JavaScript Map Exercise Last Updated : 14 Nov, 2024 Comments Improve Suggest changes Like Article Like Report 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. JavaScript let m = new Map([ ["name", "Sourav"], ["age", 23], ["job", "Engineer"] ]); console.log(m); OutputMap(3) { 'name' => 'Sourav', 'age' => 23, 'job' => 'Engineer' }Map Basic QuestionsMap vs Object in JavaScriptWhat is JavaScript Map and how to use it?Internal Working of Map in JavaScriptSet vs Map in JavaScriptSort a Map in JavaScriptMap to Array in JavaScriptCombine Values of Two Maps having Same KeyUpdate the Value for a Specific Key in MapGet Key by Value in a MapCheck if a Map is Empty in JSConvert an Array of Objects to a Map in JSCoding Problems Based on SetCount Frequency of Characters in JSMost Frequent Element in JSRelated LinksJavaScript Map ReferenceInteresting Facts About Map in JavaScriptJavascript Map Programming ExamplesJavaScript TutorialJavaScript Examples Comment More infoAdvertise with us Next Article JavaScript Map Exercise S souravsharma098 Follow Improve Article Tags : JavaScript Web Technologies javascript-map Similar Reads JavaScript Map Coding Practice Problems 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 2 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 clear() method in Java with Example The java.util.Map.clear() method in Java is used to clear and remove all of the elements or mappings from a specified Map collection. Syntax: void clear() Parameters: The method does not accept any parameters. Return Value: The method does not return any value. Below programs are used to illustrate 2 min read Map containsKey() method in Java with Examples The java.util.Map.containsKey() method is used to check whether a particular key is being mapped into the Map or not. It takes the key element as a parameter and returns True if that element is mapped in the map. Syntax: boolean containsKey(key_element) Parameters: The method takes just one paramete 2 min read Collections checkedMap() method in Java with Examples The checkedMap() method of Collections class been present inside java.util package is used to return a dynamically typesafe view of the specified map. The returned map will be serializable if the specified map is serializable. Since null is considered to be a value of any reference type, the returne 3 min read Like