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 the temporal dead zone (TDZ) in JavaScript with let and const?

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What will the following code output?

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What happens when you reference a variable declared with const before initialization?

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What will the following code output?

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Which of the following is true about function hoisting?

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How is var hoisted differently from let and const?

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What will the following code output?

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Which method of the module pattern allows for the creation of private and public members?

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What will happen if you try to access a private variable from outside the module?

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What will the following code output?

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What is the temporal dead zone (TDZ) in JavaScript with let and const?

The area where the variable is hoisted but not accessible
The area where variables are initialized as undefined
The region where variables are hoisted and initialized
The region where only var variables are available

What will the following code output?

<p>console.log(x);<br>let x = 5;<br><br></p>

5
undefined
ReferenceError
Error

What happens when you reference a variable declared with const before initialization?

It is initialized with undefined
It throws a ReferenceError
It returns null
It logs NaN

What will the following code output?

<p>console.log(foo);<br>var foo = 10;<br>console.log(foo);<br><br></p>

undefined, 10
10, undefined
10, 10
ReferenceError

Which of the following is true about function hoisting?

Function expressions are hoisted but not initialized
Function declarations are hoisted and initialized
Both function expressions and declarations are hoisted
Functions are only hoisted in ES6

How is var hoisted differently from let and const?

var is hoisted and initialized as undefined, while let and const are hoisted without initialization
All are hoisted and initialized
var and const are hoisted and initialized; let is not
Only var is hoisted; let and const are not hoisted

What will the following code output?

<p>function hoistTest() {<br>&nbsp; console.log(x);<br>&nbsp; var x = 3;<br>}<br>hoistTest();<br><br></p>

undefined
3
null
ReferenceError

Which method of the module pattern allows for the creation of private and public members?

Using this keyword in constructors
Using closures within the module
Using class syntax
Using prototype inheritance

What will happen if you try to access a private variable from outside the module?

It will return undefined
It will throw a ReferenceError
It will return the value of the private variable
It will expose the variable globally

What will the following code output?

<p>console.log(foo);<br>var foo = function() {<br>&nbsp; return "Hello!";<br>};<br><br></p>

undefined
Hello!
ReferenceError
null