TypeScript中數組類型的定義

一般數組類型的定義

// 類型推斷
const numberArr = [1, 2, 3];
// 類型注釋
const numberArr: number[] = [1, 2, 3];
const stringArr: string[] = ["a", "b", "c"];
const undefinedArr: undefined[] = [undefined, undefined];
// 存在多種類型
const arr: (number | string)[] = [1, "string", 2];

數組中對象類型的定義

const xiaoJieJies: { name: string, age: Number }[] = [
  { name: "劉英", age: 18 },
  { name: "謝大腳", age: 28 },
];

// 使用 type 類型別名定義
type Lady = { name: string, age: Number };

const xiaoJieJies: Lady[] = [
  { name: "劉英", age: 18 },
  { name: "謝大腳", age: 28 },
];

// 使用 class 類定義
class Madam {
  name: string;
  age: number;
}

const xiaoJieJies: Madam[] = [
  { name: "劉英", age: 18 },
  { name: "謝大腳", age: 28 },
];

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參考：
技術胖——TypeScript從入門到精通（06. TypeScript中數組類型的定義）