_ mixin to check for property in deep object

hasProps.js

_.mixin({
  hasProps: function (o, propPath) {
    var prop = propPath.split('.');
    for (var p=0; p<prop.length; p++) {
      if (!_.has(o, prop[p])) return false;
      o = o[prop[p]];
    }
    return true;
  }
});

// to test
var o = { a: { f: { k: {} } } };
_.hasProps(o,'a.f.k'); //returns true
_.hasProps(o,'a.b'); //returns false