Sometimes you see of frameworks like ReactJS uses Object.is()
, and how can you think of it?
It really is just the same as ===
except two cases:
> 0 === -0
true
> Object.is(0, -0)
false
> NaN === NaN
false
> Object.is(NaN, NaN)
true
Object.is()
works just like ===
except these two cases, so next time when you see Object.is()
, you can think of it roughly equivalent to ===
except these two minor details.
This is in fact the comparison method used in ReactJS Hooks, such as useEffect()
, where the dependency array elements are compared using Object.is()
.
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