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The Mysterious Number 6174
Hard
JavaScript
numbers
math
Recursion: Isolated or Grouped?
Hard
JavaScript
recursion
arrays
Polybius Square, Bifid Cipher
Hard
JavaScript
arrays
cryptography
loops
Trifid Cipher
Hard
JavaScript
cryptography
logic
strings
Connect Four Winner
Hard
JavaScript
algorithms
games
logic
Find All Anagrams in a String
Hard
JavaScript
algorithms
logic
strings
Chain Reaction (Part #3)
Hard
JavaScript
arrays
games
Lazy Conlanging
Hard
JavaScript
strings
formatting
cryptography
Moving Particles Absorb Each Other after Collisions
Hard
JavaScript
algorithms
games
logic
The Jumping Frog
Hard
JavaScript
algorithms
arrays
conditions
A Hot Brick
Hard
JavaScript
arrays
loops
math
Area of an Array
Hard
JavaScript
algorithms
arrays
numbers
Let the Dominoes Fall Down
Hard
JavaScript
algorithms
logic
regex
MTG Mana Cost
Hard
JavaScript
strings
games
validation
Longest Valid Parentheses
Hard
JavaScript
algorithms
higher_order_functions
logic
Plant the Grass
Hard
JavaScript
algorithms
recursion
Spartans Decipher
Hard
JavaScript
algorithms
cryptography
logic
Sum of 1-N Succession
Hard
JavaScript
math
numbers
logic
Validate the Tic-Tac-Toe Game State
Hard
JavaScript
algorithms
games
strings
Recursion: Integer Division
Hard
JavaScript
recursion
numbers
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