why parseInt('08') is giving 0, whereas parseInt('07') is giving 7

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Workarounds for JavaScript parseInt octal bug

I am working on javascript, and I seem to find this strange, that the javascript function parseInt('08') is returning 0 and parseInt('07') is returning 7.

this behavior seems to be there in Firefox.

parseInt('08') is returning 8 in IE, but 0 in Firefox..

Why? I want parseInt('08') to return 8, as expected and getting in IE.

score 32 · Accepted Answer · answered Aug 02 '12 at 22:30

32

Yeah, I came across this one before. It is really odd because some browsers interpret this as you wanting to parse it in base 8. Consider the following article:

http://www.breakingpar.com/bkp/home.nsf/0/87256B280015193F87256C85006A6604

basically, you have to tell the parser to use base 10 numbers:

parseInt('08', '10');

answered Aug 02 '12 at 22:30

AceCorban

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`parseInt('08', '10');`? Really? Usually we will just do `+"08"`, since adding `+` in front of a String will turn it into Number without any problem. – Derek 朕會功夫 Aug 02 '12 at 23:07
@Derik Post hoc ergo propter hoc – lededje Dec 10 '13 at 16:48
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`parseInt` expects a number as second parameter so you should do `parseInt('08', 10)` instead of `parseInt('08', '10')` – Benjamin Wegman Feb 04 '15 at 12:44

why parseInt('08') is giving 0, whereas parseInt('07') is giving 7

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