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Coding Challenges
Explore our collection of coding challenges and practice questions. Filter by topic, difficulty, and more to find the perfect challenges for your learning journey.
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Javascript
Sum Values of Object Properties
Easy
Numeric valuesJavascriptObjects+1
Working with Nested Objects in JavaScript
Easy
NestedJavascriptObjects
Iterating Over Object Properties in JavaScript
Medium
JavascriptObjectsIteration
Count the Vowels
Easy
JavascriptStringsLoops+1
Find the First Non-Repeating Character in a String
Medium
JavascriptStringsHash maps+1
Merging Objects in JavaScript
Easy
JavascriptObjects
Deep Cloning Objects in JavaScript
Medium
JavascriptObjectsRecursion
How to Filter and Categorize Comments by Likes Using Array Reduce in JavaScript
Medium
ArraysReduceFiltering+1
React useState: How to Correctly Update Temperature State Multiple Times
Easy
State updatesReactUsestate+1
Fix Async forEach Loop Not Waiting for Discount Calculations in JavaScript Shopping Cart
Medium
ArraysPromisesForeach+1
React useState: Why Does toggleNotifications Button Reset Theme Property in Settings Object?
Easy
ReactUsestateObjects+1
How to Detect "Click and Subscribe" Patterns in Text Using JavaScript Array Methods
Easy
ArraysSomeConditional logic+1
How to Update Form State Using Spread Operator in React onChange Handler
Easy
ReactFormsSpread operator+1
How to Create a Time Ago Formatter for Real-Time Chat Messages in JavaScript
Medium
DateTime formattingClasses+1
React: Optimizing Product Search Performance with Debounced Text Highlighting
Medium
ReactDebouncingUseeffect+2