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
Can JavaScript identifiers include spaces?
A). Yes
B). No
C). Only in ES6
D). Only in strings
Is let a valid identifier in JavaScript?
A). Yes
B). No
C). Only in ES6
D). Only in non-strict mode
What is the output of the following code: var x = 5, x = 10;
A). Syntax error
B). 5
C). 10
D). Reference error
What will the following code output: var x; x = 5; var y = x;
A). undefined
B). null
C). 5
D). x
What is the maximum length of an identifier?
A). 255 characters
B). 31 characters
C). 64 characters
D). No limit
Can identifiers start with a digit in JavaScript?
A). Yes
B). No
C). Only in ES5
D). Only in strict mode
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
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