Friend, if you want to learn about JavaScript Maps, you've come to one of the best and most useful tools you could possibly use. Here we want to show you how maps work in JavaScript and how you can use them. With a map in JavaScript, you can easily convert any type of data into key-value pairs.
A very useful feature of maps is that they allow you to use any type of data as a key. For example, you can use numbers, strings, and even objects as keys. This means that in real-world applications, it can be very useful.
Using maps is quite straightforward. You can create a map and then easily add data to it, use it, or even remove data from it. Also, the maps are arranged in the order of the added elements, which can be useful in some applications.
A simple example of creating a map and using it is shown below, where you can see how you can add data to it, delete, and get:
let myMap = new Map();
myMap.set('name', 'Ali');
myMap.set('age', 25);
myMap.set({location: 'Tehran'}, 'Iran');
console.log(myMap.get('name')); // Ali
myMap.delete('age');
console.log(myMap.size); // 2
What does this code do? Let's analyze it together:
let myMap = new Map(); - This line creates a new map called myMap.myMap.set('name', 'Ali'); - This line adds a key called 'name' with the value 'Ali' to the map.myMap.set('age', 25); - This line adds a key called 'age' with the value 25 to the map.myMap.set({location: 'Tehran'}, 'Iran'); - This line adds a key of type object and associates the value 'Iran' with it.console.log(myMap.get('name')); - This line prints the value of the key 'name', which is 'Ali'.myMap.delete('age'); - This line removes the key 'age' and its value from the map.console.log(myMap.size); - This line prints the size of the map, which should be 2, since we deleted one of the elements.