pick.js

function pick(collection, properties){
  [].map.call(collection, function(val, key){
    var result = {};
    properties.forEach(copyProperty);
    return result;

    function copyProperty(propName){ result[propName] = val[propName]; }
  })
}

pick([{name:'justin', id:1}], ['name']);
// produces => [{name:'justin'}]