Web Interactive Challenges

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In this course, You will learn how to elevate your web development skills with our interactive JavaScript challenges. From DOM manipulation to advanced algorithms, tackle 130+ hands-on labs designed for all levels. Perfect for aspiring developers in the US and Europe looking to build real-world coding expertise.

Exercises

Index	Name	Difficulty	Practice
001	🎯 One Plus One Equals?	Beginner	Start Challenge
002	🎯 How Many Digits Can You See?	Beginner	Start Challenge
003	🎯 Random Number Generator	Beginner	Start Challenge
004	🎯 Equal or Unequal	Beginner	Start Challenge
005	🎯 Determine Data Type Accurately	Beginner	Start Challenge
006	🎯 Reverse String Array	Beginner	Start Challenge
007	🎯 Generate an Array	Beginner	Start Challenge
008	🎯 Implement Array Deduplication in JavaScript	Beginner	Start Challenge
009	🎯 Rearrange Array Zeroes In-Place	Beginner	Start Challenge
010	🎯 Flatten an Array	Beginner	Start Challenge
011	🎯 Three-Line Love Letter	Beginner	Start Challenge
012	🎯 Palindrome String Verification in JavaScript	Beginner	Start Challenge
013	🎯 Split Array by Specified Length	Beginner	Start Challenge
014	🎯 Handle Sensitive Words	Beginner	Start Challenge
015	🎯 Who Is the Longest	Beginner	Start Challenge
016	🎯 Implement HTML Escape	Beginner	Start Challenge
017	🎯 Implement Space Replacement Function	Beginner	Start Challenge
018	🎯 Remove All Adjacent Duplicates in String	Beginner	Start Challenge
019	🎯 Ascending Array Sorting	Beginner	Start Challenge
020	🎯 Squares of a Sorted Array	Beginner	Start Challenge
021	🎯 Remove Duplicates from Sorted Array	Beginner	Start Challenge
022	🎯 Removing Elements from Array In-Place	Beginner	Start Challenge
023	🎯 Search Insert Position	Beginner	Start Challenge
024	🎯 Simple Calculator with Encapsulated Functions	Beginner	Start Challenge
025	🎯 Personal Tax Calculator Functions	Beginner	Start Challenge
026	🎯 Optimize Web Interactions with JavaScript Debounce	Beginner	Start Challenge
027	🎯 Implement the apply function	Beginner	Start Challenge
028	🎯 Implement an Increment Function	Beginner	Start Challenge
029	🎯 Implement the call function	Beginner	Start Challenge
030	🎯 Implementation of setInterval Using setTimeout	Beginner	Start Challenge
031	🎯 Implement Array Reduce in JavaScript	Beginner	Start Challenge
032	🎯 JSON Generator Tool Development	Beginner	Start Challenge
033	🎯 Check if an Object Is Empty	Beginner	Start Challenge
034	🎯 Parse URL into an Object	Beginner	Start Challenge
035	🎯 Checking If Two Objects are Equal	Beginner	Start Challenge
036	🎯 Implement Deep Cloning	Beginner	Start Challenge
037	🎯 Implement Custom Object.is Method	Beginner	Start Challenge
038	🎯 The Page Has Changed	Beginner	Start Challenge
039	🎯 Depth First Traversal of DOM Tree	Beginner	Start Challenge
040	🎯 Breadth-First Traversal of DOM Tree	Beginner	Start Challenge
041	🎯 Dynamic Tab Switching with JavaScript	Beginner	Start Challenge
042	🎯 Video Bullet Comments	Beginner	Start Challenge
043	🎯 Fibonacci Number Calculation	Beginner	Start Challenge
044	🎯 Implement Binary Search Algorithm	Beginner	Start Challenge
045	🎯 Climb Stairs with JavaScript	Beginner	Start Challenge
046	🎯 Power of Two	Beginner	Start Challenge
047	🎯 Square Root of x	Beginner	Start Challenge
048	🎯 Implement Stack Using Queues	Beginner	Start Challenge
049	🎯 Diameter of Binary Tree	Beginner	Start Challenge
050	🎯 Find kth smallest element in BST	Beginner	Start Challenge
051	🎯 Balanced Binary Tree	Beginner	Start Challenge
052	🎯 Flatten Binary Tree to Linked List	Beginner	Start Challenge
053	🎯 Complete Binary Tree Node Count	Beginner	Start Challenge
054	🎯 Average of Levels in Binary Tree	Beginner	Start Challenge
055	🎯 Binary Tree Right Side View	Beginner	Start Challenge
056	🎯 Subtree of Another Tree	Beginner	Start Challenge
057	🎯 Binary Tree Paths	Beginner	Start Challenge
058	🎯 Validate Binary Search Tree	Beginner	Start Challenge
059	🎯 Implement Root-to-Leaf Path Sum in JavaScript	Beginner	Start Challenge
060	🎯 Sum of Left Leaves	Beginner	Start Challenge
061	🎯 Minimum Depth of Binary Tree	Beginner	Start Challenge
062	🎯 Symmetric Binary Tree	Beginner	Start Challenge
063	🎯 Binary Tree Equality Check	Beginner	Start Challenge
064	🎯 Merge Binary Trees	Beginner	Start Challenge
065	🎯 Maximize Robbery Without Triggering Alarm	Beginner	Start Challenge
066	🎯 House Robber II	Beginner	Start Challenge
067	🎯 House Robber III	Beginner	Start Challenge
068	🎯 Minimum Coin Change Problem Solver	Beginner	Start Challenge
069	🎯 Coin Change II	Beginner	Start Challenge
070	🎯 Compute Distinct Paths in Grid	Beginner	Start Challenge
071	🎯 Unique Paths II	Beginner	Start Challenge
072	🎯 Subsequence Counting in Python	Beginner	Start Challenge
073	🎯 Minimum Delete Operations of Two Strings	Beginner	Start Challenge
074	🎯 Optimal Stock Buying and Selling	Beginner	Start Challenge
075	🎯 Optimal Stock Trading Timing	Beginner	Start Challenge
076	🎯 Optimal Stock Trading with Fees	Beginner	Start Challenge
077	🎯 Combine Numbers from Range	Beginner	Start Challenge
078	🎯 Combination Sum with Distinct Integers	Beginner	Start Challenge
079	🎯 Generating Subsets of Integer Arrays	Beginner	Start Challenge
080	🎯 Generating All Permutations of Distinct Integers	Beginner	Start Challenge
081	🎯 Implement Word Search in 2D Grid	Beginner	Start Challenge
082	🎯 Restore IP Addresses	Beginner	Start Challenge
083	🎯 Solve Two Sum II in Sorted Array	Beginner	Start Challenge
084	🎯 Solve Three-Sum Problem in Array	Beginner	Start Challenge
085	🎯 Minimum Size Subarray Sum	Beginner	Start Challenge
086	🎯 Finding the Werewolf	Beginner	Start Challenge
087	🎯 Secret That Cannot Be Told	Beginner	Start Challenge
088	🎯 Slot Machine Application Completion	Beginner	Start Challenge
089	🎯 Alien Message Translator Program	Beginner	Start Challenge
090	🎯 Collecting Bamboo Slip Fragments	Beginner	Start Challenge
091	🎯 Building Tall Buildings on Flat Ground	Beginner	Start Challenge
092	🎯 Division and Ranking	Beginner	Start Challenge
093	🎯 Service Years Statistics	Beginner	Start Challenge
094	🎯 Annual Star Project	Beginner	Start Challenge
095	🎯 Universal Synthesis Workbench	Beginner	Start Challenge
096	🎯 Icelandic Patronymic Name Checker	Beginner	Start Challenge
097	🎯 Little Rabbit Climbing Stairs	Beginner	Start Challenge
098	🎯 Qian Kun Mental Method	Beginner	Start Challenge
099	🎯 Ideal Stock Trading Window	Beginner	Start Challenge
100	🎯 Maximum Subarray Sum	Beginner	Start Challenge
101	🎯 Solving Large Integer Addition Challenge	Beginner	Start Challenge
102	🎯 Campus Card Issuance Form Validation	Beginner	Start Challenge
103	🎯 🆓 LabEx Campus Card	Beginner	Start Challenge
104	🎯 Fix Registration Verification Issue	Beginner	Start Challenge
105	🎯 Package Delivery Received	Beginner	Start Challenge
106	🎯 Skip You Next Time	Beginner	Start Challenge
107	🎯 Parsing and Highlighting Text Content	Beginner	Start Challenge
108	🎯 ISBN Conversion and Generation	Beginner	Start Challenge
109	🎯 Password Strength Checker	Beginner	Start Challenge
110	🎯 Simplify Unix-Style File Paths	Beginner	Start Challenge
111	🎯 Template String Parsing Implementation	Beginner	Start Challenge
112	🎯 Fitness Survey Form with HTML, CSS, JavaScript	Beginner	Start Challenge
113	🎯 Real-Time Friend Circle Publishing	Beginner	Start Challenge
114	🎯 Word Occurrences in Article	Beginner	Start Challenge
115	🎯 Personalized Recommendation System with Node.js	Beginner	Start Challenge
116	🎯 Little Rabbit Finds Carrots	Beginner	Start Challenge
117	🎯 Mall Management System	Beginner	Start Challenge
118	🎯 Image Watermark Generation	Beginner	Start Challenge
119	🎯 Super Powered Heroes League	Beginner	Start Challenge
120	🎯 Course Scheduling Wizard	Beginner	Start Challenge
121	🎯 This Is a Browser	Beginner	Start Challenge
122	🎯 Implement the New Operator	Beginner	Start Challenge
123	🎯 Locate Unique Integer in Array	Beginner	Start Challenge
124	🎯 Evaluate Reverse Polish Notation	Beginner	Start Challenge
125	🎯 Thief Retires Placeholder	Beginner	Start Challenge
126	🎯 Partition Palindrome Substrings	Beginner	Start Challenge
127	🎯 Distribute Cookies to Maximize Satisfaction	Beginner	Start Challenge
128	🎯 Maximum Value in Each Row	Beginner	Start Challenge
129	🎯 Validate Bracket String Correctness	Beginner	Start Challenge
130	🎯 Find in 2D Array	Beginner	Start Challenge

Environment

LabEx is an interactive, hands-on learning platform dedicated to coding and technology. It combines labs, AI assistance, and virtual machines to provide a no-video, practical learning experience.

• A strict "Learn by Doing" approach with exclusive hands-on labs and no videos.
• Interactive online environments within the browser, with automated step-by-step checks.
• A structured content organization with the Skill Tree based learning system.
• A growing learning resource of 30 Skill Trees and over 6,000 Labs.
• The learning assistant Labby, built on lastest AI models, providing a conversational learning experience.

Learn more about LabEx VM.

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