README - Type Challenges

<h1>Readonly 2 </h1><blockquote><p>by Anthony Fu <a href="https://github.com/antfu" target="_blank">@antfu</a></p></blockquote><p><a href="https://tsch.js.org/8/play" target="_blank"></a>    <a href="./README.zh-CN.md" target="_blank"></a> <a href="./README.ja.md" target="_blank"></a> <a href="./README.ko.md" target="_blank"></a> <a href="./README.pt-BR.md" target="_blank"></a> </p>

Implement a generic MyReadonly2<T, K> which takes two type argument T and K.

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

For example

interface Todo {
  title: string
  description: string
  completed: boolean
}

const todo: MyReadonly2<Todo, 'title' | 'description'> = {
  title: "Hey",
  description: "foobar",
  completed: false,
}

todo.title = "Hello" // Error: cannot reassign a readonly property
todo.description = "barFoo" // Error: cannot reassign a readonly property
todo.completed = true // OK

<a href="../../README.md" target="_blank"></a> <a href="https://tsch.js.org/8/answer" target="_blank"></a> <a href="https://tsch.js.org/8/solutions" target="_blank"></a> <hr><h3>Related Challenges</h3><a href="https://github.com/type-challenges/type-challenges/blob/main/questions/00007-easy-readonly/README.md" target="_blank"></a> <a href="https://github.com/type-challenges/type-challenges/blob/main/questions/00009-medium-deep-readonly/README.md" target="_blank"></a>