Welcome to the Treehouse Community

The Treehouse Community is a meeting place for developers, designers, and programmers of all backgrounds and skill levels to get support. Collaborate here on code errors or bugs that you need feedback on, or asking for an extra set of eyes on your latest project. Join thousands of Treehouse students and alumni in the community today. (Note: Only Treehouse students can comment or ask questions, but non-students are welcome to browse our conversations.)

Looking to learn something new?

Treehouse offers a seven day free trial for new students. Get access to thousands of hours of content and a supportive community. Start your free trial today.

JavaScript JavaScript Loops, Arrays and Objects Simplify Repetitive Tasks with Loops What are Loops?

re ESLint error document.write(randNum + ' ');

The script in the lesson worked when I duplicated it on the Brackets editor on my os, However, why do I get an error in Brackets from JSLint that 'document' is not defined. [ document.write(randNum + ' '); ]

There are also 2 other warnings: -missing 'use strict' statement [ return Math.floor(Math.random()*upper)+1 ] -document.write can be a from of eval. [ document.write(randNum+''); ]

2 Answers

Steven Parker
Steven Parker
215,356 Points

The error is because you're using a host-based JavaScript engine, and the "document" object is something provided only in a browser.

The warnings are typical "best practice" reminders. While optional, "use strict" enforces good code practices. And both "document.write" and "eval" can pose security concerns when used carelessly, but this is not something you need be concerned with during the early stages of learning.

Thanks for taking the time to explain that.