Find duplicates in array

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Accepted Answer

### 💡 How to Think About This Problem
When implementing **Find duplicates in array** in a frontend interview, candidate developers should focus on structural correctness, managing execution bindings, and minimizing performance overhead.

#### 1. Deconstructing the Requirements
To build a robust solution for **Find duplicates in array**:
* **Inputs/Outputs**: Validate parameter types, handling boundary values such as empty values, null properties, or negative constraints cleanly.
* **Design Philosophy**: Break the problem down into small, composable operations that are easy to test.

#### 2. Step-by-Step Walkthrough

* **Step-by-Step Walkthrough**:
  * **Step 1: Deduplication Key** - Normalize items using `JSON.stringify` for reference types (objects, arrays) to compare their values, not just their reference identities.
  * **Step 2: Seen Cache** - Keep a `seen` Set of stringified keys to record traversed elements.
  * **Step 3: Collision Detection** - Append elements to duplicates Set

Find duplicates in array

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Attempt it yourself

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💡 How to Think About This Problem

1. Deconstructing the Requirements

Solution ready — 2 min read

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Understand the problem

Attempt it yourself

Study the solution

💡 How to Think About This Problem

1. Deconstructing the Requirements

Solution ready — 2 min read

Run the code

Join the discussion

Discussion (0)

KEEP THESTREAK ALIVE.

KEEP THE
STREAK ALIVE.