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Challenges
2,421 JavaScript challenges
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Adding Numbers in a String
Hard
JavaScript
language_fundamentals
numbers
Return the Highest and Lowest Numbers
Hard
JavaScript
math
sorting
algorithms
Summing a Slice
Hard
JavaScript
arrays
language_fundamentals
numbers
Count Ones in a 2D Array
Hard
JavaScript
arrays
loops
RegEx: Boundary Assertions I
Hard
JavaScript
formatting
regex
validation
How Many Decimal Places?
Hard
JavaScript
numbers
strings
regex
Index Shuffle
Hard
JavaScript
strings
loops
Chat Room Status
Hard
JavaScript
arrays
control_flow
Is One Array a Subset of Another?
Hard
JavaScript
arrays
loops
validation
Regex Series: 5-Digit Zip Code
Hard
JavaScript
strings
regex
Detect Browser from User Agent
Hard
JavaScript
regex
strings
Prefixes vs. Suffixes
Hard
JavaScript
strings
regex
validation
Hiding the Card Number
Hard
JavaScript
strings
numbers
formatting
Spelling it Out
Hard
JavaScript
strings
arrays
Join Two Portions of a Path
Hard
JavaScript
strings
language_fundamentals
First and Last Index
Hard
JavaScript
language_fundamentals
arrays
Snail Race
Hard
JavaScript
arrays
games
validation
How Much is True?
Hard
JavaScript
arrays
language_fundamentals
A Redundant Function
Hard
JavaScript
language_fundamentals
functional_programming
closures
RegEx Exercise: An empty string
Hard
JavaScript
regex
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