Learn JavaScript from Scratch JavaScript for Everyone - Let and Const Variable Types

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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 JavaScript?
'var' can be reassigned, 'let' cannot
'var' is function-scoped, 'let' is block-scoped
'var' is block-scoped, 'let' is function-scoped
'var' is more performant than 'let'
2.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Which of the following statements about 'const' is true?
'const' variables can be reassigned
'const' can be declared without initialization
'const' is block-scoped like 'let'
'const' is function-scoped like 'var'
3.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What happens if you try to reassign a 'const' variable?
It will reassign successfully
It will silently fail
It will throw a syntax error
It will throw a type error
4.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
In a conditional block, where can a 'let' variable be accessed?
Anywhere in the script
Anywhere in the function
Only outside the block
Only within the block
5.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Why might 'let' and 'const' be preferred over 'var'?
They are more performant due to block scoping
They are older and more reliable
They are easier to type
They allow for global access
6.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is a key benefit of using 'let' over 'var'?
'let' variables are hoisted
'let' variables are immutable
'let' variables are block-scoped
'let' variables can be redeclared
7.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Which keyword would you use for a variable that should not change?
'const'
'var'
'let'
'function'
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