Answer & Solution
Answer: Option D
Solution:
value1 is a valid identifier, while if, else, and null are reserved words.
Q
Which of the following is a valid identifier?
Related Questions on Average
Which of the following is a reserved word in JavaScript?
A). myVariable
B). function
C). let
D). number
Which is a correct identifier for a variable?
A). 9variable
B). variable-9
C). variable_9
D). variable 9
Is let a valid identifier in JavaScript?
A). Yes
B). No
C). Only in ES6
D). Only in non-strict mode
Which of the following is an invalid identifier?
A). _variable
B). var$
C). 2variable
D). variable2
Which characters are allowed in JavaScript identifiers?
A). Letters only
B). Letters and numbers only
C). Letters, numbers, $ and _
D). Any special characters
What will the following code output: var x; x = 5; var y = x;
A). undefined
B). null
C). 5
D). x
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
What is the output of the following code: var x = 5, x = 10;
A). Syntax error
B). 5
C). 10
D). Reference error
Which identifier is valid in strict mode?
A). public
B). _public
C). 123public
D). public$