ktyr report

型

type Order = {
    readonly id : number;
    title : string;
    price : number;
};

　
変数

const firstOrder : Order = {
    id : 2,
    title : "あいうえお",
    price : 512,
};

　
変更OK

firstOrder.title = "かきくけこ";

　
変更NG

firstOrder.id = 3;