var defines a variable while let defines a constant.

There is no such major difference between them

The value of variable declared with let cannot be changed

var define function scoped variable while let define block scoped variable

document. write()

console.log()

innerHTML

document.getElementById()

<!--This is a comment-->

//This is a comment

'This is a comment

#This is a comment

=

==

===

!=

jscript.write("Sky is blue")

document.write("Sky is blue")

print("Sky is blue")

jscript.print("Sky is blue")

var defines a variable while let defines a constant.

There is no such major difference between them.

The value of a variable declared with var can be changed while the value of a variable declared with let cannot be changed.

var defined function scoped variable while let define block scoped variable.

document. write()

console.log()

window. alert()

innerHTML

keyword

function

Declaration Statement

Data type

if(a!=null)

if (!a)

if(a!null)

if(a!==null)

//This is a comment

<!--This is a comment-->

/* This is a comment */

Both A and C

22

4

2

syntax error

Display()

Prompt()

Alert()

Confirm()

Volatile variable

Mutable variable

Immutable variable

Dynamic variable

var

let

const

none of the above

Displays a message in an alert box

Prints output to the console

Writes data to a file

Logs an error in the browser console

5myvalue

myvalue5

Myvalue

None of These

variable carName;

var carName;

vari carName;

dim carName;

Division by zero

Missing of semicolons

Syntax error

Both A and B

=

x

==

*

Prints an exception error

Prints an overflow error

Displays “Infinity”

Prints the value as such