# Reports:Tasks not implemented in Swift

**Awareness**

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## Contents

## Not implemented[edit]

These are currently not implemented in Swift. Please implement some if you can. If any tasks are not possible or too complex in Swift, they should not be on this list. To mark a task as such, add **{{omit from|Swift}}**, 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
- Abbreviations, simple
- Abelian sandpile model
- Abelian sandpile model/Identity
- Abstract type
- Active Directory/Connect
- Active Directory/Search for a user
- Almkvist-Giullera formula for pi
- Amb
- Anagrams/Deranged anagrams
- Animate a pendulum
- Animation
- Append a record to the end of a text file
- Apply a digital filter (direct form II transposed)
- Arbitrary-precision integers (included)
- Archimedean spiral
- Arena storage pool
- Arithmetic-geometric mean/Calculate Pi
- Arithmetic evaluation
- Average loop length
- Averages/Median
- Averages/Pythagorean means

### B

- Balanced ternary
- Base64 decode data
- Best shuffle
- Bin given limits
- Binary strings
- Biorhythms
- Bitcoin/address validation
- Bitcoin/public point to address
- Bitmap
- Bitmap/Bresenham's line algorithm
- Bitmap/Bézier curves/Cubic
- 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
- Box the compass
- Brace expansion
- Brazilian numbers
- Brownian tree
- Bulls and cows/Player

### C

- CSV data manipulation
- CSV to HTML translation
- Calendar - for "REAL" programmers
- Calkin-Wilf sequence
- Call a function in a shared library
- Canny edge detector
- Canonicalize CIDR
- Cantor set
- Casting out nines
- Catalan numbers/Pascal's triangle
- Catmull–Clark subdivision surface
- Chaocipher
- Chaos game
- Chat server
- Check Machin-like formulas
- Check input device is a terminal
- Check output device is a terminal
- Check that file exists
- Checkpoint synchronization
- Chernick's Carmichael numbers
- Chinese zodiac
- Circular primes
- Cistercian numerals
- Collections
- Color of a screen pixel
- Color quantization
- Color wheel
- Colour bars/Display
- Colour pinstripe/Display
- Colour pinstripe/Printer
- Compare a list of strings
- Compare sorting algorithms' performance
- Compile-time calculation
- Compiler/AST interpreter
- Compiler/code generator
- Compiler/lexical analyzer
- Compiler/syntax analyzer
- Compiler/virtual machine interpreter
- Conditional structures
- Conjugate transpose
- Continued fraction/Arithmetic/Construct from rational number
- Convert decimal number to rational
- Convert seconds to compound duration
- Copy stdin to stdout
- Cramer's rule
- Create a file
- Create a file on magnetic tape
- Create an HTML table
- Cuban primes
- Cut a rectangle
- Cyclotomic polynomial

### D

- DNS query
- Damm algorithm
- Date manipulation
- De Bruijn sequences
- Death Star
- Deconvolution/1D
- Deconvolution/2D+
- Deepcopy
- Define a primitive data type
- Delete a file
- Determinant and permanent
- Determine if a string has all the same characters
- Determine if a string has all unique characters
- Determine if a string is squeezable
- Determine if two triangles overlap
- Dice game probabilities
- Digital root
- Digital root/Multiplicative digital root
- Dinesman's multiple-dwelling problem
- Dining philosophers
- Display a linear combination
- Display an outline as a nested table
- Distributed programming
- Diversity prediction theorem
- Doubly-linked list/Definition
- Doubly-linked list/Element definition
- Doubly-linked list/Element insertion
- Doubly-linked list/Traversal
- Dragon curve
- Draw a clock
- Draw a cuboid
- Draw a pixel
- Draw a rotating cube
- Dutch national flag problem

### E

- EKG sequence convergence
- Eban numbers
- Echo server
- Eertree
- Egyptian fractions
- Element-wise operations
- Elementary cellular automaton
- Elementary cellular automaton/Infinite length
- Elementary cellular automaton/Random Number Generator
- Elliptic Curve Digital Signature Algorithm
- Elliptic curve arithmetic
- Empty directory
- Entropy/Narcissist
- Euler's identity
- Events
- Executable library
- Execute HQ9+
- Execute SNUSP
- Execute a system command
- Exponentiation order
- Exponentiation with infix operators in (or operating on) the base
- Extend your language

### F

- FASTA format
- FTP
- Faces from a mesh
- Factorial base numbers indexing permutations of a collection
- Fairshare between two and more
- Faulhaber's formula
- Faulhaber's triangle
- Fermat numbers
- Fibonacci n-step number sequences
- Fibonacci word/fractal
- File extension is in extensions list
- File input/output
- File modification time
- File size
- File size distribution
- Find duplicate files
- Find the intersection of a line with a plane
- Find the missing permutation
- First-class functions/Use numbers analogously
- First class environments
- First perfect square in base n with n unique digits
- Five weekends
- Fivenum
- Fixed length records
- Flow-control structures
- Floyd's triangle
- Floyd-Warshall algorithm
- Forest fire
- Fork
- Formal power series
- Formatted numeric output
- Four is magic
- Four is the number of letters in the ...
- Fraction reduction
- French Republican calendar
- Function frequency

### G

- GUI/Maximum window dimensions
- GUI component interaction
- GUI enabling/disabling of controls
- Galton box animation
- Gamma function
- Gauss-Jordan matrix inversion
- General FizzBuzz
- Generate Chess960 starting position
- Generate random chess position
- Globally replace text in several files
- Go Fish
- Graph colouring
- Grayscale image
- Greyscale bars/Display

### H

- HTTPS/Authenticated
- HTTPS/Client-authenticated
- Hamming numbers
- Hello world/Web server
- Here document
- Hickerson series of almost integers
- Hilbert curve
- Hofstadter Figure-Figure sequences
- Holidays related to Easter
- Honeycombs
- Horizontal sundial calculations
- Host introspection
- Hough transform
- Humble numbers
- Hunt the Wumpus

### I

- IBAN
- Idiomatically determine all the characters that can be used for symbols
- Idiomatically determine all the lowercase and uppercase letters
- Image convolution
- Image noise
- Imaginary base numbers
- Include a file
- Increasing gaps between consecutive Niven numbers
- Index finite lists of positive integers
- Input loop
- Interactive programming
- Intersecting number wheels
- Introspection
- Inverted index

### K

- K-d tree
- K-means++ clustering
- Kaprekar numbers
- Keyboard input/Flush the keyboard buffer
- Keyboard input/Keypress check
- Keyboard input/Obtain a Y or N response
- Keyboard macros
- Knapsack problem/Continuous
- Knapsack problem/Unbounded
- Knuth's power tree
- Koch curve
- Kolakoski sequence
- Kronecker product based fractals

### L

- LU decomposition
- Largest int from concatenated ints
- Largest number divisible by its digits
- Last letter-first letter
- Latin Squares in reduced form
- Latin Squares in reduced form/Randomizing using Jacobson and Matthews’ Technique
- Law of cosines - triples
- Levenshtein distance/Alignment
- List rooted trees
- Long literals, with continuations
- Long multiplication
- Longest string challenge
- Loops/Increment loop index within loop body
- Loops/With multiple ranges
- Loops/Wrong ranges
- Ludic numbers

### M

- MAC Vendor Lookup
- MD4
- MD5
- Mad Libs
- Magic 8-ball
- Magic squares of doubly even order
- Magic squares of singly even order
- Main step of GOST 28147-89
- Make directory path
- Mandelbrot set
- Mastermind
- Matrix-exponentiation operator
- Matrix chain multiplication
- Matrix digital rain
- Maximum triangle path sum
- Mayan numerals
- Maze solving
- Median filter
- Memory allocation
- Memory layout of a data structure
- Merge and aggregate datasets
- Metallic ratios
- Metaprogramming
- Metered concurrency
- Metronome
- Mind boggling card trick
- Minesweeper game
- Minimal steps down to 1
- Minkowski question-mark function
- Modified random distribution
- Modular arithmetic
- Monads/List monad
- Monads/Maybe monad
- Monads/Writer monad
- Morse code
- Mouse position
- Multi-dimensional array
- Multiple regression
- Multiplication tables
- Multiplicative order
- Multisplit
- Munching squares
- Musical scale
- Mutex

### N

- Naming conventions
- Natural sorting
- Nautical bell
- Negative base numbers
- Nested templated data
- Next highest int from digits
- Nim game
- Non-continuous subsequences
- Non-decimal radices/Input
- Non-decimal radices/Output
- Non-transitive dice
- Nonogram solver
- Number reversal game
- Numeric error propagation
- Numerical and alphabetical suffixes
- Numerical integration/Gauss-Legendre Quadrature

### O

### P

- P-Adic numbers, basic
- P-Adic square roots
- P-value correction
- Padovan n-step number sequences
- Palindromic gapful numbers
- Pancake numbers
- Paraffins
- Parallel brute force
- Parametrized SQL statement
- Parse an IP Address
- Parsing/RPN to infix conversion
- Partial function application
- Partition function P
- Pascal's triangle/Puzzle
- Pascal matrix generation
- Pathological floating point problems
- Peano curve
- Penney's game
- Pentagram
- Percolation/Mean cluster density
- Percolation/Mean run density
- Percolation/Site percolation
- Permutation test
- Permutations/Derangements
- Permutations/Rank of a permutation
- Pi
- Pierpont primes
- Pig the dice game
- Pig the dice game/Player
- Pinstripe/Display
- Pinstripe/Printer
- Pisano period
- Plasma effect
- Playfair cipher
- Plot coordinate pairs
- Pointers and references
- Poker hand analyser
- Polyspiral
- Pragmatic directives
- Primality by Wilson's theorem
- Prime conspiracy
- Primes - allocate descendants to their ancestors
- Primorial numbers
- Probabilistic choice
- Program name
- Program termination
- Pseudo-random numbers/Combined recursive generator MRG32k3a
- Pseudo-random numbers/PCG32
- Pseudo-random numbers/Xorshift star
- Pythagoras tree

### R

- RCRPG
- RPG attributes generator
- RSA code
- Ramanujan's constant
- Random Latin squares
- Random number generator (device)
- Random number generator (included)
- Random numbers
- Random sentence from book
- Range consolidation
- Range expansion
- Ranking methods
- Rare numbers
- Rate counter
- Ray-casting algorithm
- Read a configuration file
- Read a file character by character/UTF8
- Read a file line by line
- Read a specific line from a file
- Recaman's sequence
- Record sound
- Reflection/Get source
- Reflection/List methods
- Reflection/List properties
- Remove lines from a file
- Rename a file
- Rendezvous
- Resistor mesh
- Retrieve and search chat history
- Roots of a function
- Roots of a quadratic function
- Roots of unity
- Rosetta Code/Count examples
- Rosetta Code/Find bare lang tags
- Rosetta Code/Find unimplemented tasks
- Rosetta Code/Fix code tags
- Rosetta Code/Rank languages by number of users
- Rosetta Code/Rank languages by popularity
- Runtime evaluation/In an environment

### S

- S-expressions
- SEDOLs
- SHA-1
- SHA-256
- SHA-256 Merkle tree
- SOAP
- SQL-based authentication
- Sailors, coconuts and a monkey problem
- Same fringe
- Scope/Function names and labels
- Scope modifiers
- Secure temporary file
- Self numbers
- Send an unknown method call
- Send email
- Sequence: nth number with exactly n divisors
- Sequence of non-squares
- Set consolidation
- Set of real numbers
- Set puzzle
- Seven-sided dice from five-sided dice
- Sexy primes
- Shell one-liner
- Shortest common supersequence
- Show ASCII table
- Show the epoch
- Sierpinski pentagon
- Sierpinski triangle/Graphical
- Simple database
- Simple windowed application
- Simulate input/Keyboard
- Simulate input/Mouse
- Singly-linked list/Element insertion
- Singly-linked list/Traversal
- Sockets
- Sokoban
- Solve a Hidato puzzle
- Solve a Holy Knight's tour
- Solve a Hopido puzzle
- Solve a Numbrix puzzle
- Solve the no connection puzzle
- Sort an outline at every level
- Sort stability
- Sorting algorithms/Bead sort
- Sorting algorithms/Counting sort
- Sorting algorithms/Patience sort
- Sorting algorithms/Permutation sort
- Sorting algorithms/Radix sort
- Sorting algorithms/Strand sort
- Soundex
- Sparkline in unicode
- Special characters
- Special variables
- Spinning rod animation/Text
- Spiral matrix
- Square Form Factorization
- Stack traces
- State name puzzle
- Statistics/Basic
- Statistics/Normal distribution
- Stem-and-leaf plot
- Stirling numbers of the first kind
- Stirling numbers of the second kind
- Straddling checkerboard
- Strassen's algorithm
- Stream merge
- Strip comments from a string
- Strip control codes and extended characters from a string
- Strip whitespace from a string/Top and tail
- Substitution cipher
- Subtractive generator
- Successive prime differences
- Suffixation of decimal numbers
- Sum and product puzzle
- Sum to 100
- Summarize and say sequence
- Sunflower fractal
- Superellipse
- Superpermutation minimisation

### T

- Table creation/Postal addresses
- Tarjan
- Taxicab numbers
- 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
- Ternary logic
- Test integerness
- Text processing/1
- Text processing/2
- Text processing/Max licenses in use
- The ISAAC Cipher
- The Name Game
- Thue-Morse
- Tonelli-Shanks algorithm
- Topic variable
- Topswops
- Total circles area
- Totient function
- Tree datastructures
- Tree from nesting levels
- Trigonometric functions
- Truncate a file
- Truth table
- Twelve statements

### U

### V

- Validate International Securities Identification Number
- Variable-length quantity
- Variable size/Set
- Vector
- Verify distribution uniformity/Chi-squared test
- Verify distribution uniformity/Naive
- Video display modes
- Vigenère cipher/Cryptanalysis
- Visualize a tree
- Vogel's approximation method
- Voronoi diagram

### 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 Swift (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
- Checksumcolor
- Chess player
- Cipolla's algorithm
- Code segment unload
- Combinations with repetitions/Square digit chain
- Common list elements
- Common sorted list
- Compiler/Simple file inclusion pre processor
- Compiler/Verifying syntax
- Concatenate two primes is also prime
- 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)
- Coprime triplets
- Coprimes
- Count how many vowels and consonants occur in a string
- Count the coins/0-1
- Cousin primes
- Create an object/Native demonstration
- Cubic Special Primes
- Curve that touches three points
- Cycle detection
- Cyclops numbers

### D

### E

### F

- Fibonacci heap
- Fibonacci matrix-exponentiation
- Find URI in text
- Find first and last set bit of a long integer
- Find first missing positive
- Find if a point is within a triangle
- Find prime n for that reversed n is also prime
- Find words which contains most consonants
- Finite state machine
- Fortunate numbers
- Free polyominoes enumeration
- Frobenius numbers

### G

### I

### L

### M

- Make a backup file
- Maximum difference between adjacent elements of list
- Mayan calendar
- Mersenne primes
- Mine a bitcoin
- Minimum number of cells after, before, above and below NxN squares
- Minimum positive multiple in base 10 using only 0 and 1
- Montgomery reduction
- Morpion solitaire
- Most frequent k chars distance
- Multi-base primes
- Multidimensional Newton-Raphson method
- Multiline shebang
- Möbius function

### N

- NYSIIS
- Names to numbers
- Neighbour primes
- Next special primes
- Nice primes
- Numbers divisible by their individual digits, but not by the product of their digits.
- 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 binary and ternary digit sum are prime
- Numbers which count of divisors is prime
- Numbers with prime digits whose sum is 13
- Numbers with same digit set in base 10 and base 16
- Numeric separator syntax
- Numerical integration/Adaptive Simpson's method

### P

- Palindromic primes
- Palindromic primes in base 16
- Parse EBNF
- Parse command-line arguments
- Particle swarm optimization
- Penrose tiling
- Pentomino tiling
- Perceptron
- Permutations with repetitions
- Permutations with some identical elements
- 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
- Primes which contain only one odd number
- Primes which sum of digits is 25
- 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
- Product of divisors
- Proof
- Pseudo-random numbers/Splitmix64
- Pseudorandom number generator image

### R

- 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 file lines
- Reverse the gender of a string
- 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
- Separate the house number from the street name
- Shift list elements to left by 3
- Show the (decimal) value of a number of 1s appended with a 3, then squared
- Sierpinski arrowhead curve
- Sierpinski curve
- Sierpinski square curve
- Simple turtle graphics
- Simulated annealing
- Sine wave
- Singly-linked list/Element removal
- Smallest enclosing circle problem
- Smallest numbers
- Smallest power of 6 whose decimal expansion contains n
- Smallest square that begins with n
- Snake
- Snake and Ladder
- Solve a Rubik's Cube
- Solve triangle solitare puzzle
- Solving coin problems
- Sort the letters of string in alphabetical order
- Sorting algorithms/Cycle sort
- Sorting algorithms/Tree sort on a linked list
- Special factorials
- Spoof game
- Square root by hand
- Starting a web browser
- Strange numbers
- Strange plus numbers
- Subset sum problem
- Substring primes
- Suffix tree
- Sum data type
- Sum of divisors
- Sum of elements below main diagonal of matrix
- Sum of first n cubes
- Sum of the digits of n is substring of n
- Summarize primes
- Sylvester's sequence

### 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
- Two sum
- Type detection

### U

### W

## Requiring Attention[edit]

### Examples[edit]

These tasks have implementations in Swift, 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 Swift 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 Swift 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.