Answer & Solution
Answer: Option B
Solution:
Identifiers must start with a letter, underscore, or dollar sign.
Q
What is a valid identifier in JavaScript?
Related Questions on Average
Can JavaScript identifiers include spaces?
A). Yes
B). No
C). Only in ES6
D). Only in strings
Which of the following is an invalid identifier?
A). _variable
B). var$
C). 2variable
D). variable2
Can an identifier be a single character?
A). Yes
B). No
C). Only in ES5
D). Only in ES6
Are JavaScript identifiers case-sensitive?
A). Yes
B). No
C). Only in ES6
D). Only in strict mode
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 the following is a valid identifier name?
A). var
B). 123abc
C). _123abc
D). #abc123
What is the maximum length of an identifier?
A). 255 characters
B). 31 characters
C). 64 characters
D). No limit
Which identifier is valid in strict mode?
A). public
B). _public
C). 123public
D). public$
Which is a correct identifier for a variable?
A). 9variable
B). variable-9
C). variable_9
D). variable 9