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117 lines
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117 lines
29 KiB
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class="sidebar-link">transform()</a></li><li><a href="/<REPO>/api/union.html" class="sidebar-link">union()</a></li><li><a href="/<REPO>/api/unique.html" class="sidebar-link">unique()</a></li><li><a href="/<REPO>/api/unless.html" class="sidebar-link">unless()</a></li><li><a href="/<REPO>/api/unlessEmpty.html" class="sidebar-link">unlessEmpty()</a></li><li><a href="/<REPO>/api/unlessNotEmpty.html" class="sidebar-link">unlessNotEmpty()</a></li><li><a href="/<REPO>/api/unwrap.html" class="sidebar-link">unwrap()</a></li><li><a href="/<REPO>/api/values.html" class="sidebar-link">values()</a></li><li><a href="/<REPO>/api/when.html" class="sidebar-link">when()</a></li><li><a href="/<REPO>/api/whenEmpty.html" class="sidebar-link">whenEmpty()</a></li><li><a href="/<REPO>/api/whenNotEmpty.html" class="sidebar-link">whenNotEmpty()</a></li><li><a href="/<REPO>/api/where.html" class="sidebar-link">where()</a></li><li><a href="/<REPO>/api/whereBetween.html" class="sidebar-link">whereBetween()</a></li><li><a href="/<REPO>/api/whereIn.html" class="sidebar-link">whereIn()</a></li><li><a href="/<REPO>/api/whereInstanceOf.html" class="sidebar-link">whereInstanceOf()</a></li><li><a href="/<REPO>/api/whereNotBetween.html" class="sidebar-link">whereNotBetween()</a></li><li><a href="/<REPO>/api/whereNotIn.html" class="sidebar-link">whereNotIn()</a></li><li><a href="/<REPO>/api/wrap.html" class="sidebar-link">wrap()</a></li><li><a href="/<REPO>/api/zip.html" class="sidebar-link">zip()</a></li></ul></section></li></ul> </aside> <main class="page"> <div class="theme-default-content content__default"><h1 id="groupby"><a href="#groupby" aria-hidden="true" class="header-anchor">#</a> <code>groupBy()</code></h1> <p>The groupBy method groups the collection's items by a given key:</p> <div class="language-js extra-class"><pre class="language-js"><code><span class="token keyword">const</span> collection <span class="token operator">=</span> <span class="token function">collect</span><span class="token punctuation">(</span><span class="token punctuation">[</span>
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<span class="token punctuation">{</span>
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product<span class="token punctuation">:</span> <span class="token string">"Chair"</span><span class="token punctuation">,</span>
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manufacturer<span class="token punctuation">:</span> <span class="token string">"IKEA"</span>
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<span class="token punctuation">}</span><span class="token punctuation">,</span>
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<span class="token punctuation">{</span>
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product<span class="token punctuation">:</span> <span class="token string">"Desk"</span><span class="token punctuation">,</span>
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manufacturer<span class="token punctuation">:</span> <span class="token string">"IKEA"</span>
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<span class="token punctuation">}</span><span class="token punctuation">,</span>
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<span class="token punctuation">{</span>
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product<span class="token punctuation">:</span> <span class="token string">"Chair"</span><span class="token punctuation">,</span>
|
|
manufacturer<span class="token punctuation">:</span> <span class="token string">"Herman Miller"</span>
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<span class="token punctuation">}</span>
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<span class="token punctuation">]</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
|
|
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<span class="token keyword">const</span> grouped <span class="token operator">=</span> collection<span class="token punctuation">.</span><span class="token function">groupBy</span><span class="token punctuation">(</span><span class="token string">"manufacturer"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
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|
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grouped<span class="token punctuation">.</span><span class="token function">all</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
|
|
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|
<span class="token comment">//=> {</span>
|
|
<span class="token comment">//=> IKEA: [</span>
|
|
<span class="token comment">//=> {</span>
|
|
<span class="token comment">//=> id: 100,</span>
|
|
<span class="token comment">//=> product: 'Chair',</span>
|
|
<span class="token comment">//=> manufacturer: 'IKEA',</span>
|
|
<span class="token comment">//=> price: '1490 NOK',</span>
|
|
<span class="token comment">//=> },</span>
|
|
<span class="token comment">//=> {</span>
|
|
<span class="token comment">//=> id: 150,</span>
|
|
<span class="token comment">//=> product: 'Desk',</span>
|
|
<span class="token comment">//=> manufacturer: 'IKEA',</span>
|
|
<span class="token comment">//=> price: '900 NOK',</span>
|
|
<span class="token comment">//=> },</span>
|
|
<span class="token comment">//=> ],</span>
|
|
<span class="token comment">//=> 'Herman Miller': [</span>
|
|
<span class="token comment">//=> {</span>
|
|
<span class="token comment">//=> id: 200,</span>
|
|
<span class="token comment">//=> product: 'Chair',</span>
|
|
<span class="token comment">//=> manufacturer: 'Herman Miller',</span>
|
|
<span class="token comment">//=> price: '9990 NOK',</span>
|
|
<span class="token comment">//=> },</span>
|
|
<span class="token comment">//=> ]</span>
|
|
<span class="token comment">//=> }</span>
|
|
</code></pre></div><p>In addition to passing a string key, you may also pass a callback. The callback should return the value you wish to key the group by:</p> <div class="language-js extra-class"><pre class="language-js"><code><span class="token keyword">const</span> collection <span class="token operator">=</span> <span class="token function">collect</span><span class="token punctuation">(</span><span class="token punctuation">[</span>
|
|
<span class="token punctuation">{</span>
|
|
product<span class="token punctuation">:</span> <span class="token string">"Chair"</span><span class="token punctuation">,</span>
|
|
manufacturer<span class="token punctuation">:</span> <span class="token string">"IKEA"</span>
|
|
<span class="token punctuation">}</span><span class="token punctuation">,</span>
|
|
<span class="token punctuation">{</span>
|
|
product<span class="token punctuation">:</span> <span class="token string">"Desk"</span><span class="token punctuation">,</span>
|
|
manufacturer<span class="token punctuation">:</span> <span class="token string">"IKEA"</span>
|
|
<span class="token punctuation">}</span><span class="token punctuation">,</span>
|
|
<span class="token punctuation">{</span>
|
|
product<span class="token punctuation">:</span> <span class="token string">"Chair"</span><span class="token punctuation">,</span>
|
|
manufacturer<span class="token punctuation">:</span> <span class="token string">"Herman Miller"</span>
|
|
<span class="token punctuation">}</span>
|
|
<span class="token punctuation">]</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
|
|
|
|
<span class="token keyword">const</span> grouped <span class="token operator">=</span> collection<span class="token punctuation">.</span><span class="token function">groupBy</span><span class="token punctuation">(</span><span class="token keyword">function</span><span class="token punctuation">(</span><span class="token parameter">item<span class="token punctuation">,</span> key</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
|
|
<span class="token keyword">return</span> item<span class="token punctuation">.</span>manufacturer<span class="token punctuation">.</span><span class="token function">substring</span><span class="token punctuation">(</span><span class="token number">0</span><span class="token punctuation">,</span> <span class="token number">3</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
|
|
<span class="token punctuation">}</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
|
|
|
|
grouped<span class="token punctuation">.</span><span class="token function">all</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
|
|
|
|
<span class="token comment">//=> {</span>
|
|
<span class="token comment">//=> IKE: [</span>
|
|
<span class="token comment">//=> {</span>
|
|
<span class="token comment">//=> id: 100,</span>
|
|
<span class="token comment">//=> product: 'Chair',</span>
|
|
<span class="token comment">//=> manufacturer: 'IKEA',</span>
|
|
<span class="token comment">//=> price: '1490 NOK',</span>
|
|
<span class="token comment">//=> },</span>
|
|
<span class="token comment">//=> {</span>
|
|
<span class="token comment">//=> id: 150,</span>
|
|
<span class="token comment">//=> product: 'Desk',</span>
|
|
<span class="token comment">//=> manufacturer: 'IKEA',</span>
|
|
<span class="token comment">//=> price: '900 NOK',</span>
|
|
<span class="token comment">//=> },</span>
|
|
<span class="token comment">//=> ],</span>
|
|
<span class="token comment">//=> Her: [</span>
|
|
<span class="token comment">//=> {</span>
|
|
<span class="token comment">//=> id: 200,</span>
|
|
<span class="token comment">//=> product: 'Chair',</span>
|
|
<span class="token comment">//=> manufacturer: 'Herman Miller',</span>
|
|
<span class="token comment">//=> price: '9990 NOK',</span>
|
|
<span class="token comment">//=> },</span>
|
|
<span class="token comment">//=> ]</span>
|
|
<span class="token comment">//=> }</span>
|
|
</code></pre></div><p><a href="https://github.com/ecrmnn/collect.js/blob/master/src/methods/groupBy.js" target="_blank" rel="noopener noreferrer">View source on GitHub<svg xmlns="http://www.w3.org/2000/svg" aria-hidden="true" x="0px" y="0px" viewBox="0 0 100 100" width="15" height="15" class="icon outbound"><path fill="currentColor" d="M18.8,85.1h56l0,0c2.2,0,4-1.8,4-4v-32h-8v28h-48v-48h28v-8h-32l0,0c-2.2,0-4,1.8-4,4v56C14.8,83.3,16.6,85.1,18.8,85.1z"></path> <polygon fill="currentColor" points="45.7,48.7 51.3,54.3 77.2,28.5 77.2,37.2 85.2,37.2 85.2,14.9 62.8,14.9 62.8,22.9 71.5,22.9"></polygon></svg></a></p></div> <footer class="page-edit"><!----> <!----></footer> <div class="page-nav"><p class="inner"><span class="prev">
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