Thanks for your note, I'm not testing it under Nightly. Did you test that the 'let' declaration is working properly in JSFiddle? It may not be enabled in web pages by default if the script doesn't declare to be javascript 1.7.

From: waldron.rick at gmail.com
Date: Fri, 2 Jan 2015 14:23:31 +0000
Subject: Re: Can `let`, `static` and `yield` still be used as Identifier?
To: nbdd0121 at hotmail.com
CC: es-discuss at mozilla.org



On Thu Jan 01 2015 at 9:47:47 PM Gary Guo <nbdd0121 at hotmail.com> wrote:



It seems that in JSFiddle running on Firefox, let declaration is disabled. So this cannot explain.

I don't know why you'd say that, considering the fiddle works just fine. Open your developer console and you'll see the output. Note that I'm referring to Nightly. 
Rick 		 	   		  
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Thanks for your note, I'm not testing it under Nightly. Did you test that the 'let' declaration is working properly in JSFiddle? It may not be enabled in web pages by default if the script doesn't declare to be javascript 1.7.