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 will the following code output: { let y = 5; { let y = 10; console.log(y); } }?
A). 5
B). 10
C). undefined
D). ReferenceError
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 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 variables be reassigned in nested scopes?
A). Yes
B). No
C). Only if they are strings
D). Only in strict mode
What is the primary difference between var and let?
A). Scope
B). Initialization
C). Data type
D). Assignment
What is the scope of a variable declared with let?
A). Global
B). Function
C). Block
D). Object
Can const be used for objects and arrays?
A). No
B). Yes
C). Only for arrays
D). Only for objects
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