hands-on lab

Working with JavaScript Arrays

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 arrays. Arrays are zero-indexed data collections with many built-in methods. These methods help you access and manipulate the values (elements) of an array.

You will declare an array and use built-in methods to access and add values to the array. Each check will ask you to output the current value of the array to the console.

Learning Objectives

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

  • Declare a JavaScript Array
  • Access the value of an array at a specific index
  • Use .push(), .length, and .splice() methods

Intended Audience

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


The following courses/courses and labs can ensure your success:

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 array
Array value at specific index
Push a value to an array
Console log the array length
Splice an array