JavaScript Set is a collection of items that are unique i.e. no element can be repeated. Elements of the set can be iterated in the insertion order. A set can store any type of value whether primitive or objects.
Syntax:
Set.function()
Example: This example will show the use of Set() constructor.
Javascript
const mySet = new Set(); Â Â mySet.add("California"); mySet.add("India"); mySet.add("California"); mySet.add(10); mySet.add(10); Â Â const myObject = { a: 1, a: 5 }; Â Â mySet.add(myObject); Â Â console.log(mySet); |
Output:
Set(4) { 'California', 'India', 10, { a: 5 } }
The complete list of JavaScript Set has listed below:
JavaScript Set Constructor: A constructor gets called when an object is created using the new keyword.
| Constructor | Description | Example |
|---|---|---|
| Set() | Create a set of unique values of any type, whether primitive values or object preferences. |
JavaScript Set Properties: Â A JavaScript property is a member of an object that associates a key with a value.
- Instance Property: An instance property is a property that has a new copy for every new instance of the class.
| Instance Properties | Description | Example |
|---|---|---|
| size | Returns the size of set | |
| constructor | Used to create a new instance of set |
JavaScript Set Methods: Methods are actions that can be performed on objects.
- Instance Method: If the method is called on an instance of a Set then it is called an instance method.
| Instance Methods | Description | Example |
|---|---|---|
| add() | Add an element to the set with the specified value | |
| clear() | Removes all the elements from the set | |
| delete() | Delete specified element if it exists in the set | |
| entries() | Used to iterate over each element of the set | |
| forEach() | Applies a function on each element of the set | |
| has() | Checks if a particular element exists in the set | |
| values() | Returns an iterator that contains all elements of the set | |
| keys() | Exactly equivalent to the values method |
