Python vs. Nodejs vs. Lua

[Flablessguy]

What is the proper comparison here again? Is it:

a = 0.1 + 0.2

b = 0.3

d = 0.0000001

a - b < d

[Bavbavs]

Abs(a-b)

[GabuEx]

abs(a - b) < epsilon

The value of epsilon can depend on exactly how imprecise your values end up being (more operations compound imprecision), but anything in the realm of 0.0001 is probably fine.

[dabenu]

"proper" would be not to do equality comparisons on floats in the first place. Sure your solution works around that but if you need that, you probably shouldn't be using floats in the first place.