Welcome to the Treehouse Community

Want to collaborate on code errors? Have bugs you need feedback on? Looking for an extra set of eyes on your latest project? Get support with fellow developers, designers, and programmers of all backgrounds and skill levels here with the Treehouse Community!

Looking to learn something new?

Treehouse offers a seven day free trial for new students. Get access to thousands of hours of content and join thousands of Treehouse students and alumni in the community today.

Start your free trial

JavaScript

Gustavo Winter
PLUS
Gustavo Winter
Courses Plus Student 27,382 Points
Posted by Gustavo Winter
Gustavo Winter
Courses Plus Student 27,382 Points

When should i use 'use strict' ?

I finished "Introducing ES2015" , all over the course, i see at the top of the page 'use strict'

My doubt is, when should i use this?

1 Answer

Steven Parker
Steven Parker
225,730 Points
Steven Parker
Steven Parker
225,730 Points

Some people would say "always", since it primary makes bad programming practices into fatal errors. Those same people would say that not using it is "sloppy mode". :wink:

For details on what differences it makes, see this MDN page on Transitioning to strict mode.