parseInt method in javascript returns wrong values

Question

I have parsing values to integer in my function using parseInt, but when i parse the -4.450217635509901e-7 to integer it returns -4.

parseInt(-4.450217635509901e-7)=> -4

-4.450217635509901e-7 is nothing but -0.000000450217635509901 so it should return 0 but for me its returning -4.

How to parse the values having exponential?

Are you looking for Math.floor or Math.ceil or Math.round? It doesn't seem like parseInt is what you need here, as you already have a number. — elclanrs
– elclanrs, Commented Sep 3, 2014 at 5:57
There is no exponent to parse, since the number literal will already be evaluated when parseInt is called. All it gets is a number value. parseInt is intended to be used with strings. Please explain what you are trying to achieve. What happens in your case is that the number is converted to a string, and it will be formatted using scientific notation (basically the same notation you used for the number literal). parseInt iterates over every character, collecting those it understands (leading +/- and digits). . is neither so it stops and converts the collected chars to a number. — Felix Kling
– Felix Kling, Commented Sep 3, 2014 at 6:41

potato · Accepted Answer · 2014-09-03 06:03:47Z

2

parseInt parses a string as an integer. You are giving it a float (I don't even know why that is working). If you want to round it, use your choice of rounding methods from the Math object.

answered Sep 3, 2014 at 6:03

potato

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