ts重点学习90-条件类型笔记

Posted 2022-10-02

export default 

// 1.条件类型基本使用
// type MyType<T> = T extends string ? string : any;
// type res = MyType<boolean>


// 2.函数重载
// interface IName 
//   name: string;
// 

// interface IAge 
//   age: number;
// 

// function reLoad(name: string): IName;
// function reLoad(age: number): IAge;
// function reLoad(nameorAge: string | number): IName | IAge;

// function reLoad(nameorAge: string | number): IName | IAge 
//   throw ""
// 


// 3.条件类型优化函数重载
interface IName 
  name: string;


interface IAge 
  age: number;



type Condition<T> = T extends string ? IName : IAge;

function reLoad<T extends number | string>(nameOrAge: T): Condition<T> 
  throw ""



reLoad("王丽坤");
reLoad(100);