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JavaScript katas on Codewars are programming challenges that help you improve your skills in the language. Each kata presents a specific problem for you to solve using programming techniques and algorithms. Upon completing each kata, you can compare your solution with others and receive feedback and points based on its effectiveness and efficiency.

• Binary multiple of 3
  ^{REGULAR EXPRESSIONSALGORITHMSPUZZLESNUMBER THEORY}
• Human readable duration format
  ^{STRINGSDATE TIMEALGORITHMS}
• Most frequently used words in a text
  ^{STRINGSFILTERINGALGORITHMSREGULAR EXPRESSIONS}
• Snail
  ^{ARRAYSALGORITHMS}

• By the Power Set of Castle Grayskull
  ^{MATHEMATICSALGORITHMS}
• Convert A Hex String To RGB
  ^{PARSINGSTRINGSALGORITHMS}
• Convert PascalCase string into snake_case
  ^{STRINGSALGORITHMS}
• Don't Drink the Water
  ^{ALGORITHMSARRAYSSORTINGLISTS}
• Extract the domain name from a URL
  ^{PARSINGREGULAR EXPRESSIONS}
• First non-repeating character
  ^{STRINGSALGORITHMS}
• Greed is Good
  ^ALGORITHMS
• Human Readable Time
  ^{DATE TIMEMATHEMATICSALGORITHMS}
• Josephus Survivor
  ^{MATHEMATICSCOMBINATORICSALGORITHMSLISTSARRAYS}
• Maximum subarray sum
  ^{ALGORITHMSLISTSDYNAMIC PROGRAMMINGFUNDAMENTALSPERFORMANCE}
• Mean Square Error
  ^{ARRAYSMATHEMATICSALGORITHMS}
• Moving Zeros To The End
  ^{ARRAYSSORTINGALGORITHMS}
• Not very secure
  ^{REGULAR EXPRESSIONSSTRINGS}
• Number of trailing zeros of N!
  ^{ALGORITHMSLOGICMATHEMATICS}
• Perimeter of squares in a rectangle
  ^{MATHEMATICSALGORITHMS}
• Pete, the baker
  ^ALGORITHMS
• Regex Password Validation
  ^{REGULAR EXPRESSIONSFUNDAMENTALS}
• RGB To Hex Conversion
  ^ALGORITHMS
• ROT13
  ^{STRINGSCIPHERSREGULAR EXPRESSIONSALGORITHMS}
• Rot13
  ^{CIPHERSFUNDAMENTALS}
• Scramblies
  ^{STRINGSPERFORMANCEALGORITHMS}
• Simple Fun #249: Subtraction By Regrouping
  ^PUZZLES
• Simple Pig Latin
  ^{REGULAR EXPRESSIONSALGORITHMS}
• String incrementer
  ^{REGULAR EXPRESSIONSSTRINGS}
• The Hashtag Generator
  ^{STRINGSALGORITHMS}
• Tic-Tac-Toe Checker
  ^{ARRAYSALGORITHMS}
• Value of x
  ^{STRINGSALGORITHMS}
• Weight for weight
  ^ALGORITHMS
• Where my anagrams at?
  ^{STRINGSALGORITHMS}

• Are they the "same"?
  ^FUNDAMENTALS
• Array Helpers
  ^{ARRAYSFUNDAMENTALS}
• Array.diff
  ^{ARRAYSFUNDAMENTALSALGORITHMS}
• ASCII Fun #1: X-Shape
  ^{ASCII ART}
• ASCII Fun #2: Funny Dots
  ^{ASCII ART}
• ASCII Fun #3: Puzzle Tiles
  ^{ASCII ART}
• ASCII Fun #4: Build a pyramid
  ^{ASCII ART}
• Bit Counting
  ^{BITSALGORITHMS}
• Break camelCase
  ^{STRINGSFUNDAMENTALS}
• Build a pile of Cubes
  ^{MATHEMATICSALGORITHMS}
• Build Tower!
  ^{STRINGSASCII ARTFUNDAMENTALS}
• CamelCase Method
  ^{FUNDAMENTALSALGORITHMSSTRINGS}
• Card game
  ^{ALGORITHMSGAMESSTRINGS}
• Checkered Board
  ^{STRINGSASCII ARTFUNDAMENTALS}
• Clever split
  ^{STRINGSREGULAR EXPRESSIONSFUNDAMENTALS}
• Collatz
  ^{NUMBER THEORYALGORITHMS}
• Consecutive strings
  ^FUNDAMENTALS
• Convert string to camel case
  ^{REGULAR EXPRESSIONSALGORITHMSSTRINGS}
• Count characters in your string
  ^{STRINGSFUNDAMENTALS}
• Count the smiley faces!
  ^{REGULAR EXPRESSIONSFUNDAMENTALS}
• Counting Duplicates
  ^{STRINGSFUNDAMENTALS}
• Create Phone Number
  ^{ARRAYSSTRINGSREGULAR EXPRESSIONSALGORITHMS}
• Data Reverse
  ^{ARRAYSFUNDAMENTALS}
• Decode the Morse code
  ^ALGORITHMS
• Delete occurrences of an element if it occurs more than n times
  ^{LISTSFUNDAMENTALS}
• Detect Pangram
  ^{STRINGSDATA STRUCTURESFUNDAMENTALS}
• Does my number look big in this?
  ^ALGORITHMS
• Duplicate Encoder
  ^ALGORITHMS
• Emotional Sort ( ︶︿︶)
  ^{ARRAYSFUNDAMENTALSSORTING}
• Extract the IDs from the data set
  ^{ARRAYSALGORITHMS}
• Find Cracker.
  ^{FUNDAMENTALSARRAYS}
• Find the missing letter
  ^{MATHEMATICSALGORITHMS}
• Find the odd int
  ^FUNDAMENTALS
• Find The Parity Outlier
  ^ALGORITHMS
• Find the unique number
  ^{FUNDAMENTALSALGORITHMSARRAYS}
• Good vs Evil
  ^ALGORITHMS
• Handshake problem
  ^ALGORITHMS
• Highest Scoring Word
  ^{FUNDAMENTALSSTRINGSARRAYS}
• IP Validation
  ^{REGULAR EXPRESSIONSALGORITHMS}
• Is a number prime?
  ^{MATHEMATICSALGORITHMS}
• Make the Deadfish Swim
  ^{PARSINGALGORITHMS}
• Matrix Addition
  ^{MATRIXARRAYSALGORITHMS}
• Meeting
  ^FUNDAMENTALS
• Mexican Wave
  ^{ARRAYSSTRINGSFUNDAMENTALS}
• Multiples of 3 or 5
  ^{MATHEMATICSALGORITHMS}
• Multiplication table
  ^{ARRAYSFUNDAMENTALS}
• Number Format
  ^{REGULAR EXPRESSIONSFUNDAMENTALS}
• Persistent Bugger
  ^FUNDAMENTALS
• Piano Kata, Part 1
  ^FUNDAMENTALS
• Piano Kata, Part 2
  ^FUNDAMENTALS
• Playing with digits
  ^{FUNDAMENTALSMATHEMATICS}
• Prefill an Array
  ^{ARRAYSFUNDAMENTALS}
• Replace With Alphabet Position
  ^{STRINGSFUNDAMENTALS}
• Roman Numerals Encoder
  ^ALGORITHMS
• Selective Array Reversing
  ^{ALGORITHMSLOGICARRAYS}
• Simple Fun #212: Processing Requests!
  ^FUNDAMENTALS
• Sort My Animals
  ^{LISTSSORTINGFUNDAMENTALS}
• Sort the odd
  ^{FUNDAMENTALSARRAYSSORTING}
• Split Strings
  ^{REGULAR EXPRESSIONSSTRINGSALGORITHMS}
• Stop gninnipS My sdroW!
  ^{STRINGSALGORITHMS}
• Sum of Digits / Digital Root
  ^{MATHEMATICSALGORITHMS}
• Sums of Parts
  ^{FUNDAMENTALSPERFORMANCEALGORITHMS}
• Take a Number And Sum Its Digits Raised To The Consecutive Powers And ....¡Eureka!!
  ^{FUNDAMENTALSMATHEMATICS}
• Take a Ten Minutes Walk
  ^{ARRAYSFUNDAMENTALS}
• The Deaf Rats of Hamelin
  ^{FUNDAMENTALSSTRINGSALGORITHMSQUEUES DATASTRUCTURES}
• The Office V - Find a Chair
  ^{FUNDAMENTALSARRAYSSTRINGS}
• The Supermarket Queue
  ^{ARRAYSFUNDAMENTALS}
• Title Case
  ^{STRINGSFUNDAMENTALS}
• Tombola - validation
  ^{ARRAYSFUNDAMENTALS}
• Triangle of Multiples (Easy One)
  ^{MATHEMATICSDATA STRUCTURESFUNDAMENTALS}
• Tribonacci Sequence
  ^{NUMBERTHEORY ARRAYSLISTSFUNDAMENTALS}
• Two Sum
  ^{ARRAYSFUNDAMENTALSALGORITHMS}
• Unique In Order
  ^{ALGORITHMSFUNDAMENTALS}
• Valid Braces
  ^ALGORITHMS
• Valid Parentheses
  ^ALGORITHMS
• Valid Phone Number
  ^{REGULAR EXPRESSIONSALGORITHMS}
• WeIrD StRiNg CaSe
  ^{STRINGSALGORITHMS}
• What century is it?
  ^{STRINGSALGORITHMSDATE TIME}
• Which are in?
  ^{ARRAYSLISTSSTRINGSREFACTORING}
• Who likes it?
  ^{STRINGSFUNDAMENTALS}
• Write Number in Expanded Form
  ^{STRINGSMATHEMATICSALGORITHMSFUNDAMENTALS}
• Your order, please
  ^{STRINGSFUNDAMENTALS}
• Zero-plentiful Array
  ^FUNDAMENTALS
• Ziiiiip!
  ^{ARRAYSFUNDAMENTALS}

• Alphabetical Addition
  ^ALGORITHMS
• Anagram Detection
  ^{STRINGSFUNDAMENTALS}
• Area of an arrow
  ^MATHEMATICS
• Array2Binary addition
  ^FUNDAMENTALS
• Beginner Series #3 Sum of Numbers
  ^{FUNDAMENTALSALGORITHMS}
• Binary Addition
  ^{BINARYFUNDAMENTALS}
• Complementary DNA
  ^{STRINGSFUNDAMENTALS}
• Converting 12-hour time to 24-hour time
  ^{DATE TIMEALGORITHMS}
• Count the divisors of a number
  ^{NUMBER THEORYMATHEMATICSFUNDAMENTALS}
• Credit Card Mask
  ^{STRINGSALGORITHMS}
• Descending Order
  ^FUNDAMENTALS
• Digit*Digit
  ^{MATHEMATICSFUNDAMENTALS}
• Disemvowel Trolls
  ^{STRINGSREGULAR EXPRESSIONSFUNDAMENTALS}
• Every possible sum of two digits
  ^ALGORITHMS
• Exes and Ohs
  ^FUNDAMENTALS
• Factorial
  ^FUNDAMENTALS
• Find Count of Most Frequent Item in an Array
  ^{DATA STRUCTURESFUNDAMENTALS}
• Find missing numbers
  ^{ARRAYSFUNDAMENTALS}
• Find the capitals
  ^{STRINGSARRAYSFUNDAMENTALS}
• Find the divisors!
  ^{MATHEMATICSALGORITHMS}
• Find The Duplicated Number in a Consecutive Unsorted List
  ^{ARRAYSALGORITHMS}
• Find the middle element
  ^{ARRAYSFUNDAMENTALS}
• Find the next perfect square!
  ^{ALGEBRAFUNDAMENTALS}
• Find the stray number
  ^{FUNDAMENTALSALGORITHMS}
• Fix string case
  ^FUNDAMENTALS
• Friend or Foe?
  ^FUNDAMENTALS
• Get key/value pairs as arrays
  ^{ARRAYSFUNDAMENTALS}
• Get the Middle Character
  ^{FUNDAMENTALSSTRINGS}
• Highest and Lowest
  ^{FUNDAMENTALSSTRINGS}
• Homogenous arrays
  ^{ARRAYSFUNDAMENTALSFUNCTIONAL PROGRAMMING}
• How many e-mails we sent today?
  ^{FUNDAMENTALSLOGICMATHEMATICS}
• Is n divisible by (...)?
  ^FUNDAMENTALS
• Is this a triangle
  ^{MATHEMATICSFUNDAMENTALS}
• isAN(value)
  ^FUNDAMENTALS
• isEven? - Bitwise Series
  ^{RESTRICTEDFUNDAMENTALS}
• Isograms
  ^{STRINGSFUNDAMENTALS}
• Jaden Casing Strings
  ^{STRINGSFUNDAMENTALS}
• L2: Triple X
  ^{STRINGSREGULAR EXPRESSIONSFUNDAMENTALS}
• Leap Years
  ^{DATE TIMEALGORITHMS}
• Letterbox Paint-Squad
  ^FUNDAMENTALS
• List Filtering
  ^{LISTSFILTERINGDATA STRUCTURESFUNDAMENTALS}
• Make a function that does arithmetic!
  ^FUNDAMENTALS
• Matrix creation
  ^{FUNDAMENTALSARRAYSMATRIXLINEAR ALGEBRAMATHEMATICSLANGUAGE FEATURES}
• Merge two arrays
  ^{FUNDAMENTALSARRAYS}
• Mumbling
  ^{FUNDAMENTALSSTRINGSPUZZLES}
• Naughty or Nice?
  ^{MATHEMATICSFUNDAMENTALS}
• Naughty or Nice
  ^{JSONFUNDAMENTALS}
• Number of People in the Bus
  ^FUNDAMENTALS
• Odd Not Prime
  ^ALGORITHMS
• Odd or Even?
  ^{FUNDAMENTALSARRAYS}
• Ones and Zeros
  ^{FUNDAMENTALSARRAYS}
• Only one
  ^ALGORITHMS
• Plus - minus - plus - plus - ... - Count
  ^FUNDAMENTALS
• Printer Errors
  ^FUNDAMENTALS
• Regex validate PIN code
  ^{REGULAR EXPRESSIONSFUNDAMENTALS}
• Remove anchor from URL
  ^{REGULAR EXPRESSIONSSTRINGSFUNDAMENTALS}
• Remove the minimum
  ^{LISTSARRAYSFUNDAMENTALS}
• Return the closest number multiple of 10
  ^{MATHEMATICSFUNDAMENTALS}
• Reverse words
  ^{STRINGSFUNDAMENTALS}
• Round up to the next multiple of 5
  ^FUNDAMENTALS
• Shortest Word
  ^FUNDAMENTALS
• Simple Fun #181: Rounding
  ^FUNDAMENTALS
• Small enough? - Beginner
  ^{FUNDAMENTALSARRAYS}
• Sort array by string length
  ^{SORTINGARRAYSFUNDAMENTALS}
• Sort Numbers
  ^FUNDAMENTALS
• Sorted Union
  ^{ARRAYSLISTSALGORITHMSSORTING}
• String ends with?
  ^{STRINGSFUNDAMENTALS}
• Sum of odd numbers
  ^{ARRAYSLISTSMATHEMATICSFUNDAMENTALS}
• Sum of the first nth term of Series
  ^FUNDAMENTALS
• Sum of two lowest positive integers
  ^{ARRAYSFUNDAMENTALS}
• Tail Swap
  ^FUNDAMENTALS
• Testing 1-2-3
  ^{ARRAYSFUNDAMENTALS}
• The highest profit wins!
  ^{LISTSARRAYSFUNDAMENTALS}
• The Office I - Outed
  ^{FUNDAMENTALSARRAYS}
• The Office II - Boredom Score
  ^{ARRAYSFUNDAMENTALS}
• The Office III - Broken Photocopier
  ^{FUNDAMENTALSSTRINGSARRAYS}
• The Office IV - Find a Meeting Room
  ^{FUNDAMENTALSARRAYS}
• Two to One
  ^FUNDAMENTALS
• V A P O R C O D E
  ^{STRINGSFUNDAMENTALS}
• Vowel Count
  ^{STRINGSFUNDAMENTALS}
• You're a square!
  ^{FUNDAMENTALSMATHEMATICS}

• Chuck Norris VII - True or False? (Beginner)
  ^{FUNDAMENTALSALGORITHMS}
• Compare within margin
  ^{FUNDAMENTALSLOGIC}
• Convert a string to an array
  ^{ARRAYSSTRINGSFUNDAMENTALS}
• Convert boolean values to strings 'Yes' or 'No'.
  ^FUNDAMENTALS
• Even or Odd
  ^{MATHEMATICSFUNDAMENTALS}
• Is your period late?
  ^{FUNDAMENTALSDATE TIME}
• Multiplication table for number
  ^{FUNDAMENTALSSTRINGS}
• Multiply
  ^{DEBUGGINGFUNDAMENTALS}
• Not so black box
  ^PUZZLES
• OOP: Object Oriented Piracy
  ^{OBJECT-ORIENTED PROGRAMMINGFUNDAMENTALS}
• Opposites Attract
  ^FUNDAMENTALS
• Power
  ^RESTRICTED
• Remove First and Last Character Part Two
  ^{FUNDAMENTALSARRAYSSTRINGS}
• Removing Elements
  ^{LISTSARRAYSFUNDAMENTALS}
• Return Negative
  ^FUNDAMENTALS
• Reversed Strings
  ^{STRINGSFUNDAMENTALS}
• Simple Comparison?
  ^{FUNDAMENTALSSTRINGS}