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Challenges
2,421 JavaScript challenges
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Find the Highest Integer in the Array Using Recursion
Hard
JavaScript
recursion
numbers
data_structures
Emphasise the Words
Hard
JavaScript
strings
loops
regex
Format Number with Comma(s) Separating Thousands
Hard
JavaScript
formatting
numbers
strings
Replace Vowel with Another Character
Hard
JavaScript
strings
regex
language_fundamentals
Harshad Number
Hard
JavaScript
math
numbers
strings
Double Letters
Hard
JavaScript
strings
regex
validation
Snail Goes Up the Stairs
Hard
JavaScript
algebra
math
numbers
War of Numbers
Hard
JavaScript
arrays
loops
numbers
Odd Up, Even Down — N Times
Hard
JavaScript
arrays
control_flow
loops
Chess Board Squares
Hard
JavaScript
algebra
algorithms
logic
Vowel Sandwich
Hard
JavaScript
strings
language_fundamentals
validation
Measure the Depth of Emptiness
Hard
JavaScript
arrays
language_fundamentals
strings
Maskify the String
Hard
JavaScript
strings
formatting
validation
ATM PIN Code Validation
Hard
JavaScript
regex
validation
Explosion Intensity
Hard
JavaScript
strings
formatting
algorithms
Return the Time Saved by Speeding
Hard
JavaScript
math
physics
Basic E-Mail Validation
Hard
JavaScript
validation
strings
logic
Online Shopping
Hard
JavaScript
objects
validation
Valid Division
Hard
JavaScript
math
validation
Find the Second Occurrence of "zip" in a String
Hard
JavaScript
loops
logic
strings
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