You-dont-know-js: Float Subtraction: Unexpected result
1.00000100-0.00000100 results in 0.9999999999999999.
Why does this happen? How to get correct result?
amanshu-kataria
All 2 comments
It happens because of IEEE-754, nothing specific to JS. There's no way to get the math exact, but there is a way (covered in the Types & Grammar book) to use what's called the machine epsilon to check that the number you're comparing to is "close enough" to the number that it's considered within this margin of floating point error.
getify
on 1 Mar 2018
👍2
@getify Thanks for your response.
amanshu-kataria
on 1 Mar 2018
👍1
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Most helpful comment
It happens because of IEEE-754, nothing specific to JS. There's no way to get the math exact, but there is a way (covered in the Types & Grammar book) to use what's called the machine epsilon to check that the number you're comparing to is "close enough" to the number that it's considered within this margin of floating point error.