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Claude Pache (2015-06-03T10:38:41.000Z)

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> 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:

https://people.mozilla.org/~jorendorff/es6-draft.html#sec-isconcatspreadable

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.

—Claude
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d at domenic.me (2015-06-08T00:06:49.504Z)

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.


Look at the IsConcatSpreadable abstract operation:

https://people.mozilla.org/~jorendorff/es6-draft.html#sec-isconcatspreadable

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.

d at domenic.me (2015-06-08T00:06:44.454Z)

> 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.


Look at the IsConcatSpreadable abstract operation:

https://people.mozilla.org/~jorendorff/es6-draft.html#sec-isconcatspreadable

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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