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‎demo/lib/index.d.ts‎

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@@ -2,5 +2,5 @@ declare const IteratorPrototype: any;
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declare function liftIterator<A>(iter: Iterator<A>): Iterable<A>;
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declare function chunksImpl<A>(iter: Iterator<A>, chunkSize: number): Generator<Array<A>>;
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declare function chunks<A>(this: Iterator<A>, chunkSize: number): Generator<Array<A>>;
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declare function windowsImpl<A>(iter: Iterator<A>, windowSize: number, undersized: 'only full' | 'allow partial'): Generator<Array<A>>;
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declare function windows<A>(this: Iterator<A>, windowSize: number, undersized?: 'only full' | 'allow partial'): Generator<Array<A>>;
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declare function windowsImpl<A>(iter: Iterator<A>, windowSize: number, undersized: 'only-full' | 'allow-partial'): Generator<Array<A>>;
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declare function windows<A>(this: Iterator<A>, windowSize: number, undersized?: 'only-full' | 'allow-partial'): Generator<Array<A>>;

‎demo/lib/index.js‎

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‎index.html‎

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</ul></div><div id="menu-toggle"><svg xmlns="http://www.w3.org/2000/svg" style="width:100%; height:100%; stroke:currentColor" viewBox="0 0 120 120" width="54" height="54">
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<title>Menu</title>
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<path stroke-width="10" stroke-linecap="round" d="M30,60 h60 M30,30 m0,5 h60 M30,90 m0,-5 h60"></path>
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</svg></div><div id="menu-spacer" class="menu-spacer"></div><div id="menu"><div id="menu-search"><input type="text" id="menu-search-box" placeholder="Search..."><div id="menu-search-results" class="inactive"></div></div><div id="menu-pins"><div class="menu-pane-header">Pins<button class="unpin-all">clear</button></div><ul id="menu-pins-list"></ul></div><div class="menu-pane-header">Table of Contents</div><div id="menu-toc"><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-iterator.prototype.chunks" title="Iterator.prototype.chunks ( chunkSize )"><span class="secnum">1</span> Iterator.prototype.chunks ( <var>chunkSize</var> )</a></li><li><span class="item-toggle-none"></span><a href="#sec-iterator.prototype.windows" title="Iterator.prototype.windows ( windowSize [ , undersized ] )"><span class="secnum">2</span> Iterator.prototype.windows ( <var>windowSize</var> [ , <var>undersized</var> ] )</a></li></ol></div></div><div id="spec-container"><h1 class="version">Stage 2 Draft / September 11, 2025</h1><h1 class="title">Iterator Chunking</h1>
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</svg></div><div id="menu-spacer" class="menu-spacer"></div><div id="menu"><div id="menu-search"><input type="text" id="menu-search-box" placeholder="Search..."><div id="menu-search-results" class="inactive"></div></div><div id="menu-pins"><div class="menu-pane-header">Pins<button class="unpin-all">clear</button></div><ul id="menu-pins-list"></ul></div><div class="menu-pane-header">Table of Contents</div><div id="menu-toc"><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-iterator.prototype.chunks" title="Iterator.prototype.chunks ( chunkSize )"><span class="secnum">1</span> Iterator.prototype.chunks ( <var>chunkSize</var> )</a></li><li><span class="item-toggle-none"></span><a href="#sec-iterator.prototype.windows" title="Iterator.prototype.windows ( windowSize [ , undersized ] )"><span class="secnum">2</span> Iterator.prototype.windows ( <var>windowSize</var> [ , <var>undersized</var> ] )</a></li></ol></div></div><div id="spec-container"><h1 class="version">Stage 2 Draft / September 16, 2025</h1><h1 class="title">Iterator Chunking</h1>
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<emu-clause id="sec-iterator.prototype.chunks">
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<h1><span class="secnum">1</span> Iterator.prototype.chunks ( <var>chunkSize</var> )</h1>
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<emu-clause id="sec-iterator.prototype.windows">
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<h1><span class="secnum">2</span> Iterator.prototype.windows ( <var>windowSize</var> [ , <var>undersized</var> ] )</h1>
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<p>This method performs the following steps when called:</p>
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<emu-alg><ol><li>Let <var>O</var> be the <emu-val>this</emu-val> value.</li><li>If <var>O</var> <emu-xref href="#sec-object-type"><a href="https://tc39.es/ecma262/#sec-object-type">is not an Object</a></emu-xref>, throw a <emu-val>TypeError</emu-val> exception.</li><li>Let <var>iterated</var> be the <emu-xref href="#sec-iterator-records"><a href="https://tc39.es/ecma262/#sec-iterator-records">Iterator Record</a></emu-xref> { <var class="field">[[Iterator]]</var>: <var>O</var>, <var class="field">[[NextMethod]]</var>: <emu-val>undefined</emu-val>, <var class="field">[[Done]]</var>: <emu-val>false</emu-val>&nbsp;}.</li><li>If <var>windowSize</var> is not an <emu-xref href="#integral-number"><a href="https://tc39.es/ecma262/#integral-number">integral Number</a></emu-xref> in the <emu-xref href="#inclusive-interval"><a href="https://tc39.es/ecma262/#inclusive-interval">inclusive interval</a></emu-xref> from <emu-val>1</emu-val><sub>𝔽</sub> to <emu-xref aoid="𝔽"><a href="https://tc39.es/ecma262/#𝔽">𝔽</a></emu-xref>(2<sup>32</sup> - 1), then<ol><li>Let <var>error</var> be <emu-xref aoid="ThrowCompletion"><a href="https://tc39.es/ecma262/#sec-throwcompletion">ThrowCompletion</a></emu-xref>(a newly created <emu-val>RangeError</emu-val> object).</li><li>Return ?&nbsp;<emu-xref aoid="IteratorClose"><a href="https://tc39.es/ecma262/#sec-iteratorclose" class="e-user-code">IteratorClose</a></emu-xref>(<var>iterated</var>, <var>error</var>).</li></ol></li><li>If <var>undersized</var> is <emu-val>undefined</emu-val>, set <var>undersized</var> to <emu-val>"only full"</emu-val>.</li><li>If <var>undersized</var> is neither <emu-val>"only full"</emu-val> nor <emu-val>"allow partial"</emu-val>, then<ol><li>Let <var>error</var> be <emu-xref aoid="ThrowCompletion"><a href="https://tc39.es/ecma262/#sec-throwcompletion">ThrowCompletion</a></emu-xref>(a newly created <emu-val>TypeError</emu-val> object).</li><li>Return ?&nbsp;<emu-xref aoid="IteratorClose"><a href="https://tc39.es/ecma262/#sec-iteratorclose" class="e-user-code">IteratorClose</a></emu-xref>(<var>iterated</var>, <var>error</var>).</li></ol></li><li>Set <var>iterated</var> to ?&nbsp;<emu-xref aoid="GetIteratorDirect"><a href="https://tc39.es/ecma262/#sec-getiteratordirect" class="e-user-code">GetIteratorDirect</a></emu-xref>(<var>O</var>).</li><li>Let <var>closure</var> be a new <emu-xref href="#sec-abstract-closure"><a href="https://tc39.es/ecma262/#sec-abstract-closure">Abstract Closure</a></emu-xref> with no parameters that captures <var>iterated</var>, <var>windowSize</var>, and <var>undersized</var> and performs the following steps when called:<ol><li>Let <var>buffer</var> be a new empty <emu-xref href="#sec-list-and-record-specification-type"><a href="https://tc39.es/ecma262/#sec-list-and-record-specification-type">List</a></emu-xref>.</li><li>Repeat,<ol><li>Let <var>value</var> be ?&nbsp;<emu-xref aoid="IteratorStepValue"><a href="https://tc39.es/ecma262/#sec-iteratorstepvalue" class="e-user-code">IteratorStepValue</a></emu-xref>(<var>iterated</var>).</li><li>If <var>value</var> is <emu-const>done</emu-const>, then<ol><li>If <var>undersized</var> is <emu-val>"allow partial"</emu-val>, <var>buffer</var> is not empty, and the number of elements in <var>buffer</var> &lt; <emu-xref aoid="ℝ"><a href="https://tc39.es/ecma262/#ℝ">ℝ</a></emu-xref>(<var>windowSize</var>), then<ol><li>Perform <emu-xref aoid="Completion"><a href="https://tc39.es/ecma262/#sec-completion-ao">Completion</a></emu-xref>(<emu-xref aoid="Yield"><a href="https://tc39.es/ecma262/#sec-yield" class="e-user-code">Yield</a></emu-xref>(<emu-xref aoid="CreateArrayFromList"><a href="https://tc39.es/ecma262/#sec-createarrayfromlist">CreateArrayFromList</a></emu-xref>(<var>buffer</var>))).</li></ol></li><li>Return <emu-xref aoid="ReturnCompletion"><a href="https://tc39.es/ecma262/#sec-returncompletion">ReturnCompletion</a></emu-xref>(<emu-val>undefined</emu-val>).</li></ol></li><li>If the number of elements in <var>buffer</var> is <emu-xref aoid="ℝ"><a href="https://tc39.es/ecma262/#ℝ">ℝ</a></emu-xref>(<var>windowSize</var>), then<ol><li>Remove the first element from <var>buffer</var>.</li></ol></li><li>Append <var>value</var> to <var>buffer</var>.</li><li>If the number of elements in <var>buffer</var> is <emu-xref aoid="ℝ"><a href="https://tc39.es/ecma262/#ℝ">ℝ</a></emu-xref>(<var>windowSize</var>), then<ol><li>Let <var>completion</var> be <emu-xref aoid="Completion"><a href="https://tc39.es/ecma262/#sec-completion-ao">Completion</a></emu-xref>(<emu-xref aoid="Yield"><a href="https://tc39.es/ecma262/#sec-yield" class="e-user-code">Yield</a></emu-xref>(<emu-xref aoid="CreateArrayFromList"><a href="https://tc39.es/ecma262/#sec-createarrayfromlist">CreateArrayFromList</a></emu-xref>(<var>buffer</var>))).</li><li><emu-xref aoid="IfAbruptCloseIterator"><a href="https://tc39.es/ecma262/#sec-ifabruptcloseiterator" class="e-user-code">IfAbruptCloseIterator</a></emu-xref>(<var>completion</var>, <var>iterated</var>).</li></ol></li></ol></li></ol></li><li>Let <var>result</var> be <emu-xref aoid="CreateIteratorFromClosure"><a href="https://tc39.es/ecma262/#sec-createiteratorfromclosure">CreateIteratorFromClosure</a></emu-xref>(<var>closure</var>, <emu-val>"Iterator Helper"</emu-val>, <emu-xref href="#sec-%iteratorhelperprototype%-object"><a href="https://tc39.es/ecma262/#sec-%iteratorhelperprototype%-object">%IteratorHelperPrototype%</a></emu-xref>, « <var class="field">[[UnderlyingIterators]]</var>&nbsp;»).</li><li>Set <var>result</var>.<var class="field">[[UnderlyingIterators]]</var> to « <var>iterated</var>&nbsp;».</li><li>Return <var>result</var>.</li></ol></emu-alg>
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<emu-alg><ol><li>Let <var>O</var> be the <emu-val>this</emu-val> value.</li><li>If <var>O</var> <emu-xref href="#sec-object-type"><a href="https://tc39.es/ecma262/#sec-object-type">is not an Object</a></emu-xref>, throw a <emu-val>TypeError</emu-val> exception.</li><li>Let <var>iterated</var> be the <emu-xref href="#sec-iterator-records"><a href="https://tc39.es/ecma262/#sec-iterator-records">Iterator Record</a></emu-xref> { <var class="field">[[Iterator]]</var>: <var>O</var>, <var class="field">[[NextMethod]]</var>: <emu-val>undefined</emu-val>, <var class="field">[[Done]]</var>: <emu-val>false</emu-val>&nbsp;}.</li><li>If <var>windowSize</var> is not an <emu-xref href="#integral-number"><a href="https://tc39.es/ecma262/#integral-number">integral Number</a></emu-xref> in the <emu-xref href="#inclusive-interval"><a href="https://tc39.es/ecma262/#inclusive-interval">inclusive interval</a></emu-xref> from <emu-val>1</emu-val><sub>𝔽</sub> to <emu-xref aoid="𝔽"><a href="https://tc39.es/ecma262/#𝔽">𝔽</a></emu-xref>(2<sup>32</sup> - 1), then<ol><li>Let <var>error</var> be <emu-xref aoid="ThrowCompletion"><a href="https://tc39.es/ecma262/#sec-throwcompletion">ThrowCompletion</a></emu-xref>(a newly created <emu-val>RangeError</emu-val> object).</li><li>Return ?&nbsp;<emu-xref aoid="IteratorClose"><a href="https://tc39.es/ecma262/#sec-iteratorclose" class="e-user-code">IteratorClose</a></emu-xref>(<var>iterated</var>, <var>error</var>).</li></ol></li><li>If <var>undersized</var> is <emu-val>undefined</emu-val>, set <var>undersized</var> to <emu-val>"only-full"</emu-val>.</li><li>If <var>undersized</var> is neither <emu-val>"only-full"</emu-val> nor <emu-val>"allow-partial"</emu-val>, then<ol><li>Let <var>error</var> be <emu-xref aoid="ThrowCompletion"><a href="https://tc39.es/ecma262/#sec-throwcompletion">ThrowCompletion</a></emu-xref>(a newly created <emu-val>TypeError</emu-val> object).</li><li>Return ?&nbsp;<emu-xref aoid="IteratorClose"><a href="https://tc39.es/ecma262/#sec-iteratorclose" class="e-user-code">IteratorClose</a></emu-xref>(<var>iterated</var>, <var>error</var>).</li></ol></li><li>Set <var>iterated</var> to ?&nbsp;<emu-xref aoid="GetIteratorDirect"><a href="https://tc39.es/ecma262/#sec-getiteratordirect" class="e-user-code">GetIteratorDirect</a></emu-xref>(<var>O</var>).</li><li>Let <var>closure</var> be a new <emu-xref href="#sec-abstract-closure"><a href="https://tc39.es/ecma262/#sec-abstract-closure">Abstract Closure</a></emu-xref> with no parameters that captures <var>iterated</var>, <var>windowSize</var>, and <var>undersized</var> and performs the following steps when called:<ol><li>Let <var>buffer</var> be a new empty <emu-xref href="#sec-list-and-record-specification-type"><a href="https://tc39.es/ecma262/#sec-list-and-record-specification-type">List</a></emu-xref>.</li><li>Repeat,<ol><li>Let <var>value</var> be ?&nbsp;<emu-xref aoid="IteratorStepValue"><a href="https://tc39.es/ecma262/#sec-iteratorstepvalue" class="e-user-code">IteratorStepValue</a></emu-xref>(<var>iterated</var>).</li><li>If <var>value</var> is <emu-const>done</emu-const>, then<ol><li>If <var>undersized</var> is <emu-val>"allow-partial"</emu-val>, <var>buffer</var> is not empty, and the number of elements in <var>buffer</var> &lt; <emu-xref aoid="ℝ"><a href="https://tc39.es/ecma262/#ℝ">ℝ</a></emu-xref>(<var>windowSize</var>), then<ol><li>Perform <emu-xref aoid="Completion"><a href="https://tc39.es/ecma262/#sec-completion-ao">Completion</a></emu-xref>(<emu-xref aoid="Yield"><a href="https://tc39.es/ecma262/#sec-yield" class="e-user-code">Yield</a></emu-xref>(<emu-xref aoid="CreateArrayFromList"><a href="https://tc39.es/ecma262/#sec-createarrayfromlist">CreateArrayFromList</a></emu-xref>(<var>buffer</var>))).</li></ol></li><li>Return <emu-xref aoid="ReturnCompletion"><a href="https://tc39.es/ecma262/#sec-returncompletion">ReturnCompletion</a></emu-xref>(<emu-val>undefined</emu-val>).</li></ol></li><li>If the number of elements in <var>buffer</var> is <emu-xref aoid="ℝ"><a href="https://tc39.es/ecma262/#ℝ">ℝ</a></emu-xref>(<var>windowSize</var>), then<ol><li>Remove the first element from <var>buffer</var>.</li></ol></li><li>Append <var>value</var> to <var>buffer</var>.</li><li>If the number of elements in <var>buffer</var> is <emu-xref aoid="ℝ"><a href="https://tc39.es/ecma262/#ℝ">ℝ</a></emu-xref>(<var>windowSize</var>), then<ol><li>Let <var>completion</var> be <emu-xref aoid="Completion"><a href="https://tc39.es/ecma262/#sec-completion-ao">Completion</a></emu-xref>(<emu-xref aoid="Yield"><a href="https://tc39.es/ecma262/#sec-yield" class="e-user-code">Yield</a></emu-xref>(<emu-xref aoid="CreateArrayFromList"><a href="https://tc39.es/ecma262/#sec-createarrayfromlist">CreateArrayFromList</a></emu-xref>(<var>buffer</var>))).</li><li><emu-xref aoid="IfAbruptCloseIterator"><a href="https://tc39.es/ecma262/#sec-ifabruptcloseiterator" class="e-user-code">IfAbruptCloseIterator</a></emu-xref>(<var>completion</var>, <var>iterated</var>).</li></ol></li></ol></li></ol></li><li>Let <var>result</var> be <emu-xref aoid="CreateIteratorFromClosure"><a href="https://tc39.es/ecma262/#sec-createiteratorfromclosure">CreateIteratorFromClosure</a></emu-xref>(<var>closure</var>, <emu-val>"Iterator Helper"</emu-val>, <emu-xref href="#sec-%iteratorhelperprototype%-object"><a href="https://tc39.es/ecma262/#sec-%iteratorhelperprototype%-object">%IteratorHelperPrototype%</a></emu-xref>, « <var class="field">[[UnderlyingIterators]]</var>&nbsp;»).</li><li>Set <var>result</var>.<var class="field">[[UnderlyingIterators]]</var> to « <var>iterated</var>&nbsp;».</li><li>Return <var>result</var>.</li></ol></emu-alg>
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