JavaScript Hashing Coding Practice Problems Last Updated : 25 Feb, 2025 Comments Improve Suggest changes Like Article Like Report Hashing is a fundamental concept in JavaScript used to map data to a fixed-size value, enabling fast lookups, efficient data retrieval, and optimized storage. Hashing is commonly used in hash tables, caching, data indexing, and cryptography to store and retrieve values efficiently.This curated list of JavaScript Hashing Coding Practice Problems will help you master hashing techniques. Whether you're a beginner or an experienced developer, these problems will enhance your understanding of hash functions, collision resolution techniques, and hash-based data structures, improving your problem-solving abilities.Hashing Practice ProblemsEasyArray SubsetUncommon CharactersRepeated CharacterExceptionally OddCheck if a String is Isogram or NotFind Unique ElementCount the CharactersCount Pair SumSort the String in Descending OrderCount Number of Elements Between Two Given Elements in ArrayUnique NumbersCheck Arithmetic ProgressionString ReversalSubstrings with Same First and Last CharactersSmallest Number Repeating K TimesDemonetisationUnion of Arrays with DuplicatesCheck Equal ArraysTwo Sum - Pair with Given SumFrequencies in a Limited ArrayFirst Repeating ElementNon-Repeating CharacterIntersection of Arrays with DistinctAt Least K OccurrencesFind All Pairs with a Given SumMediumLongest Subarray with Sum KLargest Subarray with 0 SumLongest Consecutive SubsequenceFind Triplets with Zero SumTriplet Sum in ArrayStream First Non-Repeating4 Sum - All QuadruplesCount Distinct Elements in Every WindowArray Pair Sum Divisibility ProblemCheck if Frequencies Can be EqualSort According to an ArraySmallest Distinct WindowLongest Subarray with Sum Divisible by KOverlapping IntervalsPrint Anagrams TogetherHardLRU CacheSmallest Window Containing All Characters of Another StringAccount MergeLargest Rectangular Sub-Matrix Whose Sum is 0Minimum Operations to Convert Array A to BLFU Cache Comment More infoAdvertise with us Next Article JavaScript Hashing Coding Practice Problems S souravsharma098 Follow Improve Article Tags : JavaScript Web Technologies JavaScript-DSA JavaScript-Quiz Similar Reads Top 20 Hashing Technique based Interview Questions Hashing is a powerful technique in Data Structures and Algorithms (DSA) that involves mapping data to a fixed-size value using a hash function. The key advantage of hashing is its ability to provide fast lookups, often achieving constant time complexity, O(1), for operations like searching and inser 1 min read Internal Working of HashMap in Java In this article, we will understand the internal workings of the HashMap in Java, also how the get() and put() method functions, how hashing is done, how key-value pairs are stored, and how the values are retrieved by keys.Basic Structure of a HashMapHashMap contains an array of Node objects. Each n 10 min read How does HashTable Handle HashCode Distribution in Java? Key-value pairs that are mapped from keys to values using a hash function are stored in Java databases using hash tables. The distribution of hash codes, which guarantees effective element retrieval and storage, is one of a hash table's most important features. In this article, we will learn about h 3 min read IdentityHashMap hashCode() Method in Java The java.util.IdentityHashMap.hashCode() method in Java is used to fetch the hash code value of a particular this IdentityHashMap. A map consists of a number of buckets to store the key-value pair. Each bucket has a unique identity and when a key-value pair is inserted into a bucket, the key's hashc 2 min read Commonly Asked Data Structure Interview Questions on Hashing Hashing is a technique to map data to fixed-size values using a hash function, often used for quick lookups, insertions, and deletions in applications like databases and caches. The core concept behind hashing is to map large data to smaller fixed-size values, typically integers, through a hash func 4 min read Like