New Built-in Classes: Map
Explore how to use the JavaScript Map class to store and manage key-value pairs with distinct keys. Understand creating maps, adding entries, and using methods like get, set, has, and iteration techniques such as entries, forEach, keys, and values for efficient data handling.
Using Map
Associative maps or dictionaries are significant data structures in programming. You may have used Map in Java or Dictionary in C#, for example. Suppose you want to keep track of teams and scores during the sports season.
Why were maps introduced in JavaScript?
A map will make it easy to create and update the score values and also to look up the scores based on a team’s name. It’s hard to believe that we can seriously program without maps.
Since an object in JavaScript has keys and values and there was no special Map type, programmers often used simple objects to represent maps in the past. Unfortunately, this resulted in a few problems.
- For one, there was no foolproof way to iterate over