difference between var and let in javascript

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Next Technology answered on May 22, 2020 Popularity 9/10 Helpfulness 3/10

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Comment

Function scope is within the function.
Block scope is within curly brackets.

var character4 = 
function foo() {
    if(true) {
        var character1 = "Robin"      //function scope
        let character2 = "Ted"        //block scope
        const character3 = "Barney"   //block scope
    }
    console.log(character1)  //Robin
    console.log(character2)  //not defined
    console.log(character3). //not defined
}

Popularity 9/10 Helpfulness 3/10 Language javascript

Source: blog.coolhead.in

Tags: between difference javascript let var

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Contributed on Feb 15 2024

Next Technology

0 Answers Avg Quality 2/10

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difference between let and var in javascript

Comment

//let
1. It's used in block-scoped.
2. It does not allow to redeclare variables.	
3. Hoisting does not occur in let.
// var 
1. It's used in function scoped.
2. It allows to redeclare variables.
3. Hoisting occurs in var.

Popularity 10/10 Helpfulness 4/10 Language javascript

Source: www.programiz.com

Tags: between

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Contributed on Jun 14 2022

Rasel Ahmed

0 Answers Avg Quality 2/10

difference between var and let

Comment

var is function scoped and let is block scoped. Let's say you have:
function understanding_var() {
	if (1 == 1) {
    	var x = 5;
        console.log('the value of x inside the if statement is ' + x);
    }
    console.log(x);
} 
//output: the value of x inside the if statement is 5
		  5

function understanding_let() {
	if (1 == 1) {
    	let x = 5;
        console.log('the value of x inside the if statement is ' + x);
    }
    console.log(x);
} 
//output: the value of x inside the if statement is 5
		  Uncaught ReferenceError: x is not defined
          
var is defined throughout the entire function, even if it's inside the if 
statement, but the scope of let is always within the curly braces, not outside
it, even if the conditional statement is inside the function.

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Source: Grepper

Tags: between

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Contributed on Nov 27 2020

Important Ibex

0 Answers Avg Quality 2/10

var vs let js

Comment

let: //only available inside the scope it's declared, like in "for" loop, 
var: //accessed outside the loop "for"

Popularity 10/10 Helpfulness 4/10 Language javascript

Source: Grepper

Tags: javascript j

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Contributed on May 22 2020

Tomas Maillo

0 Answers Avg Quality 2/10

let and var difference

Comment

function run() {
  var foo = "Foo";
  let bar = "Bar";

  console.log(foo, bar);

  {
    let baz = "Bazz";
    console.log(baz);
  }

  console.log(baz); // ReferenceError
}

run();

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Source: stackoverflow.com

Tags: difference d

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Contributed on Aug 20 2020

Plain Petrel

0 Answers Avg Quality 2/10

js var vs let

Comment

let = 10 // accessable only in defined scope
var = 10 // accessable in the function it is declared in (global variable in a function)

Popularity 10/10 Helpfulness 2/10 Language javascript

Source: Grepper

Tags: javascript j

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Contributed on Apr 15 2022

katanton reckless

0 Answers Avg Quality 2/10

what to use let vs var js

Comment

/* DIFFERENCE BETWEEN LET AND VAR */

//LET EXAMPLE
{
  let a = 123;
};

console.log(a); // undefined

//VAR EXAMPLE
{
  var a = 123;
};

console.log(a); // 123

Popularity 10/10 Helpfulness 2/10 Language javascript

Source: Grepper

Tags: javascript j

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Contributed on Jun 15 2021

Excited Eel

0 Answers Avg Quality 2/10

difference between "let" and "var"?

Comment

In simple words 'var' is function scoped and 'let' is block scoped

Popularity 10/10 Helpfulness 2/10 Language javascript

Source: Grepper

Tags: between

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Contributed on Oct 02 2021

jub0t

0 Answers Avg Quality 2/10

var vs let javascript

Comment

var makes a grobal variable
let makes a local variable

Popularity 10/10 Helpfulness 1/10 Language javascript

Source: Grepper

Tags: javascript j

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Contributed on Oct 02 2022

oximas

0 Answers Avg Quality 2/10

difference between var and let in javascript

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