title: How can I read ‘native code’ JavaScript functions?
body: <p>Is there any way to see the declaration of JavaScript native code? Whenever I try to look at a native function in Chrome or Firefox, it says "<code>native code</code>":</p>
  
  <pre><code>&gt; String.fromCharCode
  function fromCharCode() { [native code] }
  </code></pre>
  
  <p>What does this mean, and is there any tool which can help me to read actual code?</p>