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I like that because JavaScript runs in the browser, you can also write it in the browser and run it everywhere.

One day on the subway (cut off from the internet) I realized I wanted to see what was 'inside' document or window to see what I could use. I wrote something small on my phone like:

var s = []; for (i in document) { s.push(i) }; alert(s)

And POOF! Before my eyes I saw everything that was inside document:

I repeated the same thing for window, and realized: You can dynamically explore JavaScript with JavaScript.

That demo eventually turned into http://staticresource.com/explore.html which you can navigate by clicking on the page.

The more I write JavaScript, the more I love how simple, flexible, and ubiquitous it is. There's hardly ever a moment when I don't have either a computer or mobile device with a browser nearby, so there's hardly ever a moment I think of something to try that I don't have the ability to test it right away!