This is a JavaScript translation of the first lesson from Wolfram Programming Lab found here: https://lab.open.wolframcloud.com/objects/wpl/GetStarted.nb
One of the nice things is that all the APIs we'll use are completely open, so if you want to dig deeper, you can actually drill in and find out how they're implemented (and even fork them!). This will be useful for the more complex examples further down like the image manipulation with filters.