Declaring tuples

Tuples can hold any number of values, from any number of types. You can declare a tuple with the same types—let's say a 2D point in Double:

let origin = (0.0, 0.0)

You can also name the parameters, as follows:

let point = (x: 10.0, y: 10.0)

The two forms are equivalent, but you may want to use the named version, for readability reasons. If you're referencing a size, for example, the tuple would more accordingly be named (width: Double, height: Double). For obvious reasons, this helps to provide a better understanding of your code.