arrays - 如何在 TypeScript 中向对象数组添加具有不同值的新属性？

Question

示例:

equipment: object[] = [
       {name: 'Duct Tape', mass: 0.5},
       {name: 'Space Camera', mass: 20},
       {name: 'Food', mass: 150},
       {name: 'Oxygen Tanks', mass: 400},
             ];

我想要的对象是

equipmentItems: object[] = [
       {name: 'Duct Tape', mass: 0.5 , age = 25},
       {name: 'Space Camera', mass: 20 , age = 30},
       {name: 'Food', mass: 150 , age = 35},
       {name: 'Oxygen Tanks', mass: 400 , age = 40}
      ]

我知道我可以循环添加属性，例如

for(let i=0;i<equipments.length;i++){
  let equipments[i].age=25;
}

但这将使所有装备的年龄增加25。有没有快速的方法来做到这一点？

Answer 1

使用计数器来保存年龄值，并在每次迭代中递增它，以及扩展运算符:

let counter = 20;
this.equipment = this.equipment.map(e => {
  return {
    ...e,
    age: counter += 5,
  };
});

---

此外，由于我们使用 typescript 创建一个接口(interface)来表示设备，即

export interface Items {
  name: string;
  mass: number;
  age?: number;      // optional since it is added later
}

现在使用以下方法定义数组:

equipment: Items[] = [
  { name: 'Duct Tape', mass: 0.5 },
  { name: 'Space Camera', mass: 20 },
  { name: 'Food', mass: 150 },
  { name: 'Oxygen Tanks', mass: 400 },
];