My read of section 12.8.3.1 (https://tc39.github.io/ecma262/#sec-addition-operator-plus-runtime-semantics-evaluation), is that V8 is getting this right.
ToPrimitive on `{}` will, by default, return “[object Object]” — We first call
`Object.prototype.valueOf()`, which returns `this` (see 19.1.3.7). Following
this, we call `toString()`, and get “[object Object]”.
Subsequent steps of the algorithm just concatenate the two strings together. So
it looks like the other vendors are getting this wrong?
> On Apr 13, 2016, at 10:20 AM, Michał Wadas <[email protected]> wrote:
>
> Short question - code
> {}+{}
> V8 result: "[object Object][object Object]"
> Safari, Firefox, Edge: NaN
>
> Which one is correct?
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