README - Type Challenges

<h1>PartialByKeys </h1><blockquote><p>by jiangshan <a href="https://github.com/jiangshanmeta" target="_blank">@jiangshanmeta</a></p></blockquote><p><a href="https://tsch.js.org/2757/play" target="_blank"></a>    <a href="./README.zh-CN.md" target="_blank"></a> <a href="./README.ko.md" target="_blank"></a> </p>

Implement a generic PartialByKeys<T, K> which takes two type argument T and K.

K specify the set of properties of T that should set to be optional. When K is not provided, it should make all properties optional just like the normal Partial<T>.

For example

typescript

interface User {
  name: string
  age: number
  address: string
}

type UserPartialName = PartialByKeys<User, 'name'> // { name?:string; age:number; address:string }