<!DOCTYPE html><html class="default" lang="en"><head><meta charSet="utf-8"/><meta http-equiv="x-ua-compatible" content="IE=edge"/><title>MapRow | Apache Arrow - v17.0.0-SNAPSHOT</title><meta name="description" content="Documentation for Apache Arrow"/><meta name="viewport" content="width=device-width, initial-scale=1"/><link rel="stylesheet" href="../assets/style.css"/><link rel="stylesheet" href="../assets/highlight.css"/><script defer src="../assets/main.js"></script><script async src="../assets/icons.js" id="tsd-icons-script"></script><script async src="../assets/search.js" id="tsd-search-script"></script><script async src="../assets/navigation.js" id="tsd-nav-script"></script></head><body><script>document.documentElement.dataset.theme = localStorage.getItem("tsd-theme") || "os";document.body.style.display="none";setTimeout(() => app?app.showPage():document.body.style.removeProperty("display"),500)</script><header class="tsd-page-toolbar"><div class="tsd-toolbar-contents container"><div class="table-cell" id="tsd-search" data-base=".."><div class="field"><label for="tsd-search-field" class="tsd-widget tsd-toolbar-icon search no-caption"><svg width="16" height="16" viewBox="0 0 16 16" fill="none"><use href="../assets/icons.svg#icon-search"></use></svg></label><input type="text" id="tsd-search-field" aria-label="Search"/></div><div class="field"><div id="tsd-toolbar-links"></div></div><ul class="results"><li class="state loading">Preparing search index...</li><li class="state failure">The search index is not available</li></ul><a href="../index.html" class="title">Apache Arrow - v17.0.0-SNAPSHOT</a></div><div class="table-cell" id="tsd-widgets"><a href="#" class="tsd-widget tsd-toolbar-icon menu no-caption" data-toggle="menu" aria-label="Menu"><svg width="16" height="16" viewBox="0 0 16 16" fill="none"><use href="../assets/icons.svg#icon-menu"></use></svg></a></div></div></header><div class="container container-main"><div class="col-content"><div class="tsd-page-title"><ul class="tsd-breadcrumb"><li><a href="../index.html">Apache Arrow</a></li><li><a href="../modules/Arrow_dom.html">Arrow.dom</a></li><li><a href="Arrow_dom.MapRow.html">MapRow</a></li></ul><h1>Class MapRow&lt;K, V&gt;</h1></div> <section class="tsd-panel"><h4>Type Parameters</h4><ul class="tsd-type-parameter-list"><li><span><a id="K" class="tsd-anchor"></a><span class="tsd-kind-type-parameter">K</span><span class="tsd-signature-keyword"> extends </span><a href="Arrow_dom.DataType.html" class="tsd-signature-type tsd-kind-class">DataType</a> = <span class="tsd-signature-type">any</span></span></li><li><span><a id="V" class="tsd-anchor"></a><span class="tsd-kind-type-parameter">V</span><span class="tsd-signature-keyword"> extends </span><a href="Arrow_dom.DataType.html" class="tsd-signature-type tsd-kind-class">DataType</a> = <span class="tsd-signature-type">any</span></span></li></ul></section> <section class="tsd-panel"><h4 class="tsd-before-signature">Indexable</h4><div class="tsd-signature"><span class="tsd-signature-symbol">[</span>key: <span class="tsd-signature-type">string</span><span class="tsd-signature-symbol">]: </span><a class="tsd-signature-type tsd-kind-type-parameter" href="Arrow_dom.MapRow.html#constructor.new_MapRow.V-1">V</a><span class="tsd-signature-symbol">[</span><span class="tsd-signature-type">&quot;TValue&quot;</span><span class="tsd-signature-symbol">]</span></div></section><aside class="tsd-sources"><ul><li>Defined in <a href="https://github.com/apache/arrow/blob/3a54e68c69b028afe6d5fbb58eb0c4520dca1308/js/src/row/map.ts#L30">row/map.ts:30</a></li></ul></aside><section class="tsd-panel-group tsd-index-group"><section class="tsd-panel tsd-index-panel"><details class="tsd-index-content tsd-index-accordion" open><summary class="tsd-accordion-summary tsd-index-summary"><h5 class="tsd-index-heading uppercase" role="button" aria-expanded="false" tabIndex="0"><svg width="16" height="16" viewBox="0 0 16 16" fill="none"><use href="../assets/icons.svg#icon-chevronSmall"></use></svg> Index</h5></summary><div class="tsd-accordion-details"><section class="tsd-index-section"><h3 class="tsd-index-heading">Constructors</h3><div class="tsd-index-list"><a href="Arrow_dom.MapRow.html#constructor" class="tsd-index-link"><svg class="tsd-kind-icon" viewBox="0 0 24 24"><use href="../assets/icons.svg#icon-512"></use></svg><span>constructor</span></a>
</div></section><section class="tsd-index-section"><h3 class="tsd-index-heading">Accessors</h3><div class="tsd-index-list"><a href="Arrow_dom.MapRow.html#size" class="tsd-index-link"><svg class="tsd-kind-icon" viewBox="0 0 24 24"><use href="../assets/icons.svg#icon-262144"></use></svg><span>size</span></a>
</div></section><section class="tsd-index-section"><h3 class="tsd-index-heading">Methods</h3><div class="tsd-index-list"><a href="Arrow_dom.MapRow.html#_iterator_" class="tsd-index-link"><svg class="tsd-kind-icon" viewBox="0 0 24 24"><use href="../assets/icons.svg#icon-2048"></use></svg><span>[iterator]</span></a>
<a href="Arrow_dom.MapRow.html#toArray" class="tsd-index-link"><svg class="tsd-kind-icon" viewBox="0 0 24 24"><use href="../assets/icons.svg#icon-2048"></use></svg><span>to<wbr/>Array</span></a>
<a href="Arrow_dom.MapRow.html#toJSON" class="tsd-index-link"><svg class="tsd-kind-icon" viewBox="0 0 24 24"><use href="../assets/icons.svg#icon-2048"></use></svg><span>toJSON</span></a>
<a href="Arrow_dom.MapRow.html#toString" class="tsd-index-link"><svg class="tsd-kind-icon" viewBox="0 0 24 24"><use href="../assets/icons.svg#icon-2048"></use></svg><span>to<wbr/>String</span></a>
</div></section></div></details></section></section><section class="tsd-panel-group tsd-member-group"><h2>Constructors</h2><section class="tsd-panel tsd-member"><a id="constructor" class="tsd-anchor"></a><h3 class="tsd-anchor-link"><span>constructor</span><a href="#constructor" aria-label="Permalink" class="tsd-anchor-icon"><svg viewBox="0 0 24 24"><use href="../assets/icons.svg#icon-anchor"></use></svg></a></h3><ul class="tsd-signatures"><li class="tsd-signature tsd-anchor-link"><a id="constructor.new_MapRow" class="tsd-anchor"></a><span class="tsd-kind-constructor-signature">new <wbr/>Map<wbr/>Row</span><span class="tsd-signature-symbol">&lt;</span><a class="tsd-signature-type tsd-kind-type-parameter" href="Arrow_dom.MapRow.html#constructor.new_MapRow.K-1">K</a><span class="tsd-signature-symbol">, </span><a class="tsd-signature-type tsd-kind-type-parameter" href="Arrow_dom.MapRow.html#constructor.new_MapRow.V-1">V</a><span class="tsd-signature-symbol">&gt;</span><span class="tsd-signature-symbol">(</span><span class="tsd-kind-parameter">slice</span><span class="tsd-signature-symbol">)</span><span class="tsd-signature-symbol">: </span><a href="Arrow_dom.MapRow.html" class="tsd-signature-type tsd-kind-class">MapRow</a><span class="tsd-signature-symbol">&lt;</span><a class="tsd-signature-type tsd-kind-type-parameter" href="Arrow_dom.MapRow.html#constructor.new_MapRow.K-1">K</a><span class="tsd-signature-symbol">, </span><a class="tsd-signature-type tsd-kind-type-parameter" href="Arrow_dom.MapRow.html#constructor.new_MapRow.V-1">V</a><span class="tsd-signature-symbol">&gt;</span><a href="#constructor.new_MapRow" aria-label="Permalink" class="tsd-anchor-icon"><svg viewBox="0 0 24 24"><use href="../assets/icons.svg#icon-anchor"></use></svg></a></li><li class="tsd-description"><section class="tsd-panel"><h4>Type Parameters</h4><ul class="tsd-type-parameter-list"><li><span><a id="constructor.new_MapRow.K-1" class="tsd-anchor"></a><span class="tsd-kind-type-parameter">K</span><span class="tsd-signature-keyword"> extends </span><a href="Arrow_dom.DataType.html" class="tsd-signature-type tsd-kind-class">DataType</a><span class="tsd-signature-symbol">&lt;</span><a href="../enums/Arrow_dom.Type.html" class="tsd-signature-type tsd-kind-enum">Type</a><span class="tsd-signature-symbol">, </span><span class="tsd-signature-type">any</span><span class="tsd-signature-symbol">&gt;</span> = <span class="tsd-signature-type">any</span></span></li><li><span><a id="constructor.new_MapRow.V-1" class="tsd-anchor"></a><span class="tsd-kind-type-parameter">V</span><span class="tsd-signature-keyword"> extends </span><a href="Arrow_dom.DataType.html" class="tsd-signature-type tsd-kind-class">DataType</a><span class="tsd-signature-symbol">&lt;</span><a href="../enums/Arrow_dom.Type.html" class="tsd-signature-type tsd-kind-enum">Type</a><span class="tsd-signature-symbol">, </span><span class="tsd-signature-type">any</span><span class="tsd-signature-symbol">&gt;</span> = <span class="tsd-signature-type">any</span></span></li></ul></section><div class="tsd-parameters"><h4 class="tsd-parameters-title">Parameters</h4><ul class="tsd-parameter-list"><li><span><span class="tsd-kind-parameter">slice</span>: <a href="Arrow_dom.Data.html" class="tsd-signature-type tsd-kind-class">Data</a><span class="tsd-signature-symbol">&lt;</span><span class="tsd-signature-type">Struct</span><span class="tsd-signature-symbol">&lt;</span><span class="tsd-signature-symbol">{ </span><br/><span>    </span><span class="tsd-kind-property">key</span><span class="tsd-signature-symbol">: </span><a class="tsd-signature-type tsd-kind-type-parameter" href="Arrow_dom.MapRow.html#constructor.new_MapRow.K-1">K</a><span class="tsd-signature-symbol">; </span><br/><span>    </span><span class="tsd-kind-property">value</span><span class="tsd-signature-symbol">: </span><a class="tsd-signature-type tsd-kind-type-parameter" href="Arrow_dom.MapRow.html#constructor.new_MapRow.V-1">V</a><span class="tsd-signature-symbol">; </span><br/><span class="tsd-signature-symbol">}</span><span class="tsd-signature-symbol">&gt;</span><span class="tsd-signature-symbol">&gt;</span></span></li></ul></div><h4 class="tsd-returns-title">Returns <a href="Arrow_dom.MapRow.html" class="tsd-signature-type tsd-kind-class">MapRow</a><span class="tsd-signature-symbol">&lt;</span><a class="tsd-signature-type tsd-kind-type-parameter" href="Arrow_dom.MapRow.html#constructor.new_MapRow.K-1">K</a><span class="tsd-signature-symbol">, </span><a class="tsd-signature-type tsd-kind-type-parameter" href="Arrow_dom.MapRow.html#constructor.new_MapRow.V-1">V</a><span class="tsd-signature-symbol">&gt;</span></h4><aside class="tsd-sources"><ul><li>Defined in <a href="https://github.com/apache/arrow/blob/3a54e68c69b028afe6d5fbb58eb0c4520dca1308/js/src/row/map.ts#L38">row/map.ts:38</a></li></ul></aside></li></ul></section></section><section class="tsd-panel-group tsd-member-group"><h2>Accessors</h2><section class="tsd-panel tsd-member"><a id="size" class="tsd-anchor"></a><h3 class="tsd-anchor-link"><span>size</span><a href="#size" aria-label="Permalink" class="tsd-anchor-icon"><svg viewBox="0 0 24 24"><use href="../assets/icons.svg#icon-anchor"></use></svg></a></h3><ul class="tsd-signatures"><li class="tsd-signature" id="size.size-1"><span class="tsd-signature-keyword">get</span> size<span class="tsd-signature-symbol">(</span><span class="tsd-signature-symbol">)</span><span class="tsd-signature-symbol">: </span><span class="tsd-signature-type">number</span></li><li class="tsd-description"><h4 class="tsd-returns-title">Returns <span class="tsd-signature-type">number</span></h4><aside class="tsd-sources"><ul><li>Defined in <a href="https://github.com/apache/arrow/blob/3a54e68c69b028afe6d5fbb58eb0c4520dca1308/js/src/row/map.ts#L53">row/map.ts:53</a></li></ul></aside></li></ul></section></section><section class="tsd-panel-group tsd-member-group"><h2>Methods</h2><section class="tsd-panel tsd-member"><a id="_iterator_" class="tsd-anchor"></a><h3 class="tsd-anchor-link"><span>[iterator]</span><a href="#_iterator_" aria-label="Permalink" class="tsd-anchor-icon"><svg viewBox="0 0 24 24"><use href="../assets/icons.svg#icon-anchor"></use></svg></a></h3><ul class="tsd-signatures"><li class="tsd-signature tsd-anchor-link"><a id="_iterator_._iterator_-1" class="tsd-anchor"></a><span class="tsd-kind-call-signature">[iterator]</span><span class="tsd-signature-symbol">(</span><span class="tsd-signature-symbol">)</span><span class="tsd-signature-symbol">: </span><span class="tsd-signature-type">MapRowIterator</span><span class="tsd-signature-symbol">&lt;</span><a class="tsd-signature-type tsd-kind-type-parameter" href="Arrow_dom.MapRow.html#constructor.new_MapRow.K-1">K</a><span class="tsd-signature-symbol">, </span><a class="tsd-signature-type tsd-kind-type-parameter" href="Arrow_dom.MapRow.html#constructor.new_MapRow.V-1">V</a><span class="tsd-signature-symbol">&gt;</span><a href="#_iterator_._iterator_-1" aria-label="Permalink" class="tsd-anchor-icon"><svg viewBox="0 0 24 24"><use href="../assets/icons.svg#icon-anchor"></use></svg></a></li><li class="tsd-description"><h4 class="tsd-returns-title">Returns <span class="tsd-signature-type">MapRowIterator</span><span class="tsd-signature-symbol">&lt;</span><a class="tsd-signature-type tsd-kind-type-parameter" href="Arrow_dom.MapRow.html#constructor.new_MapRow.K-1">K</a><span class="tsd-signature-symbol">, </span><a class="tsd-signature-type tsd-kind-type-parameter" href="Arrow_dom.MapRow.html#constructor.new_MapRow.V-1">V</a><span class="tsd-signature-symbol">&gt;</span></h4><aside class="tsd-sources"><ul><li>Defined in <a href="https://github.com/apache/arrow/blob/3a54e68c69b028afe6d5fbb58eb0c4520dca1308/js/src/row/map.ts#L49">row/map.ts:49</a></li></ul></aside></li></ul></section><section class="tsd-panel tsd-member"><a id="toArray" class="tsd-anchor"></a><h3 class="tsd-anchor-link"><span>to<wbr/>Array</span><a href="#toArray" aria-label="Permalink" class="tsd-anchor-icon"><svg viewBox="0 0 24 24"><use href="../assets/icons.svg#icon-anchor"></use></svg></a></h3><ul class="tsd-signatures"><li class="tsd-signature tsd-anchor-link"><a id="toArray.toArray-1" class="tsd-anchor"></a><span class="tsd-kind-call-signature">to<wbr/>Array</span><span class="tsd-signature-symbol">(</span><span class="tsd-signature-symbol">)</span><span class="tsd-signature-symbol">: </span><span class="tsd-signature-type">unknown</span><span class="tsd-signature-symbol">[]</span><a href="#toArray.toArray-1" aria-label="Permalink" class="tsd-anchor-icon"><svg viewBox="0 0 24 24"><use href="../assets/icons.svg#icon-anchor"></use></svg></a></li><li class="tsd-description"><h4 class="tsd-returns-title">Returns <span class="tsd-signature-type">unknown</span><span class="tsd-signature-symbol">[]</span></h4><aside class="tsd-sources"><ul><li>Defined in <a href="https://github.com/apache/arrow/blob/3a54e68c69b028afe6d5fbb58eb0c4520dca1308/js/src/row/map.ts#L55">row/map.ts:55</a></li></ul></aside></li></ul></section><section class="tsd-panel tsd-member"><a id="toJSON" class="tsd-anchor"></a><h3 class="tsd-anchor-link"><span>toJSON</span><a href="#toJSON" aria-label="Permalink" class="tsd-anchor-icon"><svg viewBox="0 0 24 24"><use href="../assets/icons.svg#icon-anchor"></use></svg></a></h3><ul class="tsd-signatures"><li class="tsd-signature tsd-anchor-link"><a id="toJSON.toJSON-1" class="tsd-anchor"></a><span class="tsd-kind-call-signature">toJSON</span><span class="tsd-signature-symbol">(</span><span class="tsd-signature-symbol">)</span><span class="tsd-signature-symbol">: </span><span class="tsd-signature-symbol">{</span><br/><span>    </span><span class="tsd-signature-symbol">[</span><span class="tsd-kind-type-parameter">P</span><span class="tsd-signature-keyword"> in </span><span class="tsd-signature-type">any</span><span class="tsd-signature-symbol">]</span><span class="tsd-signature-symbol">: </span><a class="tsd-signature-type tsd-kind-type-parameter" href="Arrow_dom.MapRow.html#constructor.new_MapRow.V-1">V</a><span class="tsd-signature-symbol">[</span><span class="tsd-signature-type">&quot;TValue&quot;</span><span class="tsd-signature-symbol">]</span><br/><span class="tsd-signature-symbol">}</span><a href="#toJSON.toJSON-1" aria-label="Permalink" class="tsd-anchor-icon"><svg viewBox="0 0 24 24"><use href="../assets/icons.svg#icon-anchor"></use></svg></a></li><li class="tsd-description"><h4 class="tsd-returns-title">Returns <span class="tsd-signature-symbol">{</span><br/><span>    </span><span class="tsd-signature-symbol">[</span><span class="tsd-kind-type-parameter">P</span><span class="tsd-signature-keyword"> in </span><span class="tsd-signature-type">any</span><span class="tsd-signature-symbol">]</span><span class="tsd-signature-symbol">: </span><a class="tsd-signature-type tsd-kind-type-parameter" href="Arrow_dom.MapRow.html#constructor.new_MapRow.V-1">V</a><span class="tsd-signature-symbol">[</span><span class="tsd-signature-type">&quot;TValue&quot;</span><span class="tsd-signature-symbol">]</span><br/><span class="tsd-signature-symbol">}</span></h4><aside class="tsd-sources"><ul><li>Defined in <a href="https://github.com/apache/arrow/blob/3a54e68c69b028afe6d5fbb58eb0c4520dca1308/js/src/row/map.ts#L57">row/map.ts:57</a></li></ul></aside></li></ul></section><section class="tsd-panel tsd-member"><a id="toString" class="tsd-anchor"></a><h3 class="tsd-anchor-link"><span>to<wbr/>String</span><a href="#toString" aria-label="Permalink" class="tsd-anchor-icon"><svg viewBox="0 0 24 24"><use href="../assets/icons.svg#icon-anchor"></use></svg></a></h3><ul class="tsd-signatures"><li class="tsd-signature tsd-anchor-link"><a id="toString.toString-1" class="tsd-anchor"></a><span class="tsd-kind-call-signature">to<wbr/>String</span><span class="tsd-signature-symbol">(</span><span class="tsd-signature-symbol">)</span><span class="tsd-signature-symbol">: </span><span class="tsd-signature-type">string</span><a href="#toString.toString-1" aria-label="Permalink" class="tsd-anchor-icon"><svg viewBox="0 0 24 24"><use href="../assets/icons.svg#icon-anchor"></use></svg></a></li><li class="tsd-description"><h4 class="tsd-returns-title">Returns <span class="tsd-signature-type">string</span></h4><aside class="tsd-sources"><ul><li>Defined in <a href="https://github.com/apache/arrow/blob/3a54e68c69b028afe6d5fbb58eb0c4520dca1308/js/src/row/map.ts#L67">row/map.ts:67</a></li></ul></aside></li></ul></section></section></div><div class="col-sidebar"><div class="page-menu"><div class="tsd-navigation settings"><details class="tsd-index-accordion"><summary class="tsd-accordion-summary"><h3><svg width="20" height="20" viewBox="0 0 24 24" fill="none"><use 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class="tsd-index-accordion tsd-page-navigation"><summary class="tsd-accordion-summary"><h3><svg width="20" height="20" viewBox="0 0 24 24" fill="none"><use href="../assets/icons.svg#icon-chevronDown"></use></svg>On This Page</h3></summary><div class="tsd-accordion-details"><a href="#constructor" class=""><svg class="tsd-kind-icon" viewBox="0 0 24 24"><use href="../assets/icons.svg#icon-512"></use></svg><span>constructor</span></a><a href="#size" class=""><svg class="tsd-kind-icon" viewBox="0 0 24 24"><use href="../assets/icons.svg#icon-262144"></use></svg><span>size</span></a><a href="#_iterator_" class=""><svg class="tsd-kind-icon" viewBox="0 0 24 24"><use href="../assets/icons.svg#icon-2048"></use></svg><span>[iterator]</span></a><a href="#toArray" class=""><svg class="tsd-kind-icon" viewBox="0 0 24 24"><use href="../assets/icons.svg#icon-2048"></use></svg><span>to<wbr/>Array</span></a><a href="#toJSON" class=""><svg class="tsd-kind-icon" viewBox="0 0 24 24"><use href="../assets/icons.svg#icon-2048"></use></svg><span>toJSON</span></a><a href="#toString" class=""><svg class="tsd-kind-icon" viewBox="0 0 24 24"><use href="../assets/icons.svg#icon-2048"></use></svg><span>to<wbr/>String</span></a></div></details></div><div class="site-menu"><nav class="tsd-navigation"><a href="../index.html"><svg class="tsd-kind-icon" viewBox="0 0 24 24"><use href="../assets/icons.svg#icon-1"></use></svg><span>Apache Arrow - v17.0.0-SNAPSHOT</span></a><ul class="tsd-small-nested-navigation" id="tsd-nav-container" data-base=".."><li>Loading...</li></ul></nav></div></div></div><footer><p class="tsd-generator">Generated using <a href="https://typedoc.org/" target="_blank">TypeDoc</a></p></footer><div class="overlay"></div></body></html>