The Front-End Web Developer Bootcamp - HTML, CSS, JS, and React - For-In Loop

The video tutorial introduces the for-in loop, explaining its syntax and purpose in iterating over object properties. It demonstrates creating an object with properties like first name, last name, and age, and how to print these properties using the for-in loop. The tutorial also covers the concept of keys in objects and how to concatenate them for display. The video concludes with a summary of how the for-in loop simplifies accessing object properties without repetitive code.

What is meant by 'key' in the context of an object in JavaScript?

Describe the process of concatenating keys and values when printing an object.