Loading lesson path

Learn/JavaScript/Working with Data

JavaScript•Working with Data

JavaScript Set Reference

Concept visual

JavaScript Set Reference

Pointer walk

two pointers

left=0

right=6

1

3

Start at both ends

Complete Set Reference

Revised July 2025

Method

Description new Set()

Creates a new set add()

Adds a new element to a set clear()

Removes all elements from a set delete()

Removes an element from a set difference()

Returns the difference between two sets entries()

Returns an Iterator with the [value,value] pairs from a set forEach() Invokes a callback for each element in a set has()

Returns true if a value exists intersection()

Returns the intersection of two sets isDisjointFrom()

Returns true if no elements in a set are elements in another set isSubsetOf() Returns true if a set is a subset of another set isSupersetOf() Returns true if a set is a superset of another set keys()

Same as values()

symmetricDifference() Returns the symmetric difference between two set union()

Returns the union of two sets values()

Returns an Iterator with the values in a set

Sets have only one property:

Property

Description size

Returns the number of elements in a Set

Learn More:

JavaScript Sets

JavaScript Set Methods

JavaScript Set Logic

JavaScript Weak Sets

JavaScript Maps

Loading lesson path

Learn/JavaScript/Working with Data

JavaScript•Working with Data

JavaScript Set Reference

Concept visual

JavaScript Set Reference

Pointer walk

two pointers

left=0

right=6

1

3

Start at both ends

Complete Set Reference

Revised July 2025

Method

Description new Set()

Creates a new set add()

Adds a new element to a set clear()

Removes all elements from a set delete()

Removes an element from a set difference()

Returns the difference between two sets entries()

Returns an Iterator with the [value,value] pairs from a set forEach() Invokes a callback for each element in a set has()

Returns true if a value exists intersection()

Returns the intersection of two sets isDisjointFrom()

Returns true if no elements in a set are elements in another set isSubsetOf() Returns true if a set is a subset of another set isSupersetOf() Returns true if a set is a superset of another set keys()