javascript Math.abs() different behaviour

Asked Oct 22 '14 at 07:28

Active Oct 22 '14 at 09:04

Viewed 24 times

I do not understand what's going on in these cases:

Math.abs(40.35 * 100)
->4035
Math.abs(40.36 * 100)
->4036
Math.abs(40.37 * 100)
->4036.9999999999995
Math.abs(40.38 * 100)
->4038.0000000000005
Math.abs(40.39 * 100)
->4039

Why does this happen? I though math.abs() returns absolute values (?).

Thank you a lot

EDIT* Thanks for the referencing link, did not find anything like that

edited Oct 22 '14 at 09:04

asked Oct 22 '14 at 07:28

xhallix

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Nothing to do with `abs`. Remove it and observe the same results. – user2864740 Oct 22 '14 at 07:31
1

`math.abs(x)` changes negative numbers to positive numbers. Did you want `math.round(x)` instead? – Paul Oct 22 '14 at 07:35
The same thing happens in decimal if you multiply 1/3 by 3 -- you get .99999... rather than 1. What don't you understand about finite precision? – David Schwartz Oct 22 '14 at 07:37

javascript Math.abs() different behaviour

0 Answers0