If you are like me and have ever found yourself wondering, "what is the exact syntax on how completion handlers are setup in closures?" Then this tutorial is for you. I wrote this tutorial with the idea in mind that sometimes it is nice to have a resource to reference when writing and defining completion handlers in your Swift project. I also wanted to provide a quick reference on how to setup a completion handler as a function and as declared constant. So all you have to do is make the decision about what makes the most sense in your project.