Question

如何将字符串数组string[]映射到带有字符串[string, string]的二维数组？

我尝试过

const animals: string[] = ['Dog', 'Cat', 'Mouse'];
// This throws an error
let splittedArray: [string, string] = animals.slice(0,2);

// This doesn't throw an error
// let splittedArray: [string, string] = ['Dog', 'Cat'];

// Error Message
// Type 'string[]' is missing the following properties from type '[string, string]': 0, 1 ts(2739)

我想要的输出应该是：

console.log(splittedArray);
// ['Dog', 'Cat']

Answer 1

您要2D数组还是2个元素的数组？这似乎适合您的输出：

    const animals: string[] = ['Dog', 'Cat', 'Mouse'];
    let splittedArray: string[] = animals.slice(0,2);

Answer 2

只需将类型声明更改为此... as运算符主要是为*.tsx文件设计的，以避免语法不明确。工作StackBlitz Link is

const animals: string[] = ['Dog', 'Cat', 'Mouse'];
let splittedArray = animals.slice(0,2) as [string,string];
console.log(splittedArray)

打字稿：将string []映射到[string，string]

2 个答案: