code: function (f) {
      if (typeof f !== 'function')
        throw new Error('Deps.autorun requires a function argument');
  
      constructingComputation = true;
      var c = new Deps.Computation(f, Deps.currentComputation);
  
      if (Deps.active)
        Deps.onInvalidate(function () {
          c.stop();
        });
  
      return c;
    }
docs: http://docs.meteor.com/#deps_autorun  Run f(). Record its dependencies. Rerun it whenever the dependencies change.  Returns a new Computation, which is also passed to f.  Links the computation to the current computation so that it is stopped if the current computation is invalidated.