Swift: count and isEmpty

count and isEmpty in Swift:

Let’s discuss count and isEmpty property in Swift.

We can use various built-in properties that help us to get information about sets or arrays in Swift!

For example, we use .count to determine the number of elements in a set:

setName.count

We learned how to use .count with arrays. .count returns an Int value representing the number of values stored in a specified set.

For example, we make a set to store the items we found in our refrigerator:

var refrigerator: Set = ["coldDrink", "Fruits", "Vegetables"];

Then we could use .count to determine how many items are in our refrigerator:

print("I have \(refrigerator.count) items in my Refrigerator!");
 
// Prints: I have 3 items in my Refrigerator!

If we want to know if our set is empty, we can use the .isEmpty property to see if it contains any values.

setName.isEmpty

• The expression returns true if no values are found in the set.
• If there are any values, the expression returns false.

Let’s check set music and place music.isEmpty in the conditional of an if statement to see if it’s empty:

var music = Set<String>();
 
if music.isEmpty {
  print("Let's download some music!");
}
// Prints: Let's download some music!

Helpful Tools:

Here are some useful tools to help you along your journey!

Setting up an IDE (Integrated Development Environment) can be difficult for beginners. The Online Compiler will enable you to run your code inside your browser without the need to install an IDE. If you need a more detailed explanation of a specific topic, the best place to find answers is in the Official Documentation.