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Daily Coding Problems

My collection of solutions to programming challenges, usually bite-sized prompts, with some creative license taken accordingly.

Collected from various providers, attributions made where possible.

2022

2021

2020

2016

2015

Click above calendars for interactive versions

Providers

Provider Total % Latest
Codewars 1453 76.59% Regexp Basics - is it all whitespace?
LeetCode 46 2.42% Find the Longest Substring Containing Vowels in Even Counts
DailyCoding 354 18.66% Random Not From List
Arbitrary 42 2.21% Maze Directional Navigation
Pramp 1 0.05% Getting a Different Number
CodingDojo 1 0.05% Poker Hands

Languages

Language Total % Latest
Python 485 23.66% Regexp Basics - is it all whitespace?
JavaScript 1429 69.71% Regexp Basics - is it all whitespace?
C# 24 1.17% Hidden "Cubic" numbers
Ruby 23 1.12% Enumerable Magic #21 - Filter that Array!
Java 22 1.07% Dude, my computer cannot count!
C 2 0.1% Reverse list recursively
Lua 2 0.1% Lua is easy: Lesson 2 - Control structures
PostgreSQL 31 1.51% Easy SQL: Bit Length
TypeScript 25 1.22% Playing with passphrases
PHP 4 0.2% Remove String Spaces
Shell 2 0.1% Convert month name to number
C++ 1 0.05% Return location

Problems

Total: 1897

Provider Title Solutions
Codewars Regexp Basics - is it all whitespace? PythonJavaScript
Codewars draw me a chessboard PythonJavaScript
Codewars multiFilter JavaScript
Codewars Magic The Gathering #2: Mana JavaScript
Codewars Keep the Order JavaScript
Codewars 80's Kids #5: You Can't Do That on Television JavaScript
Codewars zipWith JavaScript
Codewars Does array x contain all values within array y? JavaScript
Codewars Sum of Pairs JavaScript
Codewars Adding words - Part I JavaScript
Codewars Adding Binary Numbers JavaScript
Codewars Write out expression! JavaScript
Codewars Sum a list but ignore any duplicates JavaScript
Codewars Valid number to 2 decimal places JavaScript
Codewars Hidden "Cubic" numbers C#JavaScript
Codewars One line task: Square Every Digit JavaScript
Codewars No ifs no buts JavaScript
Codewars Distance from the average C#JavaScript
Codewars The Queen Of Hearts Challenge JavaScript
Codewars Ho Ho Ho with Functions! JavaScript
Codewars Not above the one! JavaScript
Codewars A Promise is a Promise JavaScript
Codewars Is There an Odd Bit? JavaScript
Codewars Conway's Look and Say - Generalized JavaScript
Codewars Parse a linked list from a string JavaScript
Codewars What comes after? JavaScript
Codewars Ziiiiip! JavaScript
Codewars Nothing special JavaScript
Codewars Implementing a Queue JavaScript
Codewars Unknown amount of duplicates. One missing number. JavaScript
Codewars 1's, 0's and wildcards JavaScript
Codewars Cyclops numbers JavaScript
Codewars Thinkful - Object Drills: Vectors JavaScript
Codewars The unknown but known variables: Addition JavaScript
Codewars Remove the parentheses JavaScript
Codewars Simple Fun #41: Elections Winners JavaScript
Codewars Arrays Similar JavaScript
Codewars Simple string indices JavaScript
Codewars Sort Strings by Most Contiguous Vowels JavaScript
Codewars RoboScript #1 - Implement Syntax Highlighting C#JavaScript
Codewars Perfect Square. JavaScript
Codewars Smart Sum JavaScript
Codewars Find the Nexus of the Codewars Universe JavaScript
Codewars How fast can the burglar steal all the diamonds? JavaScript
Codewars Trimming a string JavaScript
Codewars How Many Unique Consonants? JavaScript
Codewars Free pizza JavaScript
Codewars Combinator Flip JavaScript
Codewars Alternating Loops JavaScript
Codewars Address Book by State JavaScript
Codewars Assemble string JavaScript
Codewars Run your String JavaScript
Codewars Make a square box! JavaScript
Codewars Doubleton number C#JavaScript
Codewars Frequency sequence JavaScript
Codewars Help Grinch steal Christmas from JS programmers JavaScript
Codewars More Zeros than Ones JavaScript
Codewars Euclidean distance in n dimensions JavaScript
Codewars Remove the noise from the string JavaScript
Codewars Number of anagrams in an array of words JavaScript
Codewars Game Hit the target - 2nd part JavaScript
Codewars The Book of Mormon JavaScript
Codewars Count the photos! JavaScript
Codewars Simple Fun #8: Kill K-th Bit JavaScript
Codewars Hex Hash Sum JavaScript
Codewars Character Concatenation JavaScript
Codewars Grains JavaScript
Codewars Excel sheet column numbers JavaScript
Codewars Swap items in a dictionary JavaScript
Codewars Are there doubles? JavaScript
Codewars Supernatural JavaScript
Codewars Reduce My Fraction JavaScript
Codewars Remove B M W JavaScript
Codewars Unscrambled eggs JavaScript
Codewars Spelling Bee JavaScript
Codewars Strange principal JavaScript
Codewars Ball and Cups JavaScript
Codewars Train to remove duplicates from an array with filter() JavaScript
Codewars HTML dynamic color string generation JavaScript
Codewars Common Substrings JavaScript
Codewars 80's Kids #2: Help ALF Find His Spaceship JavaScript
Codewars Musical Pitch Classes JavaScript
Codewars Comfortable words JavaScript
Codewars Simple fibonacci strings JavaScript
Codewars Coding 3min : Remove screws I C#JavaScript
Codewars Multiply array values and filter non-numeric JavaScript
Codewars Guess the Sequence JavaScript
Codewars Difference between biggest 2 numbers JavaScript
Codewars Fun with trees: max sum JavaScript
Codewars Look and say numbers JavaScript
Codewars Replace every nth JavaScript
Codewars Thinking & Testing: A and B? JavaScript
Codewars Happy numbers JavaScript
Codewars Ackermann Function JavaScript
Codewars String character frequency JavaScript
Codewars Largest Elements JavaScript
Codewars Find character JavaScript
Codewars Character counts JavaScript
Codewars Most valuable character JavaScript
Codewars first character that repeats JavaScript
Codewars Complete Fibonacci Series JavaScript
Codewars Especially Joyful Numbers JavaScript
Codewars Find the unique number JavaScript
Codewars Strings: starts with Python
Codewars Grill it! JavaScript
Codewars Who won the election? JavaScript
Codewars Count the Ones JavaScript
Codewars Guess the number! JavaScript
Codewars Walking in the hallway JavaScript
Codewars Ordinal Numbers JavaScript
Codewars Crack the PIN JavaScript
Codewars Halloween: trick or treat! JavaScript
Codewars Collatz JavaScript
Codewars Simple Fun #170: Sum Groups JavaScript
Codewars Is Undefined? JavaScript
Codewars ASCII Fun #2: Funny Dots JavaScript
Codewars Element equals its index JavaScript
Codewars Loose Change! JavaScript
Codewars Lowercase strings in array JavaScript
Codewars Array combinations JavaScript
Codewars Array intersect all JavaScript
Codewars bread sandwiches JavaScript
Codewars Defining getters and setters on an existing class JavaScript
Codewars Ascend, Descend, Repeat? JavaScript
Codewars Parse bank account number JavaScript
Codewars Olympic Rings JavaScript
Codewars Can you get the loop ? JavaScript
Codewars Oh, so you like programming? Name all of the keywords! Python
Codewars Find the Square Root JavaScript
Codewars Array.diff hero JavaScript
Codewars Return 1, 2, 3 randomly JavaScript
Codewars Bananas JavaScript
Codewars Numericals of a String JavaScript
Codewars Turn String Input into Hash JavaScript
Codewars Which color is the brightest? JavaScript
Codewars Condensentences JavaScript
Codewars Simple time difference JavaScript
Codewars Sort the columns of a csv-file JavaScript
Codewars Catalog JavaScript
Codewars Simple Sentences JavaScript
Codewars Which string is worth more? JavaScript
Codewars Sorting on planet Twisted-3-7 JavaScript
Codewars Create iterator JavaScript
Codewars Rank Vector JavaScript
Codewars Alphabetize a list by the nth character JavaScript
Codewars search in multidimensional array JavaScript
Codewars Sorting by bits JavaScript
Codewars Birthday II - Presents JavaScript
Codewars 2D Cellular Neighbourhood JavaScript
Codewars Integers: Recreation One JavaScript
Codewars Folding your way to the moon JavaScript
Codewars Cesr*d Strings JavaScript
Codewars Speed Control JavaScript
Codewars uniq -c (UNIX style) JavaScript
Codewars Mean Square Error JavaScript
Codewars uniq (UNIX style) JavaScript
Codewars Manhattan Distance JavaScript
Codewars Make a spiral JavaScript
Codewars Rotate an array matrix JavaScript
Codewars Back and forth then Reverse! JavaScript
Codewars Sorting Arrays by the Amount of Perfect Squares that Each Element May Generate JavaScript
Codewars Duplicate sandwich JavaScript
Codewars Explosive Sum JavaScript
Codewars The observed PIN JavaScript
Codewars Naughty or Nice? JavaScript
Codewars letters only, please! JavaScript
Codewars Count consonants C#JavaScript
Codewars Combine objects JavaScript
Codewars SillyCASE JavaScript
Codewars Transpose two strings in an array JavaScript
Codewars Equalize the array! JavaScript
Codewars Playing with Sets : Intersection JavaScript
Codewars They're good dogs. JavaScript
Codewars SHA-256 JavaScript
Codewars File Path Operations JavaScript
Codewars Decipher this! JavaScript
Codewars Consecutive letters JavaScript
Codewars Numbers to Letters JavaScript
Codewars Evens and Odds JavaScript
Codewars Middle Me JavaScript
Codewars Tea for two JavaScript
Codewars Defuse the bombs! JavaScript
Codewars How can I throw an error here? JavaScript
Codewars Grid index JavaScript
Codewars Row of the odd triangle JavaScript
Codewars Strange mathematics JavaScript
Codewars Driving School Series #1 JavaScript
Codewars isAN(value) JavaScript
Codewars Excessively Abundant Numbers JavaScript
Codewars Adding ordinal indicator suffixes to numbers JavaScript
Codewars Calculate Meal Total JavaScript
Codewars More than one way to call a function, or skin a cat. JavaScript
Codewars Map over a list of lists JavaScript
Codewars Broken sequence JavaScript
Codewars Simple frequency sort JavaScript
Codewars Show multiples of 2 numbers within a range JavaScript
Codewars Who has the most money? JavaScript
Codewars Simple Encryption #1 - Alternating Split JavaScript
Codewars Message Validator JavaScript
Codewars Move 10 JavaScript
Codewars Numbers with this digit inside JavaScript
Codewars Find all occurrences of an element in an array JavaScript
Codewars We Have Liftoff JavaScript
Codewars Who is the killer? JavaScript
Codewars Changing letters JavaScript
Codewars Identical Elements JavaScript
Codewars Remove Zeros JavaScript
Codewars Twice linear JavaScript
Codewars Reverse the bits in an integer JavaScript
Codewars Vowel one JavaScript
Codewars Spoonerize Me JavaScript
Codewars Help Bob count letters and digits. JavaScript
Codewars Return String of First Characters JavaScript
Codewars Summy JavaScript
Codewars Slope of a Line JavaScript
Codewars Lottery Ticket JavaScript
Codewars SevenAte9 JavaScript
Codewars Check if two words are isomorphic to each other JavaScript
Codewars Google Dorking - Validating Queries JavaScript
Codewars Estimating Amounts of Subsets JavaScript
Codewars Plus - minus - plus - plus - ... - Count JavaScript
Codewars Lorraine Wants to Win the TV Contest JavaScript
Codewars Make acronym JavaScript
Codewars Sum The Tree JavaScript
Codewars Binary to Text (ASCII) Conversion JavaScript
Codewars Chuck Norris I - Push Ups JavaScript
Codewars Vector class JavaScript
Codewars ASCII Fun #1: X- Shape JavaScript
Codewars Execute me nTimes JavaScript
Codewars String average JavaScript
Codewars Missing and Duplicate Number JavaScript
Codewars Find min and max JavaScript
Codewars How many times should I go? JavaScript
Codewars Personalising Spammy Marketing Emails JavaScript
Codewars Merge two arrays JavaScript
Codewars Arrh, grabscrab! JavaScript
Codewars Palindrome for your Dome JavaScript
Codewars String Breakers JavaScript
Codewars Multiply Word in String JavaScript
Codewars Formatting a number as price JavaScript
Codewars Sum consecutives JavaScript
Codewars Four/Seven JavaScript
Codewars Game Hit the target JavaScript
Codewars Simple card game JavaScript
Codewars Mirror object - tcejbo rorriM JavaScript
Codewars Valid Spacing JavaScript
Codewars CompoundArray JavaScript
Codewars What dominates your array? JavaScript
Codewars Filter Coffee JavaScript
Codewars MinMaxMin: Bounded Nums JavaScript
Codewars Framed Reflection JavaScript
Codewars What's my golf score? JavaScript
Codewars Batman Quotes JavaScript
Codewars String Scramble JavaScript
Codewars The reject() function JavaScript
Codewars Count strings in objects JavaScript
Codewars Slaphead JavaScript
Codewars Complete Series JavaScript
Codewars Numbers to Objects JavaScript
Codewars Finding length of the sequence JavaScript
Codewars For the sake of argument JavaScript
Codewars Arithmetic progression JavaScript
Codewars Are they square? JavaScript
Codewars Help the Fruit Guy JavaScript
Codewars Waiting room JavaScript
Codewars Matrix creation JavaScript
Codewars Vigenère Cipher Helper JavaScript
Codewars Reverse list JavaScript
Codewars Base Conversion JavaScript
Codewars Find the Mine! JavaScript
Codewars Format words into a sentence JavaScript
Codewars Array Mappings JavaScript
Codewars Wealth equality, finally! JavaScript
Codewars What century is it? JavaScript
Codewars Consecutive Digits To Form Sum JavaScript
Codewars Linked Lists - Recursive Reverse JavaScript
Codewars Linked Lists - Remove Duplicates JavaScript
Codewars Reach Me and Sum my Digits JavaScript
Codewars The Lamp: Revisited JavaScript
Codewars Cylon Evolution JavaScript
Codewars First-Class Function Factory JavaScript
Codewars Thinkful - Object Drills: Quarks JavaScript
Codewars Number of Divisions JavaScript
Codewars Sort an array by value and index JavaScript
Codewars Kooka-Counter JavaScript
Codewars Pure Functions JavaScript
Codewars Make it equal JavaScript
Codewars Make Equal Python
Codewars Between Extremes JavaScript
Codewars Is my string repeating the same character over and over ? JavaScript
Codewars Operator overload ? JavaScript
Codewars Number-like counter JavaScript
Codewars Showing X to Y of Z Products. JavaScript
Codewars TV Remote JavaScript
Codewars All Star Code Challenge #14 - Find the median JavaScript
Codewars Count the divisible numbers JavaScript
Codewars Playing with Sets : Union JavaScript
Codewars Get decimal part of the given number JavaScript
Codewars Function iteration JavaScript
Codewars Diagonals sum JavaScript
Codewars Lazy evaluation JavaScript
Codewars Chain Evaluation JavaScript
Codewars Uncollapse Digits JavaScript
Codewars Custom each() Array method JavaScript
Codewars Search for letters JavaScript
Codewars Javascript filter - 2 JavaScript
Codewars Array.prototype.reverse() JavaScript
Codewars Sum of Array Averages JavaScript
Codewars Consecutive Vowels in a String JavaScript
Codewars Likes Vs Dislikes JavaScript
Codewars Single digit JavaScript
Codewars Swap Case Using N JavaScript
Codewars Strings: swap vowels' case JavaScript
Codewars Do you know how to make Query String? JavaScript
Codewars How many times does it contain? JavaScript
Codewars Find twins JavaScript
Codewars Where is my parent!?(cry) JavaScript
Codewars Clean up after your dog JavaScript
Codewars Katastrophe! JavaScript
Codewars Simple Web Framework #1: Create a basic router JavaScript
Codewars Get the integers between two numbers JavaScript
Codewars Sum with Arrows JavaScript
Codewars Peak array index JavaScript
Codewars Determine if the poker hand is flush JavaScript
Codewars One Line Task: Check Range JavaScript
Codewars Sum of digits JavaScript
Codewars Partition On JavaScript
Codewars Ghostbusters (whitespace removal) JavaScript
Codewars Find an employees role in the company JavaScript
Codewars Perimeter of squares in a rectangle JavaScript
Codewars So Many Permutations! JavaScript
Codewars Number of trailing zeros of N! JavaScript
Codewars Roman Numerals JavaScript
Codewars Roman Numerals Helper JavaScript
Codewars Roman Numerals Decoder JavaScript
Codewars Roman Numerals Encoder JavaScript
Codewars Least Common Multiple JavaScript
Codewars Most frequently used words in a text JavaScript
Codewars Convert A Hex String To RGB JavaScript
Codewars Email Address Obfuscator JavaScript
Codewars Reversing Fun JavaScript
Codewars Unique numbers JavaScript
Codewars Custom Array Filters JavaScript
Codewars Concatenated Sum JavaScript
Codewars Mad Max: Recursion Road JavaScript
Codewars The range() function JavaScript
Codewars Array#reduce JavaScript
Codewars Matrix Addition JavaScript
Codewars Exercise in Summing JavaScript
Codewars Test Your Knowledge Of Function Scope JavaScript
Codewars Adding useful functional functionality to JavaScript arrays JavaScript
Codewars Say "Hello World" JS Style JavaScript
Codewars Lazily executing a function JavaScript
Codewars Thinking & Testing : Something capitalized PythonJavaScript
Codewars Thinking & Testing : How many "word"? JavaScript
Codewars Thinkful - List and Loop Drills: Lists of lists JavaScript
Codewars Singleton Pattern JavaScript
Codewars Schrödinger's Boolean JavaScript
Codewars Sort Santa's Reindeer JavaScript
Codewars What is type of variable? JavaScript
Codewars Suzuki needs help lining up his students! JavaScript
Codewars The takeWhile Function JavaScript
Codewars The dropWhile Function JavaScript
Codewars The Span Function JavaScript
Codewars 99 Problems, #1: last in list JavaScript
Codewars Triangular Treasure JavaScript
Codewars How many animals are there? JavaScript
Codewars Incrementer JavaScript
Codewars Consecutive items JavaScript
Codewars Find the Missing Number JavaScript
Codewars Enumerable Magic #21 - Filter that Array! Ruby
Codewars Run-length encoding JavaScript
Codewars Find all pairs JavaScript
Codewars Javascript from the Inside #1 : Map JavaScript
Codewars Simple Fun #263: Even Numbers Before Fixed JavaScript
Codewars Array Array Array JavaScript
Codewars Cut array into smaller parts JavaScript
Codewars Dude, my computer cannot count! Java
Codewars Fix the base conversion function! Python
Codewars Count word occurrences JavaScript
Codewars Phone numbers JavaScript
Codewars Node.js Async I/O JavaScript
Codewars Promises Made and Broken: The Misadventures of Bob the Highly Paid Consultant JavaScript
Codewars I Promise Not To Optimize JavaScript
Codewars JSON Account Updater JavaScript
Codewars JSON.parse Date Reviver JavaScript
Codewars Search JSON for any key value pair JavaScript
Codewars Naughty or Nice JavaScript
Codewars Jokes you've been 'awaiting' for ... promise JavaScript
Codewars Control the Beast (controlled components in ReactJS) JavaScript
Codewars Truncate paragraph using higher-order component in React JS JavaScript
Codewars React with JSX JavaScript
Codewars Santa wish list form in ReactJS JavaScript
Codewars Unshackle the Beast (uncontrolled components in ReactJS) JavaScript
Codewars React Fun #1: Component types and nesting JavaScript
Codewars Creating Elements with React JavaScript
Codewars United State of React JavaScript
Codewars Managing Events in React JS JavaScript
Codewars Easter egg list in ReactJS JavaScript
Codewars PC upgrade specs using HOC in ReactJS JavaScript
Codewars Every archer has its arrows JavaScript
Codewars Is this working? JavaScript
Codewars Super Class Extensions JavaScript
Codewars Default + Rest + Spread JavaScript
Codewars Iterator Basics JavaScript
Codewars Create the base - Dungeon crawler #1 JavaScript
Codewars Basics - Generators #1 JavaScript
Codewars Multiplication - Generators #2 JavaScript
Codewars Fun with ES6 Classes #3 - Cuboids, Cubes and Getters JavaScript
Codewars ES2015: Build an object which can't be modified JavaScript
Codewars ES2015: Get the real length of string.  JavaScript
Codewars Filter the array into unique values in 38 chars JavaScript
Codewars Enumerable Magic #29 - Grouping Elements Together Ruby
Codewars Incorrect array_remove method Ruby
Codewars Reverse list recursively C
Codewars Circles in Polygons Python
Codewars Lua is easy: Lesson 2 - Control structures Lua
Codewars Floating point comparison Python
Codewars Sum ALL the arrays! JavaScript
Codewars Cancer cells JavaScript
Codewars Baby shark lyrics generator JavaScript
Codewars Even and Odd ! JavaScript
Codewars Ch4113ng3 JavaScript
Codewars Snakes and Ladders JavaScript
Codewars Snakes & Ladders JavaScript
Codewars Alphabetical Grid JavaScript
Codewars Turn the Mars rover to take pictures JavaScript
Codewars Simple Fun #347: Bulb Maze I JavaScript
Codewars Convert Hash To An Array JavaScript
Codewars Sum of prime-indexed elements JavaScript
Codewars Odd or Even? Determine that! JavaScript
Codewars Average Scores JavaScript
Codewars Indexed capitalization JavaScript
Codewars Recursion #1 - Factorial JavaScript
Codewars Return a string's even characters. JavaScript
Codewars Count the Characters JavaScript
Codewars NATO Phonetic Alphabet JavaScript
Codewars The old switcheroo JavaScript
Codewars Interview Question (easy) JavaScript
Codewars Kebabize JavaScript
Codewars Cat and Mouse - Easy Version JavaScript
Codewars last digits of a number JavaScript
Codewars Word values JavaScript
Codewars Pull your words together, man! JavaScript
Codewars Milk and Cookies for Santa JavaScript
Codewars Bingo ( Or Not ) JavaScript
Codewars Character Counter JavaScript
Codewars LinkedList -> Array JavaScript
Codewars Formatting decimal places #1 JavaScript
Codewars Even or Odd - Which is Greater? JavaScript
Codewars Series of integers from m to n JavaScript
Codewars Sort by Last Char JavaScript
Codewars Credit card issuer checking JavaScript
Codewars Counting in the Amazon JavaScript
Codewars Sequence generator JavaScript
Codewars How many arguments JavaScript
Codewars Pluck JavaScript
Codewars Say hello! C#
Codewars Remove All The Marked Elements of a List JavaScript
Codewars Numbers in strings JavaScript
Codewars Partial Word Searching JavaScript
Codewars Sum of integers in string JavaScript
Codewars Float Precision C#
Codewars Evens times last JavaScript
Codewars Spacify JavaScript
Codewars Compare Strings by Sum of Chars JavaScript
Codewars By 3, or not by 3? That is the question . . . JavaScript
Codewars V A P O R C O D E JavaScript
Codewars Find Count of Most Frequent Item in an Array JavaScript
Codewars Convert an array of strings to array of numbers JavaScript
Codewars Sum even numbers JavaScript
Codewars Easy mathematical callback JavaScript
Codewars Vampire Numbers JavaScript
Codewars Nth power rules them all! JavaScript
Codewars ToLeetSpeak JavaScript
Codewars Easy SQL: Bit Length PostgreSQL
Codewars Collatz Conjecture Length JavaScript
Codewars Jumping Number (Special Numbers Series #4) JavaScript
Codewars Use reduce() to calculate the sum of the values in an array JavaScript
Codewars JavaScript class-like objects JavaScript
Codewars Special Number (Special Numbers Series #5)

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