In this tutorial, we will learn how and when to use map object in JavaScript with some cool and easy examples. In many situations, you might have to come up with this type of requirements.
I know you are here just because you are in need of this awesome trick how and when to use map object in JavaScript, it can use any type of data as the key value, while an object can only use string values as keys.
Under the hood, the Map object performs better when you need to add and remove keys, so you might consider using it when your data changes frequently.
In JavaScript, the ‘Map’ object is a collection of key-value pairs where both the keys and the values can be of any type. It allows for efficient insertion, deletion, and retrieval of elements. It’s similar to objects but provides additional methods and guarantees the order of order of elements.
How to use map object in JavaScript
Certainly! Here are some examples of how you can use the ‘Map’ object in JavaScript.
1. Creating a Map and setting values:
let myMap = new Map();
myMap.set('name', 'John');
myMap.set(1, 'One');
myMap.set(true, 'Yes');
2. Getting values from a Map:
console.log(myMap.get('name'));
console.log(myMap.get(1));
console.log(myMap.get(true));
3. Checking if a key exists in a Map:
console.log(myMap.has('name'));
console.log(myMap.has('age'));
4. Deleting a key from a Map:
myMap.delete(1); console.log(myMap.get(1));
5. Iterating over a Map:
myMap.forEach((value, key) => {
console.log('${key}: ${value}');
});
Output:
name: John
true: Yes
6. Getting the size of a Map:
console.log(myMap.size);
Output: 2
In JavaScript, the Map object is utilized to store key-value pairs where keys can be of any type. It allows for efficient data retrieval and manipulation. When a Map is created, it is initialized as an empty collection. Key-value pairs can be added, accessed, or removed using appropriate methods. Unlink objects, Maps preserve the order of elements, making them suitable for scenarios where the sequence of insertion is important. Additionally, Maps offer built-in methods for iteration and manipulation, enhancing their versatility.