Answer & Solution
Answer: Option B
Solution:
let is a reserved word and cannot be used as an identifier.
Q
Is let a valid identifier in JavaScript?
Related Questions on Average
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
What is the maximum length of an identifier?
A). 255 characters
B). 31 characters
C). 64 characters
D). No limit
Are JavaScript identifiers case-sensitive?
A). Yes
B). No
C). Only in ES6
D). Only in strict mode
Which is a correct identifier for a variable?
A). 9variable
B). variable-9
C). variable_9
D). variable 9
What is a valid identifier in JavaScript?
A). 123abc
B). abc123
C). let
D). var
What will the following code output: var x; x = 5; var y = x;
A). undefined
B). null
C). 5
D). x
Which of these is an invalid identifier?
A). foo_bar
B). fooBar
C). foo-bar
D). foo$bar
Which identifier is valid in strict mode?
A). public
B). _public
C). 123public
D). public$
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