[英]How to declare an object of arrays of custom type in typescript
I am searching how to declare a variable where I can store users by birthdate while avoiding using any我正在搜索如何声明一个变量,我可以在其中按生日存储用户,同时避免使用任何
let formatedUsers = {} as "TYPE_NEEDED"
for (let i = 0; i < users.length; i++) {
const user= users[i];
if (!formatedUsers[user.birthdate]) formatedUsers[user.birthdate] = [];
formatedUsers[user.birthdate].push(user);
}
In the end I want my variable "formatedUsers" to be like this:最后我希望我的变量“formatedUsers”是这样的:
formatedUsers = {
12-02-1996: [user1, user3, user4],
02-04-1998: [user2],
05-08-1999: [user5, user6]
}
The object keys are strings, and the object values are arrays of users, so a relatively simple Record will do it. object键是字符串,object值是用户的arrays,所以一个比较简单的Record就可以了。 Assuming you have a reference to the type of user
, you can do:假设您有对user
类型的引用,您可以执行以下操作:
const formattedUsers: Record<string, User[]> = [];
If you don't have a reference to the user type, you can extract it first.如果您没有对用户类型的引用,您可以先提取它。
type User = (typeof users)[number];
In that case, you can use the Record interface.在这种情况下,您可以使用 Record 接口。
let formatedUsers: Record<number, User[]> = {0:[]};
You can also initialize the value like that.您也可以像这样初始化值。
This is more accurate since it requires keys to be number-number-number
这更准确,因为它要求键是number-number-number
const formattedUsers: Record<`${number}-${number}-${number}`, User[]> = {};
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