JavaScript Mastery from Zero to Hero - Prepare for Coding Interviews - Solution Part II - Group Objects in JavaScript

The video tutorial explains how to transform a callback function into a testing function that evaluates and filters data based on department values. It demonstrates grouping objects by values, iterating through data, and implementing a test function to filter accountants. The solution is verified by logging results and expanding the dataset, ensuring scalability for future data additions.

What is the significance of using 'object.values' versus 'object.keys'?

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Describe the logic behind the for loop used in the function.

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How does the function handle the case when no matches are found?

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