javascript var hoisting

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Allan Masiga answered on December 17, 2021 Popularity 9/10 Helpfulness 1/10

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-1

export default function taskBlock(trueOrFalse) {
  var task = false;
  var task2 = true;

  if (trueOrFalse) {
    var task = true;
    var task2 = false;
  }

  return [task, task2];
}

Popularity 9/10 Helpfulness 1/10 Language javascript

Source: intranet.alxswe.com

Tags: hoisting javascript var

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Contributed on Aug 30 2023

Allan Masiga

0 Answers Avg Quality 2/10

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hoisting in js

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Within the function, we first declare the name 
variable with the var keyword. This means that 
the variable gets hoisted (memory space is set 
up during the creation phase) with the default 
value of undefined, until we actually get to the 
line where we define the variable. We haven't defined
the variable yet on the line where we try to log the 
name variable, so it still holds the value of undefined.

Variables with the let keyword (and const) are hoisted,
but unlike var, don't get initialized. They are not
accessible before the line we declare (initialize) 
them. This is called the "temporal dead zone". When we 
try to access the variables before they are declared, 
JavaScript throws a ReferenceError.

function sayHi() {
  console.log(name);
  console.log(age);
  var name = 'Lydia';
  let age = 21;
}

sayHi();

Popularity 9/10 Helpfulness 3/10 Language javascript

Source: github.com

Tags: hoisting hoistin

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Contributed on Nov 29 2023

Imran Khan

0 Answers Avg Quality 2/10

javascript hoisting

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hoistedVariable = 3;
console.log(hoistedVariable); // outputs 3 even when the variable is declared after it is initialized	
var hoistedVariable;

Popularity 10/10 Helpfulness 3/10 Language javascript

Source: www.interviewbit.com

Tags: hoisting hoistin

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Contributed on Dec 17 2021

Grotesque Gorilla

0 Answers Avg Quality 2/10

javascript hoisting

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/*
Hoisting in JavaScript is a behavior in which a function 
or a variable can be used before declaration
*/

// using test before declaring
console.log(test);   // undefined
var test;

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Source: www.programiz.com

Tags: hoisting hoistin

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Contributed on Jun 17 2022

Rasel Ahmed

0 Answers Avg Quality 2/10

javascript Variable Hoisting

Comment

// program to display value
a = 5;
console.log(a);
var a; // 5

Popularity 9/10 Helpfulness 2/10 Language javascript

Source: Grepper

Tags: hoisting hoistin

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Contributed on May 21 2022

SAMER SAEID

0 Answers Avg Quality 2/10

hoisting in javascript

Comment

// hoisting is as if your `function fun() {}` was located here. 

fun(); // works. 

function fun() {}

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Source: fireship.io

Tags: hoisting hoistin

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Contributed on Feb 01 2022

madhav

0 Answers Avg Quality 2/10

var hoisting.js

Comment

var defaultname = "John";
var name = "rayn";

function doit() {
  if(!name){
   		var name = defaultname;
  }
  return name;
}

var ourname = doit();
console.log(ourname); //John
// because name inside function will have more priority over outside name variable. 
// And, this inside name variable will be declared in memory as undefined due to hoisting.

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Source: Grepper

Tags: javascript j

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Contributed on Feb 12 2022

imtrinity94

0 Answers Avg Quality 2/10

JavaScript Hoisting

Comment

x = 5; // Assign 5 to x

elem = document.getElementById("demo"); // Find an element
elem.innerHTML = x;                     // Display x in the element

var x; // Declare x

Popularity 10/10 Helpfulness 2/10 Language javascript

Source: Grepper

Tags: hoisting hoistin

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Contributed on May 23 2022

naly moslih

0 Answers Avg Quality 2/10

javascript Hoisting

Comment

// accessing class
const p = new Person(); // ReferenceError

// defining class
class Person {
  constructor(name) {
    this.name = name;
  }
}

Popularity 10/10 Helpfulness 2/10 Language javascript

Source: Grepper

Tags: hoisting hoistin

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Contributed on May 21 2022

SAMER SAEID

0 Answers Avg Quality 2/10

variable hoisting

Comment

var a = 10;
{
    var a = -10;
}
let b = a;
{
    let b = -20;
}

console.log(b)

Popularity 9/10 Helpfulness 1/10 Language javascript

Source: www.interviewbit.com

Tags: hoisting hoistin

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Contributed on Apr 05 2022

Creepy Cod

0 Answers Avg Quality 2/10

javascript var hoisting

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