How to check if Set is Empty in Swift?

Swift – Check if Set is Empty

To check if a Set is empty in Swift, we can check the Set’s isEmpty property or count property.

Set.isEmpty property returns a boolean value of true if the Set is empty, or false if the Set is not empty.

Set.count property returns zero if the Set is empty, or a value greater than zero if the Set is not empty.

In this tutorial, we will go through examples covering these two ways.

In the following program, we will take an empty Set and check programmatically if the Set is empty or not, using isEmpty property of this Set.

main.swift

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var x = Set<Int>()
if x.isEmpty {
    print("Set is empty.")
} else {
    print("Set is not empty.")
}

Output

Now, let us use count property and check if Set is empty or not.

main.swift

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var x = Set<Int>()
if x.count == 0 {
    print("Set is empty.")
} else {
    print("Set is not empty.")
}

Output

Let us take a Set with some values and check if it is empty.

main.swift

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var x: Set = [1, 4, 9]
if x.isEmpty {
    print("Set is empty.")
} else {
    print("Set is not empty.")
}

Output

In this Swift Tutorial, we have learned how to check if a Set is empty or not.