NEW! Pre-order my latest book, Testing Swift! >>

< Previous: Functions summary   Next: Accepting parameters in a closure >

Creating basic closures

Swift lets us use functions just like any other type such as strings and integers. This means you can create a function and assign it to a variable, call that function using that variable, and even pass that function into other functions as parameters.

Functions used in this way are called closures, and although they work like functions they are written a little differently.

Let’s start with a simple example that prints a message:

let driving = {
    print("I'm driving in my car")
}

That effectively creates a function without a name, and assigns that function to driving. You can now call driving() as if it were a regular function, like this:

driving()

Swift on the server is here

Get ahead of the game and learn server-side Swift with my latest book – build real-world projects while you learn!

< Previous: Functions summary   Next: Accepting parameters in a closure >
MASTER SWIFT NOW
Buy Practical iOS 12 Buy Pro Swift Buy Swift Design Patterns Buy Practical iOS 11 Buy Swift Coding Challenges Buy Server-Side Swift (Vapor Edition) Buy Server-Side Swift (Kitura Edition) Buy Hacking with macOS Buy Advanced iOS Volume One Buy Hacking with watchOS Buy Hacking with tvOS Buy Hacking with Swift Buy Dive Into SpriteKit Buy Swift in Sixty Seconds Buy Objective-C for Swift Developers Buy Beyond Code

Was this page useful? Let me know!

Click here to visit the Hacking with Swift store >>