title: Why does Ruby use respond_to? instead of responds_to?
body: <p>I'm curious why Ruby's introspection related method to check if an object responds to a method is <code>respond_to?</code> instead of <code>responds_to?</code></p>
  
  <p>It always seems awkward to me but maybe that's because I'm used to <code>respondsToSelector</code> in objective-c.</p>