gistfile1.js

function getCarsByBodyStyle( allModels, allBodyStyles, selectedBodyStyles ){
  var cars = [];
  var excludedBodyStyles = _.without.apply( this, [allBodyStyles].concat(selectedBodyStyles) );

  _.each(allModels, function(model){
    if( _.intersect(  model.bodyTypes, excludedBodyStyles ).length == 0 ){
      cars.push( parseInt( model.id ) );
    }
  });
    
  return cars;
}