title: Can AppleScript now be replaced with JavaScript?
body: <p>I have a book on AppleScript that I'm wondering whether I should keep. I already know JavaScript.</p>
  
  <p>I understand that Apple added JavaScript scripting support into OS X recently.</p>
  
  <p>Does this mean that I don't have to learn AppleScript anymore to do scripting for OS X apps, or is it more to it than this? Your thoughts would be appreciated.</p>
  
  <p>The above question is from the perspective of the <strong>app user</strong> who wants to make the app do things automatically.</p>
  
  <p>How are things with respect to the <strong>app developers</strong> (Cocoa)? Can they get away with not learning AppleScript if they want to make their apps scriptable?</p>
  
  <p><strong>Update:</strong> Added bounty. Question rephrased (no disrespect meant towards AppleScript and its users): Given that I already know JavaScript, is there any good reason I should learn AppleScript anymore? Your detailed thoughts on this matter would be appreciated.</p>