title: What is the double-dot operator (..) in Javascript?
body: <p>I'm doing some work with the Parser API in Spidermonkey. <a href="https://developer.mozilla.org/en/SpiderMonkey/Parser_API#Miscellaneous" rel="noreferrer">The docs</a> show that there's a binary operator <code>..</code>. Anybody have <em>any</em> idea what this is/does? I'd love to know. I've never seen it before. If I were forced to guess, I'd have to say it's something with E4X, but that's only because I know nothing about E4X.</p>