Swift Tutorials

How to create an Empty Set in Swift

How to create an Empty Set in Swift ?

Answer

To create an empty set in Swift, you can use the Set data structure with explicit type annotation and an empty array literal.

✐ Examples

1 Create Empty Set using Set Declaration

In this example,

We declare a variable emptySet of type Set<Int> to indicate that it will hold integer values.
We initialize emptySet by assigning it an empty array literal [], which represents an empty set in Swift.
The Set type in Swift ensures uniqueness of its elements, meaning each element appears only once in the set.
We can now perform set operations such as adding elements, removing elements, and checking for membership.

Swift Program

var emptySet: Set<Int> = []

// emptySet is now ready to be used as an empty set

// Example usage:
// Add elements to the set
emptySet.insert(5)

// Remove elements from the set
emptySet.remove(5)

// Check if an element is present in the set
let containsElement = emptySet.contains(5)

print("Is element 5 present in the set: \(containsElement)")

Output

Is element 5 present in the set: false

2 Create Empty Set using Set Initialization

In this example,

We declare a variable anotherEmptySet of type Set<String> to indicate that it will hold string values.
We initialize anotherEmptySet by explicitly creating an empty set using the Set type initializer Set<String>().
This method explicitly creates an empty set of the specified type String.
We can now manipulate anotherEmptySet using set operations such as adding elements, removing elements, and checking for membership.

Swift Program

var anotherEmptySet: Set<String> = Set<String>()

// anotherEmptySet is now ready to be used as an empty set

// Example usage:
// Add elements to the set
anotherEmptySet.insert("apple")

// Remove elements from the set
anotherEmptySet.remove("apple")

// Check if an element is present in the set
let containsElement = anotherEmptySet.contains("apple")

print("Is element 'apple' present in the set: \(containsElement)")

Output

Is element 'apple' present in the set: false

Summary

In this tutorial, we learned How to create an Empty Set in Swift language with well detailed examples.

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How to create an Empty Set in Swift

How to create an Empty Set in Swift ?

Answer

✐ Examples

1 Create Empty Set using Set Declaration

Swift Program

Output

2 Create Empty Set using Set Initialization

Swift Program

Output

Summary

More Swift Sets Tutorials