2631. groupBy() – JavaScript Array Prototype Power!

Day 23 of 30 Days of JavaScript 💡

Today: Let’s add a custom .groupBy() to JavaScript arrays like a PRO 🧑‍💻

📌 What You’ll Learn:
✅ How to extend Array.prototype
✅ Group array elements by a condition
✅ Make data easier to summarize!

🔗 LeetCode Problem:
https://leetcode.com/problems/group-by/description

🚀 Use this trick for grouping by category, date, type, and more!

💬 What’s your favorite use case for grouping data?
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