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Clarify ToIndex, ToLength, and ToIntegerOrInfinity #2501

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Sep 22, 2021
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Clarify ToIndex, ToLength, and ToIntegerOrInfinity #2501

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34d4633
Editorial: Clarify ToIndex (#2501)
gibson042 Sep 22, 2021
a9221a0
Editorial: Clarify ToLength (#2501)
gibson042 Sep 22, 2021
1822f37
Editorial: Clarify ToIntegerOrInfinity (#2501)
gibson042 Sep 22, 2021
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22 changes: 11 additions & 11 deletions spec.html
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Original file line number Diff line number Diff line change
Expand Up @@ -5037,12 +5037,12 @@ <h1>
<emu-clause id="sec-tointegerorinfinity" type="abstract operation" oldids="sec-tointeger">
<h1>
ToIntegerOrInfinity (
_argument_: unknown,
_argument_: an ECMAScript language value,
)
</h1>
<dl class="header">
<dt>description</dt>
<dd>It converts _argument_ to an integer, +&infin;, or -&infin;.</dd>
<dd>It converts _argument_ to an integer representing its Number value with fractional part truncated, or to +&infin; or -&infin; when that Number value is infinite.</dd>
</dl>
<emu-alg>
1. Let _number_ be ? ToNumber(_argument_).
Expand Down Expand Up @@ -5582,12 +5582,12 @@ <h1>
<emu-clause id="sec-tolength" type="abstract operation">
<h1>
ToLength (
_argument_: unknown,
_argument_: an ECMAScript language value,
)
</h1>
<dl class="header">
<dt>description</dt>
<dd>It converts _argument_ to an integral Number suitable for use as the length of an array-like object.</dd>
<dd>It clamps _argument_ to an integral Number suitable for use as the length of an array-like object.</dd>
</dl>
<emu-alg>
1. Let _len_ be ? ToIntegerOrInfinity(_argument_).
Expand Down Expand Up @@ -5618,22 +5618,22 @@ <h1>
<emu-clause id="sec-toindex" type="abstract operation">
<h1>
ToIndex (
_value_: unknown,
_value_: an ECMAScript language value,
)
</h1>
<dl class="header">
<dt>description</dt>
<dd>It returns _value_ argument converted to a non-negative integer if it is a valid integer index value.</dd>
<dd>It converts _value_ to a non-negative integer if the corresponding decimal representation, as a String, is an integer index.</dd>
</dl>
<emu-alg>
1. If _value_ is *undefined*, then
1. Return 0.
1. Else,
1. Let _integerIndex_ be 𝔽(? ToIntegerOrInfinity(_value_)).
1. If _integerIndex_ &lt; *+0*<sub>𝔽</sub>, throw a *RangeError* exception.
1. Let _index_ be ! ToLength(_integerIndex_).
1. If ! SameValue(_integerIndex_, _index_) is *false*, throw a *RangeError* exception.
1. Return ℝ(_index_).
1. Let _integer_ be ? ToIntegerOrInfinity(_value_).
1. Let _clamped_ be ! ToLength(𝔽(_integer_)).
1. If ! SameValue(𝔽(_integer_), _clamped_) is *false*, throw a *RangeError* exception.
1. Assert: 0 &le; _integer_ &le; 2<sup>53</sup> - 1.
1. Return _integer_.
</emu-alg>
</emu-clause>
</emu-clause>
Expand Down