It's all Greek to me
First, we created a JavaScript script. Unity scripts are written in three languages that are somewhat like English: JavaScript, C#, and Boo. You may have already dabbled in JavaScript if you've tried your hand at web development. Unity's version of JavaScript (called "UnityScript") is a bit different because it talks about Unity-related things and runs much faster than your father's JavaScript.
In this book, we'll use JavaScript because it's the simplest of the three languages to learn. For this reason, many of the online Unity scripting tutorials you'll find are also written in JavaScript.
Tip
Stay sharp
JavaScript may be the best learning language for Unity beginners, but if you end up getting serious about developing games with this software, consider learning C#. It's much closer to a "real" programming environment, and it gives you certain organizational advantages that you won't get with JavaScript.
The first thing that we did was to write a line of code between two curly braces. I like to think of curly braces as delicious sandwich buns that group code together. The single lines of code are like the thin layers of salami or tomato in the sandwich. Above the curly braces is the description, or declaration, of the sandwich. It's like saying: We are now going to make a hoagie—top sandwich bun, yummy ingredients, bottom sandwich bun.
In more technical, less sandwich terms, the area grouped by the buns is called a statement block. The layers between the buns are called statements. And the type of sandwich we're making, the Update sandwich, is known as a function.