JavaScript Set() Constructor (original) (raw)

Last Updated : 12 Jul, 2024

The **Javascript Set constructor is used to create Set objects. It will create a set of unique values of any type, whether primitive values or object preferences. It returns the new Set object. It mainly helps in creating a new set of objects which contains unique elements.

**Syntax:

new Set()
new Set(iterable)

**Parameters:

This method accepts a single parameter that is described below:

• **iterable: If an object is passed, all values will be added to the new set. If the parameter is not specified then the new set is empty.

**Return Value:

• This method returns a new Set object.

**Example 1: In this example, we will see how to create a new Set object.

JavaScript `

const mySet = new Set();

mySet.add("California"); mySet.add("India"); mySet.add("Russia"); mySet.add(10);

const myObject = { a: 1, b: 8 };

mySet.add(myObject);

console.log(mySet);

`

**Output:

Set(5) { 'California', 'India', 'Russia', 10, { a: 1, b: 8 } }

**Example 2: In this example, we will see that set takes only a unique value.

JavaScript `

const mySet = new Set();

mySet.add("California"); mySet.add("India"); mySet.add("California"); mySet.add(10); mySet.add(10);

const myObject = { a: 1, a: 5 };

mySet.add(myObject);

console.log(mySet);

`

**Output:

Set(4) { 'California', 'India', 10, { a: 5 } }

In this example, we have added two times "California" and 10 but it creates a set with unique values.

We have a complete list of Javascript Set methods, to check those please go through this Sets in JavaScript article.

**Supported Browsers:

• Chrome
• Edge
• Firefox
• Opera
• Safari