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Add the new method names to Array.prototype [ @@unscopables ] #35

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Jan 4, 2022
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Add the new method names to Array.prototype [ @@unscopables ] #35

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Add the new method names to Array.prototype [ @@unscopables ]
legendecas Jan 4, 2022
39c7558
Update spec.emu
legendecas Jan 4, 2022
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26 changes: 26 additions & 0 deletions spec.emu
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Expand Up @@ -115,4 +115,30 @@ location: https://tc39.es/proposal-array-grouping/
</emu-alg>
</emu-clause>
</ins>

<emu-clause id="sec-array.prototype-@@unscopables">
<h1>Array.prototype [ @@unscopables ]</h1>
<p>The initial value of the @@unscopables data property is an object created by the following steps:</p>
<emu-alg>
1. Let _unscopableList_ be ! OrdinaryObjectCreate(*null*).
1. Perform ! CreateDataPropertyOrThrow(_unscopableList_, *"at"*, *true*).
1. Perform ! CreateDataPropertyOrThrow(_unscopableList_, *"copyWithin"*, *true*).
1. Perform ! CreateDataPropertyOrThrow(_unscopableList_, *"entries"*, *true*).
1. Perform ! CreateDataPropertyOrThrow(_unscopableList_, *"fill"*, *true*).
1. Perform ! CreateDataPropertyOrThrow(_unscopableList_, *"find"*, *true*).
1. Perform ! CreateDataPropertyOrThrow(_unscopableList_, *"findIndex"*, *true*).
1. Perform ! CreateDataPropertyOrThrow(_unscopableList_, *"flat"*, *true*).
1. Perform ! CreateDataPropertyOrThrow(_unscopableList_, *"flatMap"*, *true*).
1. <ins>Perform ! CreateDataPropertyOrThrow(_unscopableList_, *"groupBy"*, *true*).</ins>
1. <ins>Perform ! CreateDataPropertyOrThrow(_unscopableList_, *"groupByToMap"*, *true*).</ins>
1. Perform ! CreateDataPropertyOrThrow(_unscopableList_, *"includes"*, *true*).
1. Perform ! CreateDataPropertyOrThrow(_unscopableList_, *"keys"*, *true*).
1. Perform ! CreateDataPropertyOrThrow(_unscopableList_, *"values"*, *true*).
1. Return _unscopableList_.
</emu-alg>
<p>This property has the attributes { [[Writable]]: *false*, [[Enumerable]]: *false*, [[Configurable]]: *true* }.</p>
<emu-note>
<p>The own property names of this object are property names that were not included as standard properties of `Array.prototype` prior to the ECMAScript 2015 specification. These names are ignored for `with` statement binding purposes in order to preserve the behaviour of existing code that might use one of these names as a binding in an outer scope that is shadowed by a `with` statement whose binding object is an Array.</p>
</emu-note>
</emu-clause>
</emu-clause>