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Challenges
2,421 JavaScript challenges
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Count Instances of a Character in a String
Hard
JavaScript
loops
strings
language_fundamentals
Sum of Resistance in Series Circuits
Hard
JavaScript
math
loops
physics
No Conditionals?
Hard
JavaScript
control_flow
logic
Burglary Series (20): Sign Your Name
Hard
JavaScript
objects
Number Split
Hard
JavaScript
numbers
arrays
math
Come Check Out This Crazy Function
Hard
JavaScript
bit_operations
cryptography
Filter out Strings from an Array
Hard
JavaScript
loops
arrays
formatting
Error Messages
Hard
JavaScript
strings
conditions
Incorrect Import Statement
Hard
JavaScript
strings
regex
Repeating Letters
Hard
JavaScript
strings
formatting
RegEx XV : Group Ranges - Negated Character Sets
Hard
JavaScript
regex
strings
RegEx XVII : Quantifiers - x{n}, x{n,}, x{n,}
Hard
JavaScript
regex
Burglary Series (10): Calculate Difference
Hard
JavaScript
objects
arrays
loops
Sort by String Length
Hard
JavaScript
arrays
sorting
language_fundamentals
Sum of Cubes
Hard
JavaScript
algebra
arrays
math
Highest Digit
Hard
JavaScript
numbers
language_fundamentals
Even All the Way
Hard
JavaScript
arrays
numbers
language_fundamentals
How Many Vowels?
Hard
JavaScript
regex
strings
loops
Pi to N Decimal Places
Hard
JavaScript
math
numbers
Recursion to Repeat a String n Number of Times
Hard
JavaScript
strings
recursion
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