gmosx

Nasty JavaScript catch

by gmosx, at 08 Jul 2009
JavaScript definitely has some rough edges. Consider this:

parseInt("07") // => 7
parseInt("08") // => NaN 

This is a great reason for a 20 minutes long debugging session :(

35 Comments

by dionyziz, at 25 Aug 2009
Starting a numeric string with a zero marks it as being in oct format?
by Stickupkid, at 02 Sep 2009
You should always supply a base number as the second argument when using parseInt() - base 10 in this instance. You can never rely on it being accurate 100% of the time especially if the user can input the string.
by Nick Fitzgerald, at 29 Jan 2010
Yup, I've been burned by that before and now I've made it a habit whenever I use parseInt to pass 10 in as the second argument.
by George Moschovitis, at 29 Jan 2010
Yeah, I use parseInt(x, 10)
I think Number(10) also works (and looks better)
by George Moschovitis, at 13 Feb 2010
For more JavaScript wtf moments check this out:

http://wtfjs.com/
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