safeLookup of a JSON inflated object along a path

gistfile1.js

function safeLookup(obj, propPath, fallback) {
  fallback = fallback || '';

  var props = propPath.split('.');

  // Descend obj along the path specified in propPath, but                                                                                        
  // don't trust that that path is good, and may contain                                                                                          
  // undefined routes.                                                                                                                            
  try {
    props.forEach(function(prop) {
      obj = obj[prop];
    });
    return obj || fallback;
  } catch (e) {
    return fallback;
  }
}