lab challenge

JavaScript for Beginners Challenge

Up to 1h
Get challenged in a real environmentProve your skills in a real-world, provisioned environment.
Push your limitsComplete an unguided mission within the time limit.
See resultsTest your problem-solving skills and track your progress.


JavaScript is one of the most popular programming languages around. Your effort invested in learning JavaScript can take your career to many places. This lab challenge will help you confirm your knowledge in topics covered in the JavaScript for Beginners Path

In this lab challenge, you will be provided with a web browser-based integrated development environment (IDE) with incomplete code for a calculator app. Each step will add features to the app and must be completed before the time runs out.  This is a real environment, which means you can prove your knowledge in an applied situation, leaving behind multiple choice questions for a dynamic performance-based exam situation.

Note: For the lab validation system to function properly, the steps and checks need to be done in order as stated by the instructions.


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


  • Completion of the JavaScript for Beginners is recommended before attempting this lab challenge
  • Introductory knowledge of JavaScript

Intended audience

  • Software Engineers
  • Front-End Engineers
  • JavaScript Developers

What will be assessed

  • JavaScript

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


Introduction to JavaScript Labs Challenge
Creating the Subtract Function
Creating an If Statement and Executing the Subtract Function
Creating the Multiply Function
Creating an Else If Statement and Executing the Multiply Function
Creating the Divide Function
Creating an Else If Statement and Executing the Divide Function
Creating An Else Statement