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! While you're at it, check out some resources Treehouse students have shared here.

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 JavaScript Foundations Numbers Parsing Numbers From Strings

Brian CI
Brian CI
28,971 Points
Posted by Brian CI
Brian CI
28,971 Points

var j = parseInt("012); different on firefox than chrome?

I am using firefox instead of chrome and with firefox I get j = 12 and not 10 as in the video. Is this cause for concern?

2 Answers

bothxp
bothxp
16,510 Points

Have a look at the Teachers notes on that video:

"Teacher's Notes

Please note that newer browsers will return 12 for parseInt("012") and not 10. This is because the default second parameter is now 10 for decimal instead of 8 for octal.

Always specify the base if you're parsing a string to maximize compatibility.

parseInt("012", 10); //For decimal parseInt("012", 8); //For octal"

bothxp
bothxp
16,510 Points
bothxp
bothxp
16,510 Points

I just tried it using FF and got 12

> var j = parseInt("012");
undefined
> j
12
Brian CI
Brian CI
28,971 Points
Brian CI
Brian CI
28,971 Points

Does it match the video in Chrome?