What is the maximum length of an identifier?
A). 255 characters
B). 31 characters
C). 64 characters
D). No limit
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 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
What will the following code output: var x; x = 5; var y = x;
A). undefined
B). null
C). 5
D). x
Which of the following is a reserved word in JavaScript?
A). myVariable
B). function
C). let
D). number
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
Can JavaScript identifiers include spaces?
A). Yes
B). No
C). Only in ES6
D). Only in strings
Are JavaScript identifiers case-sensitive?
A). Yes
B). No
C). Only in ES6
D). Only in strict mode
Can identifiers start with a digit in JavaScript?
A). Yes
B). No
C). Only in ES5
D). Only in strict mode