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Challenges
2,421 JavaScript challenges
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Isomorphic Strings
Hard
JavaScript
conditions
strings
validation
Regex HTML Get Request Checker
Hard
JavaScript
regex
strings
validation
Recursion: License Plate
Hard
JavaScript
recursion
strings
regex
The Smallest Number
Hard
JavaScript
math
numbers
Centered Hexagonal Number
Hard
JavaScript
numbers
strings
formatting
Recursion: Fibonacci String
Hard
JavaScript
recursion
strings
Spiral Transposition
Hard
JavaScript
arrays
loops
math
Magic Square Check
Hard
JavaScript
arrays
validation
numbers
Vowel Skewers
Hard
JavaScript
strings
algorithms
validation
Count How Many Times an Element is Repeated
Hard
JavaScript
arrays
objects
numbers
Incrementing Rows and Columns
Hard
JavaScript
arrays
higher_order_functions
Strong Password
Hard
JavaScript
validation
strings
The Resistor Colors
Hard
JavaScript
conditions
formatting
Recursive Digit
Hard
JavaScript
recursion
math
numbers
Generate All Nonconsecutive Binary Strings
Hard
JavaScript
formatting
loops
strings
Get the Lucky Number
Hard
JavaScript
algorithms
numbers
math
Keyword Cipher
Hard
JavaScript
cryptography
logic
strings
Palindrome Descendant
Hard
JavaScript
arrays
recursion
higher_order_functions
Help Matt Get Home!
Hard
JavaScript
algorithms
loops
Image Manipulation: 255 Shades of Grey (Part 2)
Hard
JavaScript
algorithms
arrays
logic
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