Js Map Object. The map method calls the provided function once for each element in an array in order. First define a function that calculates the area of a circle.
But the main difference is that the Map allows keys of any type. The map object is introduced in the ES6 specification of JavaScript and it allows storing the pairs of keys and respective values in it. Map remembers the original order in which the elements were added to it which means data can be retrieved in the same order it was inserted in.
JavaScript map value to keys reverse object mapping Convert set to object - JavaScript.
But the main difference is that the Map allows keys of any type. Map reduce and filter are all array methods in JavaScript. Arrays are used for storing ordered collections. First define a function that calculates the area of a circle.
