JavaScript Map Coding Practice Problems Last Updated : 24 Feb, 2025 Comments Improve Suggest changes Like Article Like Report Maps are an essential data structure used for storing key-value pairs. They provide efficient lookups, insertions, and deletions, and are widely used for implementing dictionaries, caches, and many other applications. This curated list of JavaScript Map Coding Practice Problems will help you master map operations. Whether you're a beginner or an experienced developer, these problems will enhance your map manipulation skills and problem-solving abilities.Map Practice ProblemsEasyString ReversalMap OperationsParties and seatsUnique Number of OccurrencesTwice CounterFrequency GamePowerfull IntegerBalloon EverywhereSum of f(a[i], a[j]) over all pairs in an array of n integersWord with maximum frequencyDuplicate ElementsEarthquake and the Paint Shop Multimap OperationsDistinct SubstringsMaximum difference IndexesGreater and Smaller OnesPair Sum Existence- RevisitedDesign HashMapMediumLongest Subarray with Sum KSubarray with 0 sumLongest Substring with K UniquesSort Elements by Decreasing FrequencyTop k numbers in a streamFraction pairs with sum 1Transform StringSmaller on LeftCount distinct pairs with difference kCheck if a string is repetition of its substring of k-lengthMinimize the DifferenceCount Subarrays with given XORMaximize the sum of selected numbers from a sorted array to make it emptyDistinct DifferenceConcatenate Equal to Target4 Sum – Count quadruplets with given sumMaximum score from at most K jumpsSmallest distinct windowOverlapping IntervalsPrint Anagrams TogetherClosest Three SumNuts and Bolts ProblemHardPhone directoryMedian of the SubarraysInteresting QueriesAccount MergeLargest rectangular sub-matrix whose sum is 0LFU cacheSmallest window containing all characters of another stringMinimum operations to convert array A to BLRU CacheJoey doesn't share food Comment More infoAdvertise with us Next Article JavaScript Map Coding Practice Problems S souravsharma098 Follow Improve Article Tags : JavaScript Web Technologies JavaScript-DSA JavaScript-Questions JavaScript-Quiz +1 More Similar Reads JavaScript Map Reference JavaScript Map is a collection of elements where each element is stored as a key, value pair. Map objects can hold both objects and primitive values as either key or value. When we iterate over the map object it returns the key, and value pair in the same order as inserted.You can create a JavaScrip 3 min read JavaScript Map values() Method The JavaScript map.values() method is used to return a new Iterator object that contains the value of each element present in Map. The order of the values are in the same order that they were inserted into the map.Syntax:myMap.values()Parameters: This method does not accept any parameters.Example 1: 2 min read JavaScript Map get() Method The Map.get() method in JavaScript is a convenient way to retrieve the value associated with a specific key in a Map object. A Map in JavaScript allows you to store key-value pairs where keys can be of any data type, making it more useful compared to objects, which only allow strings and symbols as 3 min read Applications of Map in JavaScript Javascript Map is a collection of elements where each element is stored as a Key, value pair. Map objects can hold both objects and primitive values as either key or value. When we iterate over the map object it returns the key, and value pair in the same order as inserted. Syntax: new Map([it]); Pa 5 min read JavaScript Map set() Method The JavaScript map.set() method is used to add key-value pairs to a Map object. It can also be used to update the value of an existing key. Each value must have a unique key so that they get mapped correctly.Syntax:GFGmap.set(key, value);Parameters:This method accepts two parameters as mentioned abo 2 min read JavaScript Map Exercise In JavaScript, a Map is a built-in collection that holds key-value pairs, where keys can be of any data type, including objects, functions, or primitive types. Maps are particularly useful when you need to associate data with specific keys and ensure fast lookup times for these keys.JavaScriptlet m 1 min read Javascript Map Programming Examples A Javascript map is a collection of elements where each element is stored as a Key, value pair. Map objects can hold both objects and primitive values as either key or value. When we iterate over the map object it returns the key, and value pair in the same order as inserted.Javascript Map Programmi 3 min read Interesting Facts About Map in JavaScript JavaScript Map is used to store the data of key-value pairs. It can be used to store any type of value including objects and primitive data types. It is iterable which is the main reason we can manipulate it according to the need.Map Internally Uses Hash TableJavaSctipt Map internally uses Hashing t 4 min read JS Map Methods JavaScript Map is a built-in object that allows you to store key-value pairs. Unlike objects, Map keys can be of any data type (primitive or object), and they maintain the order of insertion. Below is a detailed overview of the most commonly used methods available with Map in JavaScript.Map Methodsn 3 min read Map in JS A Map is a data structure that stores key-value pairs, where each key is unique. It is similar to an object but has some advantages:Inserts keys in the order they were added.Allows keys of any type, not just strings and symbols.Provides better performance when dealing with large datasets.Creating a 3 min read Like