Have you performed simple arithmetic operations like 0.1 + 0.2? You might have gotten something strange: 0.1 + 0.2 = 0.30000000000000004.
Floating-point arithmetic is important to understand at least vaguely since it’s a pretty leaky abstraction. Fortunately, we don’t need a “✨Member-only story” on Medium to get acquainted with the underlying concepts.
It also includes a non member link
That link didn’t work for me.
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Ugh, i thought this was a question, not a link. So i spent time googling for a good tutorial on floats (because I didn’t click the link)…
Now i hate myself, and this post.
Don’t hate yourself. At least you searched it properly. See it this way, you learned from a failure more than anyone who did not fail. You are now stronger!
assuming i learned, lol :D
It’s how CPUs do floating point calculations. It’s not just javascript. Long story short, a float is stored in the format of one bit for the +/-, some bits for a base value (mantissa), and some bits for the exponent. As a result, some numbers aren’t quite representable exactly.
A good way to think of it is to compare something similar in decimal. .1 and .2 are precise values in decimal, but can’t be represented as perfectly in binary. 1/3 might be a pretty good similar-enough example. With a lack of precision, that might become 0.33333333, which when added in the expression 1/3 + 1/3 + 1/3 will give you 0.99999999, instead of the correct answer of 1.
Python has no issues representing
1/3 + 1/3 + 1/3as 1. I just opened a python interpreter, imported absolutely no libraries and typed
1/3 + 1/3 + 1/3enter and got 1 as the result. Seems like if python could do that, JavaScript should be able to as well.I thought it was a rather simple analogue, but I guess it was too complicated for some?
I said nothing about JavaScript or Python or any other language with my 1/3 example. I wasn’t even talking about binary. It was an example of something that might be problematic if you added numbers in an imprecise way in decimal, the same way binary floating point fails to accurately represent 1/10 + 1/5 from the OP.
Perhaps the following rewording of your last sentence would be easier for readers to follow along:
With a lack of precision, 1/3 might become 0.33333333. When evaluating the expression 1/3 + 1/3 + 1/3, using 0.33333333 as an approximate representation of 1/3 will return a result of 0.99999999, instead of the correct answer of 1.
Now try opening js interpreter and doing the same.
Also, try
0.1+0.2in python interpreter.I’ll pass on the js interpreter. I don’t feel like learning the arcane runes.
To your point, Python handles those by giving you 0.300000004 might have missed a zero but valid point nonetheless
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If you are adding 0.1 + 0.2, then it means you can cut off anything after the first digit (after the dot off course). Because the rest of the 0.1 is only 0 and the rest of 0.2 is 0. That can help with rounding errors on floating point calculations. I don’t program JavaScript, so no idea what the best way to go about it would be.
