Instructions

  • 1. Your final score will reflect your grasp of the concepts—approach each question with precision.
  • 2. Thoroughly review each solution before proceeding to ensure full understanding.
  • 3. Final results will be available after submission to provide insights into areas for further improvement.
  • 4. Maintain academic integrity—plagiarism undermines learning and professional growth.
  • 5. Once submitted, responses are final, so ensure you’re confident in your answers.
  • 6. These challenges are designed to test practical knowledge; apply your skills as you would in real-world scenarios.

All Problems

Question

Action

What is a closure in JavaScript?

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Which of the following best describes how closures work?

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Why are closures useful in JavaScript?

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What will the following code output? function outer() { var count = 0; return function() { count++; console.log(count); }; } var increment = outer(); increment(); increment();

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Can closures be used to simulate private methods in JavaScript?

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Which of the following can create a closure in JavaScript?

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What will this code log? function outer() { let name = 'John'; return function() { console.log(name); }; } let inner = outer(); inner();

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In closures, which variables are accessible inside the inner function?

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Which of the following scenarios demonstrates closure behavior?

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What does a closure "close over"?

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What is a closure in JavaScript?

A function without parameters
A function within a block
A function that retains access to its lexical scope
A function that doesn't return anything

Which of the following best describes how closures work?

Functions execute and forget their environment
Functions remember the environment in which they were created
Variables inside closures are inaccessible after execution
Closures require named functions

Why are closures useful in JavaScript?

For optimizing performance
For creating private variables
For debugging purposes
For asynchronous programming

What will the following code output? function outer() { var count = 0; return function() { count++; console.log(count); }; } var increment = outer(); increment(); increment();

1, 2
2, 2
0, 1
Undefined

Can closures be used to simulate private methods in JavaScript?

Yes
No
Only in strict mode
Only in block scope

Which of the following can create a closure in JavaScript?

An arrow function
A function declaration
A function expression
All of the above

What will this code log? function outer() { let name = 'John'; return function() { console.log(name); }; } let inner = outer(); inner();

'John'
Undefined
Error
Null

In closures, which variables are accessible inside the inner function?

Variables inside the inner function only
Variables from the outer function and global scope
Global variables only
Variables defined after the closure

Which of the following scenarios demonstrates closure behavior?

A function that returns a number
A function inside a loop that retains its counter value
A function that adds two numbers
A global function

What does a closure "close over"?

Its local scope only
Its parameters
Its lexical environment
Other functions