Which of the following is a reserved word in JavaScript?

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

A). Syntax error

B). Declares a variable

C). Throws a runtime error

D). Reassigns undefined

Which of the following is an invalid identifier?

A). _variable

B). var$

C). 2variable

D). variable2

Which identifier is valid in strict mode?

A). public

B). _public

C). 123public

D). public$

Can an identifier be a single character?

A). Yes

B). No

C). Only in ES5

D). Only in ES6

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 of the following is a valid identifier?

A). if

B). else

C). null

D). value1

Which of these is an invalid identifier?

A). foo_bar

B). fooBar

C). foo-bar

D). foo$bar

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

What is the maximum length of an identifier?

A). 255 characters

B). 31 characters

C). 64 characters

D). No limit

Which is a correct identifier for a variable?

A). 9variable

B). variable-9

C). variable_9

D). variable 9