I do not fully understand why the following displays "hoisted" towards the end.   var x = 'set'; var y = function ()  {     // WHAT YOU DON'T SEE -> var x;      // is effectively "hoisted" to this line!      if (!x)...
As I understand it, the IIFE pattern is a work around to the fact that ES5 and below do not have a way to create block scopes.  By wrapping everything in a function and immediately invoking it, we can create a scope.  Now that let and const will ga...
I know that in the new ES6 module syntax, the JavaScript engine will not have to evaluate the code to know about all the imports/exports, it will only parse it and “know” what to load.  This sounds like hoisting. Are the ES6 modules hoisted? An...
I've been learning a lot of Javascript lately and I've been trying to understand the value (if there is any) of hoisting variables.  I understand (now) that JS is a two pass system, it compiles and then executes. Also, I understand that the v...
I know that the "execution" in JavaScript happens in 2 phases:  1) The Creation phase when the functions and variables are added in the memory, hoisting,the this is create and outer environment  2) The second phases when the code is executed....
I read the concept of Javascript Hoisting.Its pretty confusing but I saw some examples and got the idea what hoisting actually does.  So basically "Hoisting is JavaScript's default behavior of moving all declarations to the top of the current...
Consider the following excerpt from ECMA-262 v5.1 (which I recently saw in this question):     A Lexical Environment is a specification type used to define the association of Identifiers to specific variables and functions based upon the lexical nest...
console.log(a) //output:ƒ a(){} var a = 1; function a(){}; var a = 10; console.log(a) //output:10   ====================  var a = 1; if(true){   function a(){};   var a = 10; } console.log(a) // this code throws Uncaught SyntaxError: Identifier '...
I was trying to understand the scope in JavaScript. If I declare a variable outside of a function, it is GLOBAL. Hence I tested the following code to understand sequence of execution. In the following code, I expected the "demo1" to take the...
I am getting a very strange output on the below scenarios:  function test(){    var test=123;    console.log(test) } // this output : 123  (function test(){    var test=123;    console.log(test) })()  // this output: 123    But when using the below c...

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