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
What is the primary difference between var and let?
A). Scope
B). Initialization
C). Data type
D). Assignment
Which keyword should be used for a variable that might be reassigned?
A). const
B). let
C). var
D). function
What error will the following code produce: const PI; PI = 3.14;?
A). SyntaxError
B). TypeError
C). ReferenceError
D). No error
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 const be used for objects and arrays?
A). No
B). Yes
C). Only for arrays
D). Only for objects
What will the following code output: { let y = 5; { let y = 10; console.log(y); } }?
A). 5
B). 10
C). undefined
D). ReferenceError
What is the temporal dead zone in ES6?
A). Time between function calls
B). Period between variable declaration and initialization
C). Time between two loops
D). Interval between event listeners
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