murtaugh

<figure class="quote">
	<blockquote>It is the unofficial force—the Baker Street irregulars.</blockquote>
</figure>

nathansmith

// Check existence
function exists(thing) {
  return (!isNaN(thing) && typeof thing !== 'undefined' && thing !== null) ? thing : undefined;
}

// Or, more tersely
function exists(thing) {
  // != checks `null` and `undefined`
  return thing != null ? thing : undefined;
}