Rebol3 Code Examples

1100 doorsControl flow 2100 prisonersGames 321 gameGames 424 gameGames 59 billion names of God the integerMath 6Abbreviations, automaticString 7Abbreviations, easyString 8Abbreviations, simpleString 9ABC correlationMath 10ABC problemMisc 11ABC wordsString 12Abelian sandpile model/IdentityMath 13Abundant odd numbersMath 14Achilles numbersMath 15Additive primesMath 16Almost primeMath 17Alternade wordsString 18AmbControl flow 19AnadromesString 20Anagram generatorString 21AnagramsString 22Anagrams/Deranged anagramsString 23Angle difference between two bearingsMath 24Angles (geometric), normalization and conversionMath 25Anti-primesMath 26Append numbers at same position in stringsString 27Archimedean spiralGraphics 28Arithmetic evaluationMath 29Attractive numbersMath 30Audio alarmI/O 31Audio frequency generatorI/O 32Audio overlap loopI/O 33Autogram checkerString 34Babylonian spiralGraphics 35Bacon cipherCrypto / encoding 36Balanced bracketsString 37Barnsley FernGraphics 38Bell numbersMath 39Best shuffleData structures 40Bifid cipherCrypto / encoding 41Bilinear interpolationGraphics 42Bioinformatics/Sequence mutationMisc 43BiorhythmsMath 44Bitcoin address validationCrypto / encoding 45Bitmap/Flood fillGraphics 46Bitmap/HistogramGraphics 47Bitmap/Midpoint circle algorithmGraphics 48Bitmap/Read a PPM fileI/O 49Bitmap/Write a PPM fileI/O 50Bitwise IOI/O 51Bitwise operationsMath 52BoidsGraphics 53Box the compassMisc 54Brazilian numbersMath 55Brownian treeGraphics 56Bulls and cowsGames 57Bulls and cows playerGames 58Burrows–Wheeler transformCrypto / encoding 59Caesar cipherCrypto / encoding 60Calendar - for "REAL" programmersMisc 61Call an object methodControl flow 62Camel case and snake caseString 63Card shufflesGames 64Case-sensitivity of identifiersnone 65Catalan numbersMath 66Catalan numbers/Pascal's triangleMath 67Catamorphismnone 68Changeable wordsString 69Chinese remainder theoremMath 70Chinese zodiacMisc 71Color quantization (Median cut)Graphics 72Color quantization (Octree)Graphics 73Color wheelGraphics 74Colour bars/DisplayGraphics 75Command-line argumentsnone 76Compare length of two stringsString 77Conway's Game of LifeGames 78Count in octalMath 79Count the coins/0-1Math 80Create a two-dimensional array at runtimeData structures 81Create an HTML tableString 82CSV data manipulationI/O 83CSV to HTML translationI/O 84CurrencyMath 85CUSIPMath 86Damm algorithmMath 87Deal cards for FreeCellGames 88Death StarGraphics 89DeepcopyControl flow 90Digit fifth powersMath 91Digital rootMath 92Dijkstra's algorithmMath 93Discordian datenone 94Display a linear combinationMath 95DNS queryI/O 96Doomsday ruleMisc 97Dragon curveGraphics 98Draw a clock (CLI)Graphics 99Draw a cuboidGraphics 100Draw a pixelGraphics 101Draw a sphereGraphics 102Draw a torusGraphics 103Element-wise operationsMath 104EntropyMath 105Ethiopian multiplicationMath 106Euclidean rhythmMisc 107Euler methodMath 108Euler's constant 0.5772...Math 109Evolutionary algorithmMisc 110Exactly three adjacent 3 in listsData structures 111Execute Brain****Misc 112Extend your languageMisc 113Extensible prime generatorMath 114FASTA formatI/O 115Fibonacci sequenceMath 116File extension is in extensions listString 117File modification timeI/O 118Find common directory pathString 119Find first missing positiveData structures 120Find limit of recursionControl flow 121Find prime n such that reversed n is also primeMath 122Find squares n where n+1 is primeMath 123Find unimplemented tasksMisc 124Find words with alternating vowels and consonantsenone 125First-class functions/Use numbers analogouslyControl flow 126Five weekendsMisc 127Flipping bits gamenone 128Floyd's trianglenone 129Forest fireGraphics 130Four is magicMisc 131Fractal treeGraphics 132Fraction reductionMath 133FractranMath 134Gamma functionMath 135Gapful numbersMath 136Generate lower case ASCII alphabetString 137Generate random numbers without repeating a valueData structures 138Get system command outputI/O 139Go FishGames 140Gosper's hackMisc 141Gray codeMath 142Grayscale imageGraphics 143GreedGames 144GSTrans string conversionString 145Happy numbersMath 146Harriss SpiralGraphics 147Hash joinData structures 148Hello world/Standard errorI/O 149Hello world/Web servernone 150Here documentString 151Heronian trianglesMath 152Hex dumpData structures 153Huffman codingCrypto / encoding 154I before E except after CString 155IBANMath 156Image noiseGraphics 157Include a fileControl flow 158Increment loop index within loop bodyControl flow 159InfinityMath 160Integer overflowMath 161Integer sequenceMath 162IntrospectionControl flow 163Inverted indexData structures 164ISBN13 check digitMath 165Jacobsthal numbersMath 166JSON pointerString 167Julia setGraphics 168Knapsack problem/0-1Math 169Knapsack problem/BoundedMath 170Knapsack problem/ContinuousMath 171Knapsack problem/UnboundedMath 172Knight's tourGames 173Knuth shuffleData structures 174Kronecker productMath 175Kronecker product based fractalsMath 176Largest number divisible by its digitsMath 177Leap yearMisc 178Legendre prime counting functionMath 179Letter frequencyString 180Levenshtein distanceString 181Long multiplicationMath 182Long yearMath 183Longest common suffixString 184Longest string challengeString 185Look-and-say sequenceMath 186Loops/With multiple rangesControl flow 187Loops/Wrong rangesControl flow 188Ludic numbersMath 189Luhn test of credit card numbersMath 190Lychrel numbersMath 191Lyndon wordString 192LZW compressionCrypto / encoding 193Mandelbrot setGraphics 194Markov chain text generatorString 195Mayan numeralsMisc 196Maze generationGraphics 197MD4Crypto / encoding 198Memory allocationMisc 199Minimum numbers of three listsData structures 200Minimum primesMath 201Morse codeCrypto / encoding 202MultitonMisc 203Munching squaresGraphics 204Möbius functionMath 205N'thString 206Named parametersMisc 207Naming conventionsMisc 208Natural sortingData structures 209Nautical bellMisc 210Neighbour primesMath 211Nested functionControl flow 212Nice primesMath 213Nim gameGames 214Number namesString 215Numbers divisible by their individual digits, but not by the product of their digitsMath 216Object serializationI/O 217Odd and square numbersMath 218Old lady swallowed a flyMisc 219Old Russian measure of lengthMath 220One-dimensional cellular automataControl flow 221Ordered wordsString 222Ormiston pairsMath 223Padovan n-step number sequencesMath 224Pairs with common factorsMath 225Palindrome datesMisc 226Palindrome detectionString 227Palindromic gapful numbersMath 228Palindromic primes in base 16Math 229Parsing/Shunting-yard algorithmData structures 230Partial function applicationMisc 231Pascal's triangleMath 232PentagramGraphics 233Periodic tableMisc 234Peripheral drift illusionGraphics 235Perlin noiseGraphics 236Permutation testMath 237PermutationsData structures 238Permutations with repetitionsData structures 239Permuted multiplesMath 240Phrase reversalsString 241Pick random elementMisc 242Pig the dice gameGames 243PiprimesMath 244Playing cardsGames 245Poker hand analyserGames 246Polynomial regressionMath 247PolyspiralGraphics 248Population countMath 249Prime conspiracyMath 250Priority queueData structures 251Probabilistic choiceMath 252Program nameMisc 253Pseudo-random numbers/Middle-square methodMath 254Pythagoras treeGraphics 255QuaternionMath 256Quickselect algorithmMath 257QuineMisc 258Random numbersMath 259Range expansionString 260Range extractionString 261Read a configuration fileI/O 262Read a file line by lineI/O 263Recaman's sequenceMath 264Reduced row echelon formMath 265Rep-stringString 266RepeatMisc 267Return multiple valuesControl flow 268Rock-paper-scissorsGames 269Roman numerals/DecodeMath 270Roman numerals/EncodeMath 271Rosetta Code/Rank languages by popularityMisc 272Rosetta_Code/Count_examplesMisc 273RPG attributes generatorGames 274Sattolo cycleData structures 275Search a list of recordsData structures 276Self-describing numbersMath 277SemordnilapString 278Sequence of non-squaresMath 279SHA-256 Merkle treeCrypto / encoding 280Short-circuit evaluationControl flow 281Show ASCII tableMisc 282Show the epochMisc 283Sierpinski carpetGraphics 284Sierpinski triangleGraphics 285Sieve of EratosthenesMath 286Sieve of PritchardMath 287Sleeping Beauty problemMisc 288Smallest numbersMath 289Snake and ladderGames 290Soloway's recurring rainfallMath 291Solve the no connection puzzleMisc 292Sort a list of object identifiersData structures 293Sort numbers lexicographicallyData structures 294Sort stabilityData structures 295Sort three variablesData structures 296Sort using a custom comparatorData structures 297Sorting algorithms/Bead sortData structures 298Sorting algorithms/BogosortData structures 299Sorting algorithms/Bubble sortData structures 300Sorting algorithms/Cocktail sortData structures 301Sorting algorithms/Comb sortData structures 302Sorting algorithms/Counting sortData structures 303Sorting algorithms/Gnome sortData structures 304Sorting algorithms/Insertion sortData structures 305Sorting algorithms/Patience sortData structures 306Sorting algorithms/Permutation sortData structures 307Sorting algorithms/QuicksortData structures 308Sorting algorithms/Radix sortData structures 309Sorting algorithms/Selection sortData structures 310Sorting algorithms/Shell sortData structures 311Sorting algorithms/Stooge sortData structures 312Sorting algorithms/Strand sortData structures 313SoundexString 314Sparkline in unicodeString 315Speech synthesisI/O 316Spiral matrixMath 317Stack tracesMisc 318Statistics/BasicMath 319Statistics/Normal distributionMath 320Stem-and-leaf plotData structures 321Straddling checkerboardCrypto / encoding 322String comparisonString 323String matchingString 324String prependnone 325Strip a set of characters from a stringString 326Strip block commentsString 327Strip whitespace from a string/Top and tailString 328Sub-unit squaresMath 329Substitution cipherCrypto / encoding 330Substring/Top and tailString 331Sudan functionMath 332SudokuMisc 333Sum digits of an integerMath 334Sum of a seriesMath 335Sum of first n cubesnone 336Sum of squaresMath 337Sum to 100Math 338Summation of primesMath 339Sunflower fractalGraphics 340Temperature conversionMath 341Terminal control/Restricted width positional input/No wrappingI/O 342Ternary logicMath 343Test a functionControl flow 344The sieve of SundaramMath 345The Twelve Days of ChristmasMisc 346Three word locationData structures 347Time a functionI/O 348Tokenize a string with escapingString 349Top rank per groupData structures 350Transliterate English text using the Greek alphabetString 351Truncate a fileI/O 352Twelve statementsMisc 353Two identical stringsnone 354Unicode stringsString 355Unicode variable namesMisc 356Unique charactersString 357Unique characters in each stringString 358Unix/lsI/O 359URL decodingI/O 360URL encodingI/O 361Useless instructionsControl flow 362Validate International Securities Identification NumberMath 363Variable declaration resetMisc 364VectorData structures 365Vector productsMath 366Vigenère cipherCrypto / encoding 367Voronoi diagramGraphics 368Walk a directory/Non-recursivelyI/O 369Walk a directory/RecursivelyI/O 370War card gameGames 371Water collected between towersMath 372Wave function collapseGraphics 373Word frequencyString 374Word wheelGames 375Word wrapString 376WordiffString 377Wordle comparisonGames 378Words from neighbour onesString 379Write entire fileI/O 380Write float arrays to a text fileI/O 381Write language name in 3D ASCIIGraphics 382XXXX redactedString 383Zeckendorf number representationMath 384Zig-zag matrixMath