JavaScript Coding Interview Question 🔥 | Group Array Data by City
In this video, we solve a real JavaScript Interview Question:
👉 Given an array of users, group them based on the userCity property.
We will learn:
✅ Group Array of Objects
✅ Dynamic Object Keys
✅ Nullish Assignment Operator (??=)
✅ forEach Solution
✅ reduce Solution
✅ Real Interview Approach
✅ Data Transformation in JavaScript
Input:
[
{
userName: "Rahul",
userCity: "Delhi"
},
{
userName: "Amit",
userCity: "Mumbai"
}
]
Expected Output:
{
Delhi: [...],
Mumbai: [...]
}
This is a commonly asked JavaScript Interview Question and helps you understand how to work with Arrays, Objects, Dynamic Keys, and Data Manipulation.
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⏱️ Chapters
00:00 Introduction
00:45 Interview Question
02:10 Understanding the Problem
04:30 Approach Discussion
06:00 Solution using forEach
09:15 Dynamic Object Keys
11:00 Understanding ??= Operator
14:00 Transforming Objects
16:20 Solution using reduce
18:30 Interview Tips
20:00 Final Summary
--------------------------------------------
🚀 Topics Covered
JavaScript Interview Questions
Array of Objects
Group By Property
Dynamic Object Keys
Nullish Assignment Operator
JavaScript Arrays
JavaScript Objects
forEach
reduce
Frontend Interview Preparation
--------------------------------------------
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Channel: Amfybion
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