How to create an empty set in Swift

Overview

A set is empty if it has no element. In Swift, we can create an empty set very simply.

Syntax

setName = Set<dataType>()
Syntax for creating an Empty Set in Swift

Parameters

  • setName: This is the name of the empty set that we want to create.
  • dataType: This represents the type of data the empty element should have.

Return value

A set of a specified data type that is empty is returned.

Example

import Swift
// create empty sets
let intSet = Set<Int>()
let stringSet = Set<String>()
let boolSet = Set<Bool>()
let floatSet = Set<Float>()
// create a set that is not empty
let evenNumbers: Set<Int> = [2, 4, 6, 8, 10]
// print sets
print(intSet)
print(stringSet)
print(boolSet)
print(floatSet)
print(evenNumbers)
// check if they are empty
print(intSet.isEmpty)
print(stringSet.isEmpty)
print(boolSet.isEmpty)
print(floatSet.isEmpty)
print(evenNumbers.isEmpty)

Explanation

  • Line 4–7: We create some empty sets.
  • Line 10: We create a set that is not empty.
  • Line 13–17: We print the sets we created to the console.
  • Line 20–24: With the isEmpty method, which returns true if a set is empty, We check if the sets are empty and print the values to the console.

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