Set in Dart

A Set in Dart is an unordered collection of unique items. This means that each item within a set must be distinct, and there is no inherent order to how the items are stored. Sets are particularly useful when you need to ensure that a collection contains only unique elements, eliminating duplicates efficiently.

In the below PDF we discuss about Dart Sets in detail in simple language, Hope this will help in better understanding.

Dart Programming

Creating Sets:

Creating a set in Dart is straightforward. You can initialize an empty set or populate it with elements during declaration. Here’s how you can do it:

// Creating an empty set
var emptySet = <int>{};

// Creating a set with elements
var numberSet = {1, 2, 3, 4, 5};

Adding and Removing Elements:
Sets in Dart provide methods to add and remove elements. The add() method adds a single element to the set, while addAll() can be used to add multiple elements at once. Conversely, remove() and clear() methods remove elements from the set.


var colors = {'red', 'green', 'blue'};
colors.add('yellow'); // Adds 'yellow' to the set

colors.remove('green'); // Removes 'green' from the set

colors.clear(); // Clears all elements from the set

Basic Set Operations:

Dart provides several operations for working with sets, including union, intersection, difference, and subset checks. These operations allow you to combine, compare, and manipulate sets efficiently.

  • Union: Combines two sets, retaining only unique elements from both sets.
  • Intersection: Creates a new set containing only elements that are present in both sets.
  • Difference: Produces a set containing elements that are present in the first set but not in the second set.
  • Subset: Checks whether a set is a subset of another set.


var set1 = {1, 2, 3};
var set2 = {3, 4, 5};

var unionSet = set1.union(set2); // {1, 2, 3, 4, 5}
var intersectionSet = set1.intersection(set2); // {3}
var differenceSet = set1.difference(set2); // {1, 2}
var isSubset = set1.isSubsetOf(set2); // false


Sets find applications in various domains of software development. Some common scenarios where sets prove invaluable include:

  1. Removing Duplicates: Sets automatically ensure that only unique elements are stored, making them ideal for eliminating duplicate entries from a collection.
  2. Membership Checks: Sets offer efficient membership checks, allowing developers to quickly determine whether an element is present in a collection.
  3. Set Operations: Set operations facilitate tasks such as finding common elements, identifying differences, and merging datasets efficiently.


In conclusion, Sets are versatile data structures in Dart that offer unique features for managing collections of unique elements. Whether you’re working with lists, handling data processing tasks, or implementing algorithms, sets provide a powerful toolset for dealing with unique data efficiently. By understanding the syntax, operations, and practical applications of sets, Dart developers can leverage this fundamental data structure to build more robust and efficient applications.

Related Question

A Set in Dart is an unordered collection of unique elements. It does not allow duplicate elements and does not maintain the insertion order.

You can create a Set in Dart using curly braces {} and providing a list of elements separated by commas.

You can remove elements from a Set in Dart using the remove() method or removeAll() method to remove multiple elements at once.

No, the order of elements in a Set is not guaranteed. Sets in Dart are unordered collections.

Yes, you can convert a List to a Set in Dart using the toSet() method.


OOPS in Dart Object-Oriented Programming

Queue in Dart Programming A

Maps in Dart A Map

Dart Lists A Dart list

Strings in Dart A Dart

Functions in Dart In Dart,

Exception Handling in Dart Exception

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