# 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

- ASCII art diagram converter
- AVL tree
- Abbreviations, automatic
- Abbreviations, easy
- Abelian sandpile model
- 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
- Arbitrary-precision integers (included)
- Arena storage pool
- Arithmetic-geometric mean/Calculate Pi
- Assertions
- Attractive numbers
- Average loop length

### B

- Balanced ternary
- Base64 decode data
- Bell numbers
- Bernoulli numbers
- Bioinformatics/Sequence mutation
- Bioinformatics/base count
- 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

### C

- CUSIP
- Calendar
- Calendar - for "REAL" programmers
- 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
- Checkpoint synchronization
- Chernick's Carmichael numbers
- Chinese remainder theorem
- Chowla numbers
- Color of a screen pixel
- Color quantization
- 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
- Create a file
- 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 has all the same characters
- Determine if a string is collapsible
- Determine if a string is squeezable
- Determine if only one instance is running
- Digital root/Multiplicative digital root
- Dining philosophers
- Documentation
- Draw a pixel

### E

### F

- FASTA format
- FTP
- Faces from a mesh
- Factorial base numbers indexing permutations of a collection
- Farey sequence
- Fermat numbers
- File extension is in extensions list
- Find largest left truncatable prime in a given base
- First-class functions/Use numbers analogously
- First class environments
- First power of 2 that has leading decimal digits of 12
- Fixed length records
- Formal power series
- Four is the number of letters in the ...
- Fraction reduction
- Function frequency

### G

### H

### I

- 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
- Iterated digits squaring

### K

### L

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

### M

- MD5
- MD5/Implementation
- Machine code
- Mad Libs
- Magic squares of singly even order
- Matrix Digital Rain
- Matrix chain multiplication
- Median filter
- Mertens function
- Metallic ratios
- Metered concurrency
- Metronome
- Minesweeper game
- Minimal steps down to 1
- Modular exponentiation
- Multiplicative order
- Munching squares
- Mutex

### N

### O

### P

- P-value correction
- Palindrome dates
- Palindromic gapful numbers
- Paraffins
- Parallel Brute Force
- Parametrized SQL statement
- Parse an IP Address
- Partition an integer X into N primes
- 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
- 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
- Plot coordinate pairs
- Polynomial long division
- Polynomial regression
- Pragmatic directives
- Prime conspiracy
- Primes - allocate descendants to their ancestors
- Primorial numbers
- Priority queue
- Problem of Apollonius

### R

- RIPEMD-160
- RSA code
- Ramanujan's constant
- Random number generator (device)
- Rare numbers
- Read a specific line from a file
- Record sound
- Remove lines from a file
- 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
- SOAP
- SQL-based authentication
- Safe addition
- Safe primes and unsafe primes
- Same Fringe
- Scope/Function names and labels
- Secure temporary file
- Self-referential sequence
- Semiprime
- 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 primes by trial division
- Sequence of primorial primes
- Set of real numbers
- Set puzzle
- Sexy primes
- Shoelace formula for polygonal area
- 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 numbers lexicographically
- Sorting algorithms/Bead sort
- Sorting algorithms/Patience sort
- 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
- String comparison
- Strip block comments
- Strong and weak primes
- Subleq
- 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
- 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.

### 2

### A

### B

### C

- Card shuffles
- Chebyshev coefficients
- Check input device is a terminal
- Check output device is a terminal
- Checksumcolor
- Chemical Calculator
- Chess player
- Cipolla's algorithm
- Circular primes
- Code segment unload
- Color wheel
- Combinations with repetitions/Square Digit Chain
- Compiler/ Verifying Syntax
- Continued fraction/Arithmetic/G(matrix NG, Contined Fraction N)
- Continued fraction/Arithmetic/G(matrix NG, Contined Fraction N1, Contined Fraction N2)
- Copy stdin to stdout
- Curve that touches three points
- Cycle detection

### D

### E

### F

- Factorions
- Faulhaber's formula
- Feigenbaum constant calculation
- Fibonacci heap
- Fibonacci matrix-exponentiation
- File size distribution
- Find URI in text
- Find duplicate files
- Find first and last set bit of a long integer
- Find the intersection of a line with a plane
- Fivenum
- Free polyominoes enumeration
- French Republican calendar

### G

### I

### L

- Latin Squares in reduced form/Randomizing using Jacobson and Matthews’ Technique
- Launch rocket with countdown and acceleration in stdout
- Length of an arc between two angles
- Levenshtein distance/Alignment
- Line circle intersection
- Linux CPU utilization
- Logistic Curve Fitting in Epidemiology
- Long literals, with continuations

### M

- Magnanimous numbers
- Make a backup file
- Markov chain text generator
- Mayan calendar
- Mersenne primes
- Minimum positive multiple in base 10 using only 0 and 1
- Modular arithmetic
- Montgomery reduction
- Morpion solitaire
- Most frequent k chars distance
- Multidimensional Newton-Raphson method
- Multiline shebang
- Musical scale
- Möbius function

### N

### P

### R

- Railway circuit
- Ramsey's theorem
- Raster bars
- Read a file character by character/UTF8
- Readline interface
- Recursive descent parser generator
- Remote agent/Agent interface
- Remote agent/Agent logic
- Remote agent/Simulation
- Repeat
- 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 sorted by average lines of code
- 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
- Snake And Ladder
- Solve a Rubik's Cube
- Solving coin problems
- Sorting Algorithms/Circle Sort
- Sorting algorithms/Cycle sort
- Sorting algorithms/Tree sort on a linked list
- Spoof game
- Starting a web browser
- Subset sum problem
- Substitution Cipher
- Suffix tree
- Sum data type

### T

### U

## 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.