What will happen if you declare a variable with the name undefined?

Which of the following is a valid identifier?

A). if

B). else

C). null

D). value1

What is the output of the following code: var x = 5, x = 10;

A). Syntax error

B). 5

C). 10

D). Reference error

Which of the following is an invalid identifier?

A). _variable

B). var$

C). 2variable

D). variable2

Which characters are allowed in JavaScript identifiers?

A). Letters only

B). Letters and numbers only

C). Letters, numbers, $ and _

D). Any special characters

Are JavaScript identifiers case-sensitive?

A). Yes

B). No

C). Only in ES6

D). Only in strict mode

Which of the following is a reserved word in JavaScript?

A). myVariable

B). function

C). let

D). number

What does the following code do: var $ = 5;

A). Throws an error

B). Creates a variable named $

C). Creates a variable named var

D). None of the above

Can identifiers start with a digit in JavaScript?

A). Yes

B). No

C). Only in ES5

D). Only in strict mode

What is the maximum length of an identifier?

A). 255 characters

B). 31 characters

C). 64 characters

D). No limit

What will the following code output: var x; x = 5; var y = x;

A). undefined

B). null

C). 5

D). x