Matsumoto Yukihiro (Matz) is the author of the programming language Ruby. He says about how he read the source codes:
<ul>
<li>Do not try to read the whole codes.<ul>
<li>There is no &quot;story&quot; in the source code, so you do not need to <a href="/en/read%20through">read through</a> it all. It is enough if you pinch interesting fragments and learn the wisdom of the predecessors.</li>
</ul>
</li>
<li>Read with purpose.<ul>
<li>If you read the source code to learn some particular thing, you can effectively understand and acquire knowledge.
<a href="/en/Original%20Matz's%20talk%20in%20Japanese">Original Matz&#39;s talk in Japanese</a></li>
</ul>
</li>
</ul>
In other words, you should better to have a particular purpose, and <a href="/en/cherry-pick">cherry-pick</a> interesting <a href="/en/fragment">fragment</a>s from the codes.
I introduced the three ideas of <a href="/en/lazy%20evaluation%20study%20method">lazy evaluation study method</a>, <a href="/en/YAGNI%20principle">YAGNI principle</a> and <a href="/en/Matz's%20code%20reading%20method">Matz&#39;s code reading method</a>. You may find <a href="/en/common%20pattern">common pattern</a>s among the three ideas.
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(1.3.1.3) How Matz read source codes