JS method parseFloat does not return correct value

Question

parseFloat("-999999999999999.9991") returns -1000000000000000

and when debuging

(-1000000000000000 == -999999999999999.999) condition is true.

anthares · Accepted Answer · 2011-05-05 08:44:45Z

4

Operations with float data type have limited precision and they often introduce errors when rounding numbers like your case.

answered May 5, 2011 at 8:44

anthares

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2 Comments

Colin Over a year ago

how to make it return true like parseFloat("-999999999999999.9991") < -999999999999999.999

anthares Over a year ago

Well, in other programming languages you can use the decimal data type. In javascript there is no such data type, though and the solution is a little bit trickier. You can check the following links for a workaround of this problem: stackoverflow.com/questions/1458633/… or mredkj.com/javascript/nfbasic2.html. In general you should round your number to 2 or 3 signs after the decimal point before involving them in any operation.

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