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Challenges
2,421 JavaScript challenges
Python
JavaScript
Search
Repeated Sub-String Pattern
Hard
JavaScript
conditions
strings
validation
Reverse a Linked List
Hard
JavaScript
data_structures
recursion
higher_order_functions
Semiprimes
Hard
JavaScript
numbers
math
Split 25 (Part #2)
Hard
JavaScript
algebra
control_flow
math
Ulam Sequence
Hard
JavaScript
loops
numbers
logic
Poker Hand Ranking
Hard
JavaScript
games
data_structures
conditions
Word Search (Part 1)
Hard
JavaScript
arrays
strings
language_fundamentals
Non-Repeating Integers
Hard
JavaScript
algorithms
math
numbers
Powerful Prime Factor
Hard
JavaScript
algorithms
formatting
math
Number of Separate Regions
Hard
JavaScript
algorithms
arrays
conditions
Significant Figures
Hard
JavaScript
numbers
strings
Recursion: Multiplication by Addition
Hard
JavaScript
recursion
math
Recursion: N-Length Letter Groups
Hard
JavaScript
recursion
sorting
strings
Calculate Amounts Owing
Hard
JavaScript
data_structures
algorithms
Chain Reaction (Part #2)
Hard
JavaScript
arrays
games
Syllables of a Word
Hard
JavaScript
algorithms
regex
validation
Unravel all the Possibilities
Hard
JavaScript
logic
strings
regex
Solve for the Red Area
Hard
JavaScript
algorithms
math
numbers
Binary Sums
Hard
JavaScript
numbers
Where's the Bomb?
Hard
JavaScript
algebra
algorithms
arrays
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