Modern JavaScript from the Beginning - Second Edition - Block Scope

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Information Technology (IT), Architecture
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University
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Hard
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7 questions
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1.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is the main difference between 'var' and 'let' in terms of scope?
Neither 'var' nor 'let' is block-scoped
Both 'var' and 'let' are block-scoped
'let' is block-scoped, 'var' is not
'var' is block-scoped, 'let' is not
2.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What happens when you try to access a 'let' variable outside its block?
It logs the last value
It returns undefined
It throws a reference error
It returns null
3.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Which of the following is true about 'var' when used inside a block?
'var' is global-scoped
'var' is function-scoped
'var' is block-scoped
'var' is not scoped at all
4.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is the scope of a variable declared with 'const' inside a block?
Global scope
Block scope
No scope
Function scope
5.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Why is it recommended to use 'let' and 'const' over 'var'?
They are more modern
They are faster
They provide block scoping
They are easier to type
6.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is the result of accessing a 'var' variable declared inside a function from outside the function?
It returns undefined
It logs the value
It returns the value
It throws a reference error
7.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
How does a global variable declared with 'var' differ from one declared with 'let'?
Only 'let' is added to the window object
Only 'var' is added to the window object
Both are added to the window object
Neither is added to the window object
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