変数のカプセル化

refactorgram

let defaultOwner = {firstName: "Martin", lastName: "Fowler"};

let defaultOwnerData = {firstName: "Martin", lastName: "Fowler"};
export function defaultOwner()       {return defaultOwnerData;}
export function setDefaultOwner(arg) {defaultOwnerData = arg;}

エイリアス フィールドのセルフカプセル化、フィールドのカプセル化