How to implement Lodash's GroupBy Functionality From Scratch? | JavaScript Interview Questions

Published: 29 January 2022
on channel: Devtools Tech
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In this video we are going to implement Lodash's groupBy functionality from scratch. We are going to discuss how groupBy works, cover different cases, and test it against multiple inputs cases. This question tests the candidate on their thought process, how they approach the problem, handling of edge cases, and their problem solving skills.

00:00 Introduction
01:17 What are we building?
04:03 Basic Blueprint of GroupBy & Sanity Checks
06:20 Handling case where we have to groupby function output
10:51 Handling case where we have to groupby by traversing path
16:24 Handling Invalid Path Case
17:30 Running Test Cases
18:34 Lodash GroupBy vs Custom GroupBy Test Cases
19:36 Outro

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