Answer & Solution
Answer: Option B
Solution:
The output will be 10 because the inner let y = 10 is scoped to the inner block and accessible within it.
Q
What will the following code output: { let y = 5; { let y = 10; console.log(y); } }?
Related Questions on Average
Are variables declared with let and const accessible before they are declared?
A). Yes
B). No
C). Only in strict mode
D). Only if they are numbers
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
Which keyword is used to declare a read-only named constant?
A). let
B). var
C). const
D). static
Can a const variable be declared without an initial value?
A). Yes
B). No
C). Only in strict mode
D). Only if it is an object
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
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