How to check if a set is empty in Swift

Overview

A set stores unique values or elements as a collection in Swift. An empty set has no value in it. The isEmpty method determines if a set is empty. It returns a Boolean.

Syntax

set.isEmpty
Syntax to check if a set is empty

Parameters

There are no parameters.

Return value

The returning value of isEmpty is Boolean. If the set is empty, true is returned. Otherwise, false is returned.

Example

// create some sets
let evenNumbers : Set = [2, 4, 6, 8, 10]
let oddNumbers : Set = [3, 5, 7, 9, 11]
let emptySet = Set<String>()
// check if empty
print(evenNumbers.isEmpty) // false
print(oddNumbers.isEmpty)  // false
print(emptySet.isEmpty)    // true

Explanation

  • Lines 2 and 3: We create some sets and give them some values.
  • Line 4: We create an empty set.
  • Lines 7–9: We use the isEmpty method to check if the sets we create are empty. The results are printed to the console.

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