title: Where can I see the source code for JavaScript methods, such as hasOwnProperty, in Node.js?
body: <p>I have been studying JavaScript algorithms and Big O for interviews. I was told that knowing the runtimes of built-in methods, such as <code>Object.prototype.hasOwnProperty</code> and <code>Array.prototype.map</code>, is important. </p>
  
  <p>What is a simple way to view the source code for these functions in node.js? I have a local copy of node.js, and I tried to search for these methods in my text editor, but it's not as straightforward as I thought.    </p>