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...
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.)...
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...
Edit: I've reported this as a Chromium bug: https://bugs.chromium.org/p/chromium/issues/detail?id=668257  I'm creating a little canvas game in JS with enemies that can shoot. For testing, I created a flag, declared globally as let fancy = tru...
Recently I ran into this weird thing in chrome console. Here I am intentionally assigning an undefined thing to a in order to throw an error.  let a = werwr // Uncaught ReferenceError: werwr is not defined   Then when I tried to assign something legi...
Lately after ES6 released, many sources suggested that I use "const" and "let" instead of "var", and that I should stop using "var" in my JavaScript.  What I wonder is, if "var" has no advantage over "let&#...

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