ES6 HashSet - JavaScript

ES6 HashSet is one of the new features introduced in ECMAScript 6 (ES6). It provides an efficient way to store unique values of any data type. In this introduction, we will discuss what is ES6 HashSet and how it can be used in JavaScript.

What is HashSet?

HashSet is a data structure that stores unique values. It is similar to an array, but it does not allow duplicate values. HashSet is a key-value pair data structure, where the key is the value itself. When a value is added to the HashSet, it is mapped to a unique hash code, which is used to store the value in the data structure.

When a new value is added to the HashSet, it is compared with the existing values using the hash code to determine if it is a duplicate or not. If the value is not present in the HashSet, it is added to the data structure, and if it is already present, it is ignored, and the HashSet remains unchanged.

How to use HashSet in JavaScript?

ES6 HashSet is implemented using the Set object in JavaScript. The Set object is a built-in data structure that provides methods for adding, deleting, and checking if a value exists in the HashSet. Here is an example of how to use HashSet in JavaScript:

//creating a new Set object
let mySet = new Set();

//adding values to the HashSet
mySet.add("Apple");
mySet.add("Banana");
mySet.add("Orange");

//checking if a value exists in the HashSet
console.log(mySet.has("Apple")); //true
console.log(mySet.has("Grape")); //false

//deleting a value from the HashSet
mySet.delete("Apple");

//iterating over the values in the HashSet
for (let value of mySet) {
  console.log(value);
}

//output: "Banana", "Orange"

In the above example, we created a new Set object called mySet. We added three values to the HashSet and checked if the value "Apple" exists in the HashSet using the has() method. We then deleted the value "Apple" from the HashSet using the delete() method. Finally, we iterated over the values in the HashSet using a for-of loop.

Conclusion

ES6 HashSet is a powerful data structure that can be used to store unique values of any data type. It is implemented using the Set object in JavaScript and provides methods for adding, deleting, and checking if a value exists in the HashSet. If you need to store unique values in your JavaScript program, consider using ES6 HashSet.