JavaScript Set() Constructor
Last Updated :
24 Mar, 2023
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);
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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);
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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 Browser:
- Chrome 38
- Edge 12
- Firefox 13
- Opera 25
- Safari 8
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