Claude Pache claude.pache at gmail.com
Wed Jun 3 10:38:41 UTC 2015

> Le 3 juin 2015 à 11:08, Axel Rauschmayer <axel at rauschma.de> a écrit :
> https://people.mozilla.org/~jorendorff/es6-draft.html#sec-array.prototype.concat <https://people.mozilla.org/~jorendorff/es6-draft.html#sec-array.prototype.concat>
> I’m not seeing @@isConcatSpreadable being used as a property key anywhere in the spec.
> Thanks!
> Axel

Look at the IsConcatSpreadable abstract operation:


Note that, in absence of @@isConcatSpreadable property key, IsArray() is considered instead,
so that builtin objects and constructors defined in the spec do not need to use @@isConcatSpreadable in order to get the right semantics.

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