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Why is my JavaScript hoisted local variable returning undefined but the hoisted global variable is returning blank?


Why is my JavaScript hoisted local variable returning undefined but the hoisted global variable is returning blank?

By : user2955233
Date : November 22 2020, 10:38 AM
wish helps you What is happening here is that you are accessing window.name.
This is a predefined property on window, so your hoisted var name isn't actually creating a new variable. There's already one in the global scope with that name and by default, it has a blank string value.
code :
function hoisting() {
  console.log("A: My name is " + name);   

  function happy() {
    console.log ("1: I am " + feeling);   
    var feeling = "happy";
    console.log ("2: I am " + feeling);   
  }
  happy(); 

  var name = "Jim";
  console.log("B: My name is " + name);   
}

hoisting();


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Hoisted local variable masking global variable?

Hoisted local variable masking global variable?


By : user2739435
Date : March 29 2020, 07:55 AM
seems to work fine You might take a look at using rewire
code :
var rewire = require("rewire");
var g = rewire("./lib/g");
g.__set__("Module", {name: "Module"});
Javascript: Why if statement does not evaluate the hoisted variable in function

Javascript: Why if statement does not evaluate the hoisted variable in function


By : شمووووخ العز
Date : March 29 2020, 07:55 AM
fixed the issue. Will look into that further Welcome to Javascript "Hoisting" and it's annoying ability to do thinks that do not look like are being done :)
So, what is happening it that Javascript has no block scope for if clauses and it compensated for that in a weird way. I mean, when you do
code :
function bar() {
    if (!foo) {
        var foo = 10;
    }
    alert(foo);
}
function bar() {
    var foo;
    if (!foo) {
      foo = 10;
    }
    alert(foo);
}
javascript hoisting: what would be hoisted first — variable or function?

javascript hoisting: what would be hoisted first — variable or function?


By : Amit
Date : March 29 2020, 07:55 AM
it should still fix some issue Given var foo = something, only the variable declaration is hoisted.
This means that var foo is hoisted but the foo = something will run in the reading order.
global variable gets hoisted when passing an array

global variable gets hoisted when passing an array


By : user3136029
Date : March 29 2020, 07:55 AM
I wish this help you With hoisting, only the declaration part of the statement var i = 0 (var i) gets hoisted. The i = 0 part does not. So, when your code (without list) runs and encounters:
code :
list[i]
list[0] + i
In JavaScript, when a local variable is hoisted, is it in scope even before it is declared?

In JavaScript, when a local variable is hoisted, is it in scope even before it is declared?


By : bfj
Date : March 29 2020, 07:55 AM
wish helps you Indeed, the book's conclusion is wrong. var b anywhere inside a function means b exists anywhere inside the function. That's what "hoisting" is. All var and function declarations are hoisted to the top, regardless of where they occur in the scope. The value has simply not been assigned yet.
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