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Challenges
2,421 JavaScript challenges
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East or West
Hard
JavaScript
arrays
strings
regex
The Array Twins
Hard
JavaScript
data_structures
algorithms
arrays
Sum of an Array of Times
Hard
JavaScript
arrays
loops
algorithms
Needle in a Hex String
Hard
JavaScript
formatting
functional_programming
Average Date
Hard
JavaScript
dates
math
arrays
Dakti 🌊🌴
Hard
JavaScript
sorting
strings
arrays
Extend the Array Prototype with a `compact()` Method
Hard
JavaScript
arrays
language_fundamentals
Polydivisible Numbers
Hard
JavaScript
algebra
math
numbers
Product of Remaining Elements
Hard
JavaScript
arrays
logic
loops
Return the Sum of Two Numbers (on the Moon)
Hard
JavaScript
math
numbers
arrays
Uban Numbers
Hard
JavaScript
math
numbers
strings
Imgur URL Parser
Hard
JavaScript
regex
formatting
objects
String Expansion
Hard
JavaScript
strings
language_fundamentals
interview
RGB to Hex Color Converter
Hard
JavaScript
arrays
objects
strings
Words With Duplicate Letters
Hard
JavaScript
language_fundamentals
strings
validation
Replace Every Nth Instance of a Character
Hard
JavaScript
algorithms
strings
formatting
Format Date String
Hard
JavaScript
dates
formatting
Keeping Count
Hard
JavaScript
numbers
language_fundamentals
loops
RegEx XIX : Group Ranges - Capturing groups (x)
Hard
JavaScript
regex
formatting
Straight Digital Numbers
Hard
JavaScript
numbers
math
validation
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