How come parseInt("08") = 0, parseInt("07") = 7

Question

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JavaScript function parseInt() doesn't parse numbers with leading 0 correctly

Strange issues when parsing in JS occur.

parseInt("08")
//The result is: 0

parseInt("07")
//The result is: 7

Why is this happening?

https://developer.mozilla.org/en-US/docs/JavaScript/Reference/Global_Objects/parseInt — BalusC, Sep 29 '12 at 11:31

score 11 · Accepted Answer · answered Sep 29 '12 at 11:30

11

Because of the 0 prefix. It tells Javascript the number is Octal, in base-8. 8 isn't a legal octal digit.

Use parseInt("8") instead, or as @Gumbo so correctly pointed out - parseInt("08", 10)

answered Sep 29 '12 at 11:30

zmbq

1 Answers1