- Remove lines from a file
- Repeat
- Resistor mesh
- Retrieve and search chat history
- Roots of a quadratic function
- Rosetta Code/Count examples
- Rosetta Code/Find bare lang tags
- Rosetta Code/Rank languages by popularity

### S

- SHA-1
- SHA-256 Merkle tree
- SOAP
- SQL-based authentication
- Safe addition
- Safe primes and unsafe primes
- Same fringe
- Scope/Function names and labels
- Secure temporary file
- Self numbers
- Semiprime
- Sequence: nth number with exactly n divisors
- Sequence: smallest number greater than previous term with exactly n divisors
- Sequence of primes by trial division
- Sequence of primorial primes
- Set puzzle
- Sexy primes
- Shortest common supersequence
- Simple database
- Simple windowed application
- Simulate input/Keyboard
- Simulate input/Mouse
- Smarandache prime-digital sequence
- Sockets
- Sokoban
- Solve a Hidato puzzle
- Solve a Hopido puzzle
- Solve a Numbrix puzzle
- Sort a list of object identifiers
- Sort an outline at every level
- Sort numbers lexicographically
- Sorting Algorithms/Circle Sort
- Sorting algorithms/Bead sort
- Sorting algorithms/Cocktail sort with shifting bounds
- Sorting algorithms/Permutation sort
- Sorting algorithms/Radix sort
- Sorting algorithms/Strand sort
- Spelling of ordinal numbers
- Square-free integers
- Stair-climbing puzzle
- Start from a main routine
- State name puzzle
- Statistics/Basic
- Statistics/Normal distribution
- Stirling numbers of the first kind
- Stirling numbers of the second kind
- Stream merge
- Strip block comments
- Strong and weak primes
- Subleq
- Substitution cipher
- Subtractive generator
- Successive prime differences
- Suffixation of decimal numbers
- Super-d numbers
- Superpermutation minimisation
- Synchronous concurrency

### T

- Table creation/Postal addresses
- Tarjan
- 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/Ringing the terminal bell
- Terminal control/Unicode output
- Test integerness
- Textonyms
- The ISAAC Cipher
- The Name Game
- Thiele's interpolation formula
- Tonelli-Shanks algorithm
- Topic variable
- Topswops
- Total circles area
- Totient function
- Tree datastructures
- Truncatable primes
- Truncate a file
- Twelve statements

### U

### V

### W

### 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 JavaScript (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
- Changeable words
- Chebyshev coefficients
- Checksumcolor
- Chemical calculator
- Chess player
- Cipolla's algorithm
- Code segment unload
- Combinations with repetitions/Square digit chain
- 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
- Cycle detection

### D

### E

### F

### G

### I

### L

### M

### N

### P

- Pancake numbers
- Parse EBNF
- Parse command-line arguments
- Penrose tiling
- Pentomino tiling
- Permutations with some identical elements
- Pisano period
- Polynomial synthetic division
- Powerful numbers
- Price list behind API
- Prime words
- Print debugging statement
- Print itself
- Process SMIL directives in XML data
- Product of divisors
- 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
- 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
- Rosetta Code/Tasks without 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
- Singly-linked list/Element removal
- Smallest enclosing circle problem
- 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
- Spoof game
- Square root by hand
- Starting a web browser
- Strassen's algorithm
- Subset sum problem
- 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
- Text completion
- Text to HTML
- Three word location
- Time-based one-time password algorithm
- Topological sort/Extracted top item
- Transportation problem
- Twin primes
- Two bullet roulette

### U

### W

## Requiring Attention[edit]

### Examples[edit]

These tasks have implementations in JavaScript, 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 JavaScript which require attention; with your knowledge and assistance, we can improve the quality of the site's content.

## Not Considered[edit]

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

### F

## End of List[edit]

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