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Wow Spartan (IE replacement) is really kicking some major ass with its ECMAScript 6 support:

https://kangax.github.io/compat-table/es6/

Not really. Compared to, say, Firefox' future versions, it's barely ahead, with Firefox putting some features counted multiple times behind a flag (let's remember that `let' has been available in Firefox for ages, regardless of user settings, assuming the script tag has suitable type attribute).

Further than that, it's silly to compare browsers that aren't stable yet.

Not to mention that IE is usually a bit ahead at launch, but with such a long tail (roughly two years) between releases gets pretty stale, and is in general the boat anchor that holds back being able to use said features without transpiling and/or shims for 4+ years.

I was under the impression we are going to see regular updates to Spartan similar to what we get from Chrome now.

s/IE/Mobile Safari/

I would warn against using `let` in Firefox today, their implementation has a lot of bugs[1][2] at this point.

[1] https://bugzilla.mozilla.org/show_bug.cgi?id=950547 [2] https://bugzilla.mozilla.org/show_bug.cgi?id=1023609

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