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Editorial: CreateListFromArrayLike: change element type list to a 2-state enum #3409

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Sep 5, 2024
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Editorial: CreateListFromArrayLike: change element type list to a 2-state enum #3409

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7 changes: 3 additions & 4 deletions spec.html
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Original file line number Diff line number Diff line change
Expand Up @@ -6471,23 +6471,22 @@ <h1>
<h1>
CreateListFromArrayLike (
_obj_: an ECMAScript language value,
optional _elementTypes_: a List of names of ECMAScript Language Types,
optional _requirePropertyKeys_: a boolean,
): either a normal completion containing a List of ECMAScript language values or a throw completion
</h1>
<dl class="header">
<dt>description</dt>
<dd>It is used to create a List value whose elements are provided by the indexed properties of _obj_. _elementTypes_ contains the names of ECMAScript Language Types that are allowed for element values of the List that is created.</dd>
</dl>
<emu-alg>
1. If _elementTypes_ is not present, set _elementTypes_ to « Undefined, Null, Boolean, String, Symbol, Number, BigInt, Object ».
1. If _obj_ is not an Object, throw a *TypeError* exception.
1. Let _len_ be ? LengthOfArrayLike(_obj_).
1. Let _list_ be a new empty List.
1. Let _index_ be 0.
1. Repeat, while _index_ &lt; _len_,
1. Let _indexName_ be ! ToString(𝔽(_index_)).
1. Let _next_ be ? Get(_obj_, _indexName_).
1. If _elementTypes_ does not contain Type(_next_), throw a *TypeError* exception.
1. If _requirePropertyKeys_ is *true* and _next_ is not a property key, throw a *TypeError* exception.
1. Append _next_ to _list_.
1. Set _index_ to _index_ + 1.
1. Return _list_.
Expand Down Expand Up @@ -15885,7 +15884,7 @@ <h1>[[OwnPropertyKeys]] ( ): either a normal completion containing a List of pro
1. If _trap_ is *undefined*, then
1. Return ? <emu-meta effects="user-code">_target_.[[OwnPropertyKeys]]()</emu-meta>.
1. Let _trapResultArray_ be ? Call(_trap_, _handler_, « _target_ »).
1. Let _trapResult_ be ? CreateListFromArrayLike(_trapResultArray_, « String, Symbol »).
1. Let _trapResult_ be ? CreateListFromArrayLike(_trapResultArray_, *true*).
1. If _trapResult_ contains any duplicate entries, throw a *TypeError* exception.
1. Let _extensibleTarget_ be ? IsExtensible(_target_).
1. Let _targetKeys_ be ? <emu-meta effects="user-code">_target_.[[OwnPropertyKeys]]()</emu-meta>.
Expand Down
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