variable creation question revision

Author: arp55

src/questions/javascript-questions.md

@@ -39,7 +39,7 @@ permalink: /questions/javascript-questions/index.html
 * Explain the difference between synchronous and asynchronous functions.
 * What is event loop?
   * What is the difference between call stack and task queue?
-* What are the differences between variables created using `let`, `var` or `const`?
+* What are the differences between variables created using `let`, `var` or `const`? What is temporal dead zone?
 * What are the differences between ES6 class and ES5 function constructors?
 * Can you offer a use case for the new arrow `=>` function syntax? How does this new syntax differ from other functions?
 * What advantage is there for using the arrow syntax for a method in a constructor?