Js Map. The JavaScript map object is a type of collection that allows storing values based on key-value pair terminology. The elements in a Map are inserted in an insertion order.
But the main difference is that Map allows keys of any type. Map object can hold both objects and primitive values as either key or value. When we iterate over the map object it returns the keyvalue pair in the same order as inserted.
Mapfilterreduce in a tweet.
The Map JavaScript Data Structure Discover the Map data structure introduced in ES6 to associate data with keys. Methods and properties are. Deletekey removes an element specified by the key. The map method creates a new array with the results of calling a function for every array element.
