mpj

function reduce(arr, fn, initial) {

            //there's no more elements in the array, we return I get that
            if (arr.length === 0) {
                    return initial;
            } // base case, does not recurse

            // we are calling the actual function here with the first element in the array
            //I don't get what initial is ??

mpj

Hello there! This is a sample post for gist.io, a super-lightweight writing soapbox for hackers.

Now look up. Further. Above the post title. See that grey text with the gist ID?

Now back to me. That grey text is a link! Open that sucker in a new tab to see the source for this post. Also, I'm on a horse.

This is a major heading

If you peek at it with a web inspector, you'll see that it is a second-level heading. You can use first level headings, but they'll look just like the second level ones, and the gods of the HTML5 outlining algorithm will frown upon you.