javascript tutorial

JavaScript map and common practices

The JavaScript Map is a collection of keyed data items, just like an Object. But the main difference between them is that Map allows keys of any type. The JavaScript forEach method is used to execute a function on each element in an array. It is a higher-order function, meaning it takes a function as an argument and returns a new function. Map objects are simple key-value pairs, and these can be iterated in the order of insertion.