madrobby/gist:4556637

Created January 17, 2013 15:15

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gistfile1.txt

	$ irb
	irb(main):001:0> 10000000000000000 == 10000000000000001
	=> false

	$ node
	> 10000000000000000 == 10000000000000001
	true

alloy commented Jan 17, 2013

It is clear that JS+Node scale better, they can do more comparisons with only one object!

» /System/Library/Frameworks/JavaScriptCore.framework/Versions/A/Resources/jsc
> 10000000000000000 == 10000000000000001
true
> 10000000000000000 == 10000000000000000
true
> 10000000000000000 == 9999999999999999
true

ThisIsMissEm commented Jan 17, 2013

Is this because of the actual size of the number and how it is stored? I'm thinking similar to the 0.2 + 0.1 == 0.3 bug.

jwarchol commented Jan 17, 2013

JS stores numbers as floating point values only, no true integers, and only 53 bits precision for the left side of the decimal (I think).

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