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 destructuring in JavaScript?

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Which of the following is correct syntax for array destructuring?

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What happens if you try to destructure a value that does not exist in the array?

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What is the result of this code: const [a, b] = [10, 20, 30]; console.log(a, b);?

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How can you assign default values while destructuring arrays?

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In object destructuring, which syntax is correct?

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What is the result of this code: const {a, b} = {a: 10, c: 20}; console.log(a, b);?

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Can you rename variables while destructuring objects?

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What is the output of this code: const {name: firstName} = {name: 'John'}; console.log(firstName);?

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Can destructuring be used with nested objects?

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What is destructuring in JavaScript?

Extracting elements from arrays or objects and assigning them to variables
Converting arrays into objects
Merging arrays and objects
Reversing the contents of an array

Which of the following is correct syntax for array destructuring?

let [a, b] = {x: 1, y: 2};
let [a, b] = [1, 2];
let (a, b) = [1, 2];
let {a, b} = [1, 2];

What happens if you try to destructure a value that does not exist in the array?

It throws an error
The variable is assigned as undefined
The variable is assigned null
The variable is automatically created

What is the result of this code: const [a, b] = [10, 20, 30]; console.log(a, b);?

10 30
undefined undefined
10 20
30 10

How can you assign default values while destructuring arrays?

const [a = 10, b = 20] = [];
const (a = 10, b = 20) = [];
const [a, b] = (10, 20);
const [a b] = [10, 20];

In object destructuring, which syntax is correct?

let {x, y} = {x: 1, y: 2};
let [x, y] = {x: 1, y: 2};
let {x: 1, y: 2} = {x, y};
let (x, y) = {x: 1, y: 2};

What is the result of this code: const {a, b} = {a: 10, c: 20}; console.log(a, b);?

10 undefined
undefined 20
10 20
It throws an error

Can you rename variables while destructuring objects?

No, destructuring only works with matching names
Yes, using the colon : syntax
Yes, using the equal = syntax
Yes, using the arrow => syntax

What is the output of this code: const {name: firstName} = {name: 'John'}; console.log(firstName);?

John
name
undefined
It throws an error

Can destructuring be used with nested objects?

No, destructuring only works with top-level properties
Yes, but only with arrays
Yes, by nesting the destructuring syntax
No, it throws an error