What does _(variable_name) mean in javascript?
<p>I came across the following javascript code:</p>

<pre><code>this.removeEdge = function(source, target) {
  if(!_states[source]) return;

  var children = _states[source].children,
      index = _(children).indexOf(target);
  if(index !== -1) children.splice(index, 1);
};
</code></pre>

<p>What does _(children) mean?</p>
