Javascript Map Object. A property is a key-value pair where the key must be a string and the value can be of any type. Methods and properties are.
JavaScript map method is used to call a function on each element of an array to create a different array based on the outputs of the function. Then pass the circleArea function to the map method. Mapprototypegetkey Returns the value associated to the key or undefined if there is none.
But the main difference is that Map allows keys of any type.
To make it shorter you can pass in the map method an. JavaScript map value to keys reverse object mapping. In JavaScript objects are used to store multiple values as a complex data structure. The map object is introduced in the ES6 specification of JavaScript and it allows storing the pairs of keys and respective values in it.
