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2,421 JavaScript challenges
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Preventing the Collapse of the Universe
Hard
JavaScript
math
numbers
validation
First N Vowels
Hard
JavaScript
strings
regex
loops
Extend the Vowels
Hard
JavaScript
strings
regex
Check If objOne Is Equal to objTwo
Hard
JavaScript
objects
validation
language_fundamentals
Check if a Number is Prime
Hard
JavaScript
math
validation
Abbreviating a Sentence
Hard
JavaScript
strings
formatting
Percentage Changed
Hard
JavaScript
math
Functioninator 8000
Hard
JavaScript
formatting
strings
Word Nests
Hard
JavaScript
language_fundamentals
strings
Count the Towers
Hard
JavaScript
arrays
strings
Ping Pong!
Hard
JavaScript
games
arrays
algorithms
First Before Second Letter
Hard
JavaScript
strings
validation
Harshad Numbers
Hard
JavaScript
numbers
math
strings
Simple Circle Collision Detection
Hard
JavaScript
games
algebra
algorithms
Perfect Square Patch
Hard
JavaScript
arrays
loops
language_fundamentals
Numbered Cards
Hard
JavaScript
arrays
numbers
games
An Introduction to the Map-Reduce Pattern
Hard
JavaScript
functional_programming
higher_order_functions
math
Reformatting the Date
Hard
JavaScript
strings
regex
dates
Compounding Letters
Hard
JavaScript
strings
formatting
loops
Slidey Numbers
Hard
JavaScript
numbers
validation
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