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Workarounds for JavaScript parseInt octal bug
I've been working on a javascript function, setting date objects by declaring the year, month & date. However, when the month has a value of 08 or 09, 0 is returned when using parseInt(). See below:
parseInt("01") //returns 1
parseInt("02") //returns 2
parseInt("03") //returns 3
parseInt("04") //returns 4
parseInt("05") //returns 5
parseInt("06") //returns 6
parseInt("07") //returns 7
parseInt("08") //returns 0?
parseInt("09") //returns 0?
parseInt("10") //returns 10
I've created a jsFiddle to demonstrate this issue:
http://jsfiddle.net/GhkEf/
Why does parseInt("08") and parseInt("09") return 0?
697
The parseInt function converts its first argument to a string, parses that string, then returns an integer or NaN . If not NaN , the return value will be the integer that is the first argument taken as a number in the specified radix .
If parseInt() is given an empty string or a null value it will also return NaN, rather than converting them to 0. This gives us a mechanism by which we can test values using a combination of parseInt() and isNaN().
Try replacing your return with return decimalnum; -- you may still be returning undefined. parseInt is not for rounding - it actually takes the integer component of a number, or coerces a string to be a number. If you want to round, use Math. round .
parseFloat( ) parseFloat() is quite similar to parseInt() , with two main differences. First, unlike parseInt() , parseFloat() does not take a radix as an argument. This means that string must represent a floating-point number in decimal form (radix 10), not octal (radix 8) or hexadecimal (radix 6).
That's because numbers started with 0 are considered to be octal. And 08 is a wrong number in octal.
Use parseInt('09', 10); instead.
79
It's being parsed as an octal number. Use the radix parameter in parseInt.
parseInt('08', 10);
An update: As of ES5, browsers should not have this bug. Octal literals require to be in the form 0o12 to be considered Octal numbers. 08 by default is now considered a decimal number in ES5, however, all browsers may not support this yet, so you should continue to pass the radix parameter to parseInt
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