How to convert an array into string literal union type in TypeScript? 编辑于 2023-09-06 14:59・中国香港 TypeScript ECMAScript JavaScript 赞同添加评论 分享喜欢收藏申请转载 写下你的评论... 还没有评论,发表第一个评论吧...
比如如果我们将上边示例中的 convertToUpperCase 函数使用 TypeScript 实现，那么就需要显示地标明 strOrArray 的类型就是 string 和 string[] 类型组成的联合类型，如下代码所示：{ const convertToUpperCase = (strOrArray: string | string[]) => { if (typeof strOrArray === 'string') { return strOrArr...
Tuple 可以 convert 去 Union (下面会教), 但是反过来就不行. 参考:这个和这个(主要原因是 Union 是没有顺序概念的, Tuple 却是有的,有去没有 ok,没有去有则不行) type MyArrayType = [string, number,boolean];//用 JS 来描述大概是这样const myArrayType = ['string', 'number', 'boolean']; 有...
代码如下:const jsonArr: object[] = [ { name: 'John', age: 25 }, { name: 'Jane', age: 30 }, { name: 'Bob', age: 35 } ]; function convertToJsonStringArray(jsonArr: object[]): string[] { return jsonArr.map((obj) => JSON.stringify(obj)); } const jsonStringArr: str...
return Convert.ToInt32(res); } catch (OverflowException) { return res.Contains('-') ? int.MinValue : int.MaxValue; } catch (FormatException) { return 0; } } private static string GetMaxStr(char[] charArr, int start = 0)
1.将字符串转为byte数组 string imgData = “….,…,….,….”; string [] imgArr=imgData.Split(new char[]{‘,’}); byte[]...bty = Array.ConvertAll(imgArr, delegate(string s) { return byte.Parse(s); }); 2.将byte数组转为字符串主要两个主要方法...: String.Join(): 在指定 String...
// baz?: boolean; // }; 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 13. 14. 参考 Convert array of strings to TypeScript type Typescript: derive union type from array of objects Typescript derive union type from tuple/array values...
下面我们来看看它的实现：/** * Convert string literal type to uppercase */ type Uppercase<S...
class AccountingDepartment extends Department implements ReportingDepartment { name: string; printName(): void { console.log("Department name: " + this.name); } } Introduce a constant In the editor, select the expression to convert into a constant and press CtrlAlt0C or select Refactor |...
foo = bar; // error: Type 'bigint' is not assignable to type 'number'. bar = foo; // error: Type 'number' is not assignable to type 'bigint'. As specified in ECMAScript, mixing numbers and bigints in arithmetic operations is an error. You'll have to explicitly convert values to...