Answer & Solution
Answer: Option B
Solution:
A const variable must be initialized at the time of declaration, otherwise it will cause a syntax error.
Q
Can a const variable be declared without an initial value?
Related Questions on Average
Can a variable declared with let be hoisted?
A). Yes, partially
B). No
C). Yes, fully
D). Only in strict mode
What is the value of a const variable once it is assigned?
A). Can be changed later
B). Cannot be changed later
C). Depends on the data type
D). Undefined initially
Which keyword is used to declare a read-only named constant?
A). let
B). var
C). const
D). static
What is the scope of a variable declared with let?
A). Global
B). Function
C). Block
D). Object
What is the primary difference between var and let?
A). Scope
B). Initialization
C). Data type
D). Assignment
What is the output of the following code: let z = 3; z = 5; console.log(z);?
A). 3
B). 5
C). undefined
D). ReferenceError
Can a let variable be redeclared in the same scope?
A). Yes
B). No
C). Only if it is a string
D). Only if it is a number
What error will the following code produce: const PI; PI = 3.14;?
A). SyntaxError
B). TypeError
C). ReferenceError
D). No error
What will be the output of the following code: let x = 10; { let x = 20; } console.log(x);?
A). 10
B). 20
C). undefined
D). ReferenceError
What will the following code output: { const a = 10; a = 20; }?
A). 10
B). 20
C). undefined
D). TypeError