Shorthand syntax for closures

In this section, we will look at a couple of ways to shorten the syntax.

Using the shorthand syntax for closures is really a matter of personal preference. A lot of developers like to make their code as small and compact as possible, and they take great pride in doing so. However, at times this can make the code hard to read and understand for other developers.

The first shorthand syntax for closures that we are going to look at is one of the most popular, which is the syntax we saw when we were using algorithms with arrays in Chapter 5, Using Swift Collections. This format is mainly used when we want to send a really small (usually one line) closure to a function, like we did with the algorithms for arrays. Before we look at this shorthand syntax, we need to write a function that will accept a closure as a parameter:

func testFunction(num: Int, handler:() -> Void) { 
    for _ in 0..<num {
        handler()
    }
}

...