Can an identifier be a single character?
A). Yes
B). No
C). Only in ES5
D). Only in ES6
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 identifier is valid in strict mode?
A). public
B). _public
C). 123public
D). public$
Is let a valid identifier in JavaScript?
A). Yes
B). No
C). Only in ES6
D). Only in non-strict mode
Which of these is an invalid identifier?
A). foo_bar
B). fooBar
C). foo-bar
D). foo$bar
What is the output of the following code: var x = 5, x = 10;
A). Syntax error
B). 5
C). 10
D). Reference error
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
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
Which of the following is a valid identifier name?
A). var
B). 123abc
C). _123abc
D). #abc123