使用接口的键索引 object 而值是具有该键的返回类型的 function

Question

Here's what I have as an interface:

interface Person{
    name: string
    age: number
    hobbies: string[]
}



const processors : {[functioname: keyof Person}: (value: string)=> Person[fuctionname]} =
{
    name: (value)=>{}//must return string
    age: (value)=>{}//must return a number
}

I want the processors to be funcitons indexed by the key and return a value of the same type

so if the key is name, the return type should be string like in the interface

Answer 1

You need to use Type[key] construction.

Here is an example, pay attention to the type Proc<T>

interface Person{
    name: string
    age: number
    hobbies: string[]
}


type Proc<T> = {
    [key in keyof T]: ()=> T[key]
}

const processors : Proc<Person> =
{
    name: ()=>'',//must return string
    age: ()=>5,//must return a number
    hobbies: ()=> []
}