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

Which is a correct identifier for a variable?

A). 9variable

B). variable-9

C). variable_9

D). variable 9

Which identifier is valid in strict mode?

A). public

B). _public

C). 123public

D). public$

Which of the following is an invalid identifier?

A). _variable

B). var$

C). 2variable

D). variable2

Which of the following is a valid identifier name?

A). var

B). 123abc

C). _123abc

D). #abc123

Can identifiers start with a digit in JavaScript?

A). Yes

B). No

C). Only in ES5

D). Only in strict mode

Which of the following is a reserved word in JavaScript?

A). myVariable

B). function

C). let

D). number

What is the maximum length of an identifier?

A). 255 characters

B). 31 characters

C). 64 characters

D). No limit

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

Can JavaScript identifiers include spaces?

A). Yes

B). No

C). Only in ES6

D). Only in strings