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<title>transform() | collect.js</title>
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The items in the collection will be replaced by the values returned by the callback:</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 number">1</span><span class="token punctuation">,</span> <span class="token number">2</span><span class="token punctuation">,</span> <span class="token number">3</span><span class="token punctuation">,</span> <span class="token number">4</span><span class="token punctuation">,</span> <span class="token number">5</span><span class="token punctuation">]</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
collection<span class="token punctuation">.</span><span class="token function">transform</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 operator">*</span> <span class="token number">2</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
collection<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">//=&gt; [2, 4, 6, 8, 10]</span>
</code></pre></div><blockquote><p>Unlike most other collection methods, <code>transform</code> modifies the collection itself. If you wish to create a new collection instead, use the <code>map</code> method.</p></blockquote> <p><a href="https://github.com/ecrmnn/collect.js/blob/master/src/methods/transform.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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