hands-on lab

Working with JavaScript Objects

Up to 40m
Get guided in a real environmentPractice with a step-by-step scenario in a real, provisioned environment.
Learn and validateUse validations to check your solutions every step of the way.
See resultsTrack your knowledge and monitor your progress.


In this lab, you will be working with JavaScript objects. An object is a collection of properties, and a property is an association between a name and a value. Also known as key-value pairs. Object properties are unordered. Object values are accessed through the corresponding property name. Objects in JavaScript can be compared to real-world items such as cars or a user.

In this lab, you will declare an object and use both dot notation and square bracket notation to access, add, and change property values. Each check will ask you to output data to the console.

Learning Objectives

Upon completion of this lab, you will be able to:

  • Declare a JavaScript Object
  • Access the value of an object property
  • Add to and replace property values of an object

Intended Audience

  • Beginners learning front-end development
  • Software Engineers who need to learn front-end technologies to expand their skillset


The following content can ensure your success:


March 22, 2022 - The test system has been updated to allow the use of single or double quotes.

December 2nd, 2021 - Start the code environment with an empty JavaScript file

November 23rd, 2021 - Resolved an issue causing the checks to unexpectedly fail in some cases

About the author

Farish Kashefinejad, opens in a new tab
Full-Stack Development Content Creator
Learning paths

Farish has worked in the EdTech industry for over six years. He is passionate about teaching valuable coding skills to help individuals and enterprises succeed.

Previously, Farish worked at 2U Inc in two concurrent roles. Farish worked as an adjunct instructor for 2U’s full-stack boot camps at UCLA and UCR. Farish also worked as a curriculum engineer for multiple full-stack boot camp programs. As a curriculum engineer, Farish’s role was to create activities, projects, and lesson plans taught in the boot camps used by over 50 University partners. Along with these duties, Farish also created nearly 80 videos for the full-stack blended online program.

Before 2U, Farish worked at Codecademy for over four years, both as a content creator and part of the curriculum experience team.

Farish is an avid powerlifter, sushi lover, and occasional Funko collector.

Covered topics

Lab steps

Introduction to JavaScript Labs
Declare an object
Add an Object property
Replace a property value
Add a property bracket notation
Replace property array value