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2,421 JavaScript challenges
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Count Palindrome Numbers in a Range
Hard
JavaScript
strings
control_flow
numbers
Learn Lodash: _.difference, Find the Difference in Arrays
Hard
JavaScript
arrays
Mubashir Cipher
Hard
JavaScript
algorithms
cryptography
logic
Sales by Match
Hard
JavaScript
arrays
algorithms
Sort By Index of Character
Hard
JavaScript
sorting
arrays
When Will You Save a Million?
Hard
JavaScript
loops
math
algebra
Recursion: GCD
Hard
JavaScript
recursion
math
Recursion: Right Shift by Division
Hard
JavaScript
recursion
numbers
bit_operations
Turn That Frown Upside Down
Hard
JavaScript
strings
formatting
regex
Blackjack
Hard
JavaScript
arrays
conditions
games
Trace of a Square Matrix
Hard
JavaScript
algebra
algorithms
interview
Read the Abacus (Part 1: Russian Schoty)
Hard
JavaScript
strings
arrays
loops
Birthday Cake
Hard
JavaScript
arrays
formatting
Initialize
Hard
JavaScript
arrays
formatting
Convert camelCase to snake_case
Hard
JavaScript
strings
regex
formatting
Sort a String by Its Last Character
Hard
JavaScript
strings
sorting
Logarithms - Basic
Hard
JavaScript
algebra
numbers
math
Kaprekar Numbers
Hard
JavaScript
numbers
strings
Learn Lodash: matchesProperty, Check if an Object Contains a Key Value Pair
Hard
JavaScript
objects
RegEx: Boundary Assertions VII
Hard
JavaScript
language_fundamentals
formatting
regex
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