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Table Of Contents
Mastering Swift 6 - Seventh Edition
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We will start by creating a very simple closure that neither accepts any arguments nor returns any value. Its only task is to print Hello World to the console. The following code shows how to do this:
let clos1 = { () -> Void in
print("Hello World")
}
In this example, we define a closure and assign it to the clos1 constant. Since no parameters are specified within the parentheses, this closure does not accept any arguments. Additionally, its return type is Void, indicating that it does not return any value. The closure’s body consists of a single line that prints Hello World to the console.
Closures can be used in many ways; in this example, we simply want to execute it. To do so, we can call the closure like this:
clos1()
After executing the closure, Hello World will be printed to the console. While closures may not seem particularly useful at this stage, we will discover their versatility and power as we progress through...