Can JavaScript identifiers include spaces?

Which of the following is a reserved word in JavaScript?

A). myVariable

B). function

C). let

D). number

Which identifier is valid in strict mode?

A). public

B). _public

C). 123public

D). public$

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 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

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

What is a valid identifier in JavaScript?

A). 123abc

B). abc123

C). let

D). var

Which is a correct identifier for a variable?

A). 9variable

B). variable-9

C). variable_9

D). variable 9

Which of the following is a valid identifier?

A). if

B). else

C). null

D). value1

Are JavaScript identifiers case-sensitive?

A). Yes

B). No

C). Only in ES6

D). Only in strict mode