I've heard that accessing let and const values before they are initialized can cause a ReferenceError because of something called the temporal dead zone.  What is the temporal dead zone, how does it relate to scope and hoisting, and in what sit...
Regardless of functional differences, does using the new keywords 'let' and 'const' have any generalized or specific impact on performance relative to 'var'?  After running the program:  function timeit(f, N, S) {     var star...
I've attached an animated gif to illustrate this weird behavior. Essentially, my question is does Chrome console treat var and let differently when used in the same scope? You'll notice that after declaring / assigning a variable, if you try...
I have read where the 'let' keyword is working now in Firefox, and that the use of specifying the version in the script tag is no longer necessary. HOWEVER, despite adding strict mode, I am still getting the Firefox error:    I'd tried bl...
let doesnt't work in some browsers.  Not in their interpeters/ web consoles either.  Why?  (originally I thought there was an inconsistency b/t the browser interpeter and the jsFiddle, but it turns out not to be true, just bad tests on my part.)...
I want to use let expressions, but the following code doesn't work:  true ? (let x=1, let y=2, x+y) : (let x=3, let y=4, x-y); // SyntaxError   How am I supposed to do this?...
I found many topics explaining this problem, on how I can fix the following code by using var, like this one http://conceptf1.blogspot.com/2013/11/javascript-closures.html or this one JavaScript closure inside loops – simple practical example.  But...
OBSOLETE      The block version of the let statement was dropped from ES6 before it was finalized, and it has been removed from the browsers that supported it. This question is now only of historic interest.   Is there any difference between using...

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