Advanced Object Manipulation

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

How do you create a deep copy of a JavaScript object?

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What is the output of the following code?

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Which of the following is true about Object.freeze() in JavaScript?

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How do you make a property non-enumerable in a JavaScript object?

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Which method is used to merge two objects in JavaScript?

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What is the output of the following code?

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What does the Object.seal() method do?

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How can you check if a property is configurable in a JavaScript object?

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What is the result of the following code?

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Which method returns an array of all enumerable property names of an object?

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How do you create a deep copy of a JavaScript object?

var newObj = Object.assign({}, obj)

var newObj = { ...obj }

var newObj = JSON.parse(JSON.stringify(obj))

var newObj = obj

What is the output of the following code?

var obj = { name: "Tom" }; Object.defineProperty(obj, 'age', { value: 25 }); console.log(obj.age);

25

undefined

Error

null

Which of the following is true about Object.freeze() in JavaScript?

It prevents adding new properties to the object

It prevents modifying existing properties

It prevents deleting existing properties

All of the above

How do you make a property non-enumerable in a JavaScript object?

Object.seal(obj, property)

Object.assign(obj, {enumerable: false})

Object.defineProperty(obj, 'property', { enumerable: false })

Object.freeze(obj)

Which method is used to merge two objects in JavaScript?

Object.concat()

Object.assign()

Object.copy()

Object.combine()

What is the output of the following code?

var obj = { x: 10, y: 20 }; var newObj = Object.assign({}, obj); newObj.x = 30; console.log(obj.x);

10

20

30

undefined

What does the Object.seal() method do?

Prevents adding or removing properties but allows modifying existing ones.

Freezes the object completely

Makes all properties non-enumerable

Prevents any kind of modification to the object

How can you check if a property is configurable in a JavaScript object?

Object.isConfigurable(obj, property)

Object.isSealed(obj)

Object.getOwnPropertyDescriptor(obj, 'property').configurable

obj.hasOwnPropertyConfigurable()

What is the result of the following code?

var obj = { a: 1, b: 2 }; var desc = Object.getOwnPropertyDescriptor(obj, 'a'); console.log(desc.writable);

true

false

undefined

null

Which method returns an array of all enumerable property names of an object?

Object.getOwnPropertyNames()

Object.keys()

Object.entries()

Object.getProperties()