What is a Map? #Map #Methods & #Property Map #Example Map Iteration Map vs. Object #Conclusion #References Why hashmap? Well, we all know that another programming language has something called Hashtable. It is a data structure that stores key-value pairs that are so great because of their O(1) constant time lookup. It is an advantageous data structure we can use to store data. In JavaScript, we don't have a built-in data structure like Hashtable. But we can use an object to store key-value pairs. It is called a Map in JavaScript. What is a Map? A Map is a collection of elements where each element is stored as a Key, Value pair. A Map's keys and values can be any value (both objects and primitive values). A Map object iterates its elements in insertion order — a for...of loop returns an array of [key, value] for each iteration. A Map holds key-value pairs where the keys can be any datatype. A Map has a property that represents the size of the map. A Map remembers the original insertion order of the keys. Map Methods & Property
Map Example
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