# 在 ts 中如何实现 Partial
更多描述
实现 Partial，使得 Object 所有的属性变为可选属性。
PS:
Partial已经在 TS 中原生实现，见文档: https://www.typescriptlang.org/docs/handbook/utility-types.html#partialtype (opens new window)
type User = {
id: number;
age: number;
name: string;
};
// Output:
// type PartialUser = {
// id?: number | undefined;
// age?: number | undefined;
// name?: string | undefined;
// }
type PartialUser = Partial<User>;
以下是使用案例
interface Todo {
title: string;
description: string;
}
function updateTodo(todo: Todo, fieldsToUpdate: Partial<Todo>) {
return { ...todo, ...fieldsToUpdate };
}
const todo1 = {
title: "organize desk",
description: "clear clutter",
};
const todo2 = updateTodo(todo1, {
description: "throw out trash",
});
Issue
欢迎在 Gtihub Issue 中回答此问题: Issue 714 (opens new window)
Author
type Partial<T> = {
[P in keyof T]?: T[P];
};