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

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

Which of these is an invalid identifier?

A). foo_bar

B). fooBar

C). foo-bar

D). foo$bar

Can an identifier be a single character?

A). Yes

B). No

C). Only in ES5

D). Only in ES6

Which of the following is a valid identifier?

A). if

B). else

C). null

D). value1

Which characters are allowed in JavaScript identifiers?

A). Letters only

B). Letters and numbers only

C). Letters, numbers, $ and _

D). Any special characters

What will be the result of using a reserved word as an identifier?

A). No error

B). Syntax error

C). Logical error

D). Runtime error

Which identifier is valid in strict mode?

A). public

B). _public

C). 123public

D). public$

What is a valid identifier in JavaScript?

A). 123abc

B). abc123

C). let

D). var

Which of the following is a reserved word in JavaScript?

A). myVariable

B). function

C). let

D). number

Can JavaScript identifiers include spaces?

A). Yes

B). No

C). Only in ES6

D). Only in strings