Q. What will be the result of the following code snippet?

Code: 
let x = [1, 2, 3];
let y = x;
y.push(4);
console.log(x);
  • (A) [1, 2, 3]
  • (B) [1, 2, 3, 4]
  • (C) [4]
  • (D) Error
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✅ Correct Answer: (B) [1, 2, 3, 4]
Explanation: Arrays are reference types in JavaScript. When `y` is assigned to `x`, they both reference the same array. Modifying `y` also affects `x`, so `x` becomes `[1, 2, 3, 4]`.

Published by Mr. Dubey ⭐ 111.54K Points at 06-Jun-2025 09:29 pm in JavaScript

Explanation by: Mr. Dubey
Arrays are reference types in JavaScript. When `y` is assigned to `x`, they both reference the same array. Modifying `y` also affects `x`, so `x` becomes `[1, 2, 3, 4]`.

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