JS Monkey | Modern JavaScript Engineering

JS Monkey covers modern JavaScript, framework tradeoffs, and real-world web engineering lessons.

Structured Clone vs JSON Parse Stringify for Deep Copying State

12 mins read

Best Practices

Structured Clone vs JSON Parse Stringify for Deep Copying State

April 11, 2026 Min-Ji Kim0Tagged Async Await, JavaScript Advanced, JavaScript Async, JavaScript Basics, JavaScript ES2024, JavaScript ES6, JavaScript Fetch, JavaScript Tutorial, Modern JavaScript, Promises JavaScript

Every React or Vue developer who has ever written setState(JSON.parse(JSON.stringify(prev))) has quietly shipped a bug waiting to happen.

4 Ways to Remove Duplicates From an Array in Modern JavaScript

15 mins read

Asynchronous Programming

4 Ways to Remove Duplicates From an Array in Modern JavaScript

April 6, 2026 Min-Ji Kim0Tagged Promises JavaScript

I remember debugging a massive data processing script for a Node.js backend a few years ago. We were pulling down thousands of customer records from a.