JavaScript Examples

JavaScript is the most popular programming language in the world, making it a programmer's great choice. Once you learn JavaScript, it helps you develop great front-end and back-end software using different JavaScript based frameworks like ReactJS, jQuery, Node.JS, etc.

These JavaScript examples are organized by topics and arranged from easy to difficult questions. Solving questions based on these topics will help improve your JavaScript problem-solving capabilities. We recommend that you try solving each problem before checking its solution.

Table of Content

Basic Mathematics and Geometry Examples

This section deals with fundamental mathematical examples and geometric calculations. It includes problems like calculating areas, perimeters, distances, angles, and basic arithmetic examples. Examples include finding the area of different shapes, implementing geometric algorithms like point-in-polygon, and solving basic math word problems programmatically.

Array and Algorithm Examples

This focuses on manipulating one-dimensional arrays or lists. Common problems include sorting, searching, rotating arrays, finding subarray with specific properties, and implementing array-based algorithms. Questions often cover concepts like binary search, two-pointer technique, sliding window, and array transformations.

Problem	Solve	Solution
Find Closest Number in Array	Try It	View
Find the Lost Element From a Duplicated Array	Try It	View
Two Pointers Technique	Try It	View
Count Pairs with Given Sum	Try It	View
Equilibrium Index of an Array	Try It	View
Counting Frequencies of Array Elements	Try It	View
Third Largest Element in an Array of Distinct Elements	Try It	View
Find k Maximum Elements of Array in Original Order	Try It	View
Block Swap Algorithm for Array Rotation	Try It	View
Number of Local Extrema in an Array	Try It	View
Cyclically Rotate an Array by One	Try It	View
Find Common Elements in Two Sorted Arrays	Try It	View
Find k Pairs with Smallest Sums in Two Arrays	Try It	View

Matrix Examples

These questions involve 2D arrays or matrices. Topics include matrix multiplication, transposition, rotation, spiral traversal, and finding patterns in matrices. Problems often require understanding of nested loops and 2D array indexing. Matrix-based mathematical examples and transformations are common themes.

Problem	Solve	Solution
Check if a Matrix is Symmetric	Try It	View
Find Difference Between Sums of Two Diagonals	Try It	View
Check if Matrix is Upper Triangular	Try It	View
Maximum and Minimum in a Square Matrix	Try It	View
Counting Sets of 1s and 0s in a Binary Matrix	Try It	View
Diagonally Dominant Matrix	Try It	View
Mirror of Matrix Across Diagonal	Try It	View
Rotate a Matrix by 180 Degrees	Try It	View
Check if a Given Matrix is Sparse or Not	Try It	View
Efficiently Compute Sums of Diagonals of a Matrix	Try It	View
Form Coils in a Matrix	Try It	View
Frequencies of Even and Odd Numbers in a Matrix	Try It	View

Linked List Examples

This section covers examples on singly and doubly linked lists. Problems include list traversal, insertion, deletion, merging, reversing, and detecting cycles. Questions often test understanding of pointer manipulation, memory management, and implementing common linked list algorithms like finding the middle node or detecting intersections.

Problem	Solve	Solution
Inserting a Node in a Linked List	Try It	View
Searching an Element in a Linked List	Try It	View
Finding Length of a Linked List	Try It	View
Merging Two Sorted Linked Lists in Reverse Order	Try It	View
Clockwise Rotation of Linked List	Try It	View
Reversing a Linked List in Groups of Given Size	Try It	View
Swapping Nodes in a Linked List Without Swapping Data	Try It	View
Delete Nodes Which Have a Greater Value on Right Side	Try It	View

String Manipulation & Pattern Matching Examples

These problems focus on processing and analyzing text strings. Common tasks include string searching, substring examples, pattern matching, palindrome detection, and string transformations. Questions often involve regex, string algorithms like KMP or Boyer-Moore, and character manipulation.

Problem	Solve	Solution
Left Rotation and Right Rotation of a String	Try It	View
Check if Strings are Rotations of Each Other or Not	Try It	View
Check if a String Can Be Formed From Another String by at Most X Circular Clockwise Shifts	Try It	View
Check if a String Can Be Obtained by Rotating Another String by 2 Places	Try It	View
Find Lexicographically Minimum String Rotation	Try It	View
Find Longest Common Prefix Using Word by Word Matching	Try It	View

Time & Date Examples

This section deals with datetime calculations and manipulations. Problems include date arithmetic, formatting, timezone conversions, calculating time differences, and working with calendar-based algorithms. Questions often test understanding of datetime libraries and handling edge cases like leap years.

Problem	Solve	Solution
Check if a Given Year is Leap Year	Try It	View
Convert 24 Hours Format to 12 Hours	Try It	View

Browser & System Examples

These questions focus on browser APIs and system-level examples. Topics include DOM manipulation, event handling, file examples, network requests, and working with browser storage. Problems often test understanding of asynchronous programming and browser/system interfaces.

Number Theory & Counting Examples

This section covers mathematical concepts like prime numbers, factors, multiples, and combinatorics. Problems include implementing algorithms for prime factorization, finding GCD/LCM, calculating combinations/permutations, and solving number sequence problems.

Object & Array Manipulation Examples

These problems focus on working with complex data structures combining objects and arrays. Common tasks include deep cloning, merging objects, filtering/mapping nested structures, and implementing data transformations. Questions often test understanding of reference types and immutable examples.

Problem	Solve	Solution
Merge Two Objects into a Single Object and Adds the Values for Same Keys	Try It	View
Find if There is a Subarray with 0 Sum	Try It	View
The Least Frequent Element in an Array	Try It	View
The Last Duplicate Element in a Sorted Array	Try It	View
Count 1's in a Sorted Binary Array	Try It	View