
JavaScript Closures and Truthy Values
Interactive Video
•
Computers
•
10th Grade - University
•
Practice Problem
•
Hard
Lucas Foster
FREE Resource
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10 questions
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1.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is the output when a variable declared with 'let' inside a block is accessed before initialization?
10
20
ReferenceError
Undefined
2.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
How does JavaScript handle variable declarations in terms of hoisting?
Variables are not hoisted at all
Only variable declarations are hoisted, not initializations
Variables are hoisted with their values
Both declarations and initializations are hoisted
3.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Which of the following is a truthy value in JavaScript?
[] (empty array)
undefined
null
0
4.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What will be the result of the comparison '1 == true' in JavaScript?
True
False
TypeError
Undefined
5.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
In JavaScript, what does the '===' operator compare?
Both values and types
Neither values nor types
Only values
Only types
6.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is a closure in JavaScript?
A function that remembers its lexical scope
A function that returns another function
A function that is immediately invoked
A function that has no parameters
7.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
How does a closure maintain access to its lexical environment?
By discarding the environment
By copying the environment
By creating a new environment
By referencing the environment
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