learnyounode
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Learn You The Node.js For Much Win! An intro to Node.js via a set of self-guided workshops.
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<div class="body-content"><h1 id="concat-stream">concat-stream</h1>
<div class="highlight"><pre><span class="nv">$ </span>npm install concat-stream
</pre></div>
<p>then</p>
<div class="highlight"><pre><span class="kd">var</span> <span class="nx">concat</span> <span class="o">=</span> <span class="nx">require</span><span class="p">(</span><span class="s1">'concat-stream'</span><span class="p">)</span>
<span class="kd">var</span> <span class="nx">fs</span> <span class="o">=</span> <span class="nx">require</span><span class="p">(</span><span class="s1">'fs'</span><span class="p">)</span>
<span class="kd">var</span> <span class="nx">read</span> <span class="o">=</span> <span class="nx">fs</span><span class="p">.</span><span class="nx">createReadStream</span><span class="p">(</span><span class="s1">'readme.md'</span><span class="p">)</span>
<span class="kd">var</span> <span class="nx">write</span> <span class="o">=</span> <span class="nx">concat</span><span class="p">(</span><span class="kd">function</span><span class="p">(</span><span class="nx">data</span><span class="p">)</span> <span class="p">{})</span>
<span class="nx">read</span><span class="p">.</span><span class="nx">pipe</span><span class="p">(</span><span class="nx">write</span><span class="p">)</span>
</pre></div>
<p>works with arrays too!</p>
<div class="highlight"><pre><span class="kd">var</span> <span class="nx">write</span> <span class="o">=</span> <span class="nx">concat</span><span class="p">(</span><span class="kd">function</span><span class="p">(</span><span class="nx">data</span><span class="p">)</span> <span class="p">{})</span>
<span class="nx">write</span><span class="p">.</span><span class="nx">write</span><span class="p">([</span><span class="mi">1</span><span class="p">,</span><span class="mi">2</span><span class="p">,</span><span class="mi">3</span><span class="p">])</span>
<span class="nx">write</span><span class="p">.</span><span class="nx">write</span><span class="p">([</span><span class="mi">4</span><span class="p">,</span><span class="mi">5</span><span class="p">,</span><span class="mi">6</span><span class="p">])</span>
<span class="nx">write</span><span class="p">.</span><span class="nx">end</span><span class="p">()</span>
<span class="c1">// data will be [1,2,3,4,5,6] in the above callback</span>
</pre></div>
<p>works with buffers too! can't believe the deals!</p>
<div class="highlight"><pre><span class="kd">var</span> <span class="nx">write</span> <span class="o">=</span> <span class="nx">concat</span><span class="p">(</span><span class="kd">function</span><span class="p">(</span><span class="nx">data</span><span class="p">)</span> <span class="p">{})</span>
<span class="nx">write</span><span class="p">.</span><span class="nx">write</span><span class="p">(</span><span class="k">new</span> <span class="nx">Buffer</span><span class="p">(</span><span class="s1">'hello '</span><span class="p">))</span>
<span class="nx">write</span><span class="p">.</span><span class="nx">write</span><span class="p">(</span><span class="k">new</span> <span class="nx">Buffer</span><span class="p">(</span><span class="s1">'world'</span><span class="p">))</span>
<span class="nx">write</span><span class="p">.</span><span class="nx">end</span><span class="p">()</span>
<span class="c1">// data will be a buffer that toString()s to 'hello world' in the above callback</span>
</pre></div>
<p>MIT LICENSE</p>
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