var let const in javascript

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YOU.com answered on November 7, 2019 Popularity 9/10 Helpfulness 1/10

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var let const in javascript

Comment

// Explanation of var, let, and const

/*
var:
- With var, variable scope is function-scoped, meaning it is accessible anywhere within the function.
- Variables declared with var can be reassigned and reassigned within their scope.
*/

var myVar = "Hello";
myVar = "World";
console.log(myVar);  // Output: World

/*
let:
- With let, variable scope is block-scoped, meaning it is only accessible within the block it is declared.
- Variables declared with let can be reassigned within their scope.
*/

let myLet = "Hello";
myLet = "World";
console.log(myLet);  // Output: World

/*
const:
- With const, variable scope is block-scoped, just like let.
- However, variables declared with const cannot be reassigned.
- Once assigned, the value of a const variable can never be changed.
*/

const myConst = "Hello";
myConst = "World";  // This will cause an error because const variables cannot be reassigned.

Popularity 9/10 Helpfulness 1/10 Language javascript

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Contributed on Sep 12 2023

YOU.com

0 Answers Avg Quality 2/10

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var let const javascript

Comment

Const vs Let vs Var

const pi = 3.14

pi = 1 
cannot do this becuase with const you cannot change the value

_____________________________________


Let --> is block level 

for(let i = 0; i < 3; i++) {
console.log(i) --> it will console here
}
console.log(i) ---> Not here


---------------------------------------

Var is for variables available to the entire function 


for(var j = 0; j < 3; j++) {
console.log(j) --> it will console here
}
console.log(j) ---> it will console here

Popularity 10/10 Helpfulness 4/10 Language javascript

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Tags: javascript j

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Contributed on Nov 07 2019

Crab Eating Fox

0 Answers Avg Quality 2/10

let var const

Comments(1)

			|						|					 |
			|       VAR             |       LET          |        CONST
SCOPE   	|	function, global    |    block scope	 |     block scope
HOISTING	|	yes					|	 no				 |	   no
REASSIGN	|	yes					|	 yes			 |	   no
RE-DECLAIR	|	yes					|	 no				 |	   no

Popularity 10/10 Helpfulness 4/10 Language css

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Contributed on Aug 19 2022

Outlander

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var let const

Comment

// Define, Update and Redefine:
// - You can define, update and redefine VAR
// - You can define and update LET but cannot redefine it
// - You can define CONST but cannot update or redefine it

// Scope:
// - LET & CONST are block scoped - anything within {} - same nesting level only
// - VAR is (so can LET & CONST be) function scoped - can be accessible within that function and cannot be used outside that function

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Contributed on Apr 12 2022

Wombat

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var const and let in javascript

Comment

Security level of Let, var and const ; Which one you have to use,,,
  var = less securty becuase it can be define another time in any scope { including function also },
  let = medium security because, let allows you to declare variables that are limited to the scope of a block statement, or expression on which it is used, unlike the var keyword, which declares a variable globally, or locally to an entire function regardless of block scope.
  const = high and ultra security because, const variables are unique in whole code

Popularity 10/10 Helpfulness 2/10 Language javascript

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Tags: javascript j

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Contributed on Sep 05 2022

Anshu Naagar

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let const var in javascript

Comment

var greeter = "hey hi";
    
    function newFunction() {
        var hello = "hello";
    }

Popularity 9/10 Helpfulness 1/10 Language javascript

Source: www.freecodecamp.org

Tags: javascript j

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Contributed on Oct 12 2022

Naman Gangrade

0 Answers Avg Quality 2/10

js var let const

Comment

let greeting = "say Hi";
   let times = 4;

   if (times > 3) {
        let hello = "say Hello instead";
        console.log(hello);// "say Hello instead"
    }
   console.log(hello) // hello is not defined

Popularity 10/10 Helpfulness 1/10 Language javascript

Source: www.freecodecamp.org

Tags: javascript j

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Contributed on Aug 24 2022

Lively Lizard

0 Answers Avg Quality 2/10

let const var in javascript

Comment

var greeter = "hey hi";
    
    function newFunction() {
        var hello = "hello";
    }

Popularity 9/10 Helpfulness 1/10 Language javascript

Source: www.freecodecamp.org

Tags: javascript j

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Contributed on Oct 12 2022

Naman Gangrade

0 Answers Avg Quality 2/10

let const var in javascript

Comment

var greeter = "hey hi";
    
    function newFunction() {
        var hello = "hello";
    }

Popularity 9/10 Helpfulness 1/10 Language javascript

Source: www.freecodecamp.org

Tags: javascript j

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Contributed on Oct 12 2022

Naman Gangrade

0 Answers Avg Quality 2/10

let const var in javascript

Comment

var greeter = "hey hi";
    
    function newFunction() {
        var hello = "hello";
    }

Popularity 9/10 Helpfulness 1/10 Language javascript

Source: www.freecodecamp.org

Tags: javascript j

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Contributed on Oct 12 2022

Naman Gangrade

0 Answers Avg Quality 2/10

var let const in javascript

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