JavaScript Set difference()
Syntax & Examples

Set.difference() method

The difference() method of the Set object in JavaScript takes another set as an argument and returns a new set containing elements that are present in the original set but not in the given set.

Syntax of Set.difference()

The syntax of Set.difference() method is:

difference(other)

This difference() method of Set takes a set and returns a new set containing elements in this set but not in the given set.

Parameters

ParameterOptional/RequiredDescription
otherrequiredThe set whose elements will be excluded from the original set.

Return Type

Set.difference() returns value of type Set.


✐ Examples

1 Using difference() to find the difference between two sets of numbers

In JavaScript, we can use the difference() method to find the difference between two sets of numbers.

For example,

  1. Create a new Set object setA with initial values 1, 2, and 3.
  2. Create another Set object setB with initial values 2 and 3.
  3. Use the difference() method to find the difference between setA and setB, storing the result in differenceSet.
  4. Log the differenceSet to the console using console.log().

JavaScript Program

const setA = new Set([1, 2, 3]);
const setB = new Set([2, 3]);
const differenceSet = setA.difference(setB);
console.log(differenceSet);

Output

Set { 1 }

2 Using difference() with sets of strings

In JavaScript, we can use the difference() method to find the difference between two sets of strings.

For example,

  1. Create a new Set object setA with initial values 'apple', 'banana', and 'cherry'.
  2. Create another Set object setB with initial values 'banana' and 'cherry'.
  3. Use the difference() method to find the difference between setA and setB, storing the result in differenceSet.
  4. Log the differenceSet to the console using console.log().

JavaScript Program

const setA = new Set(['apple', 'banana', 'cherry']);
const setB = new Set(['banana', 'cherry']);
const differenceSet = setA.difference(setB);
console.log(differenceSet);

Output

Set { 'apple' }

3 Using difference() to find the difference between sets of objects

In JavaScript, we can use the difference() method to find the difference between two sets of objects.

For example,

  1. Create a new Set object setA with initial objects representing different people.
  2. Create another Set object setB with some overlapping objects.
  3. Use the difference() method to find the difference between setA and setB, storing the result in differenceSet.
  4. Log the differenceSet to the console using console.log().

JavaScript Program

const person1 = { name: 'John' };
const person2 = { name: 'Jane' };
const person3 = { name: 'Doe' };
const setA = new Set([person1, person2]);
const setB = new Set([person2, person3]);
const differenceSet = setA.difference(setB);
console.log(differenceSet);

Output

Set { { name: 'John' } }

Summary

In this JavaScript tutorial, we learned about difference() method of Set: the syntax and few working examples with output and detailed explanation for each example.