Is it possible to do something like this in TypeScript?
interface IPerson {
name: string;
age: number;
}
declare class Map<T> {
get(name: keyof T): any // ? return type
}
Result I need
const map = new Map<IPerson>();
map.get("name"); // string
map.get("age"); // number
Let the name parameter be a generic that extends keyof T, and then your return type can use that to index T to get the right type. EG:
interface IPerson {
name: string;
age: number;
}
declare class MyMap<T> {
get<K extends keyof T>(name: K): T[K]
}
// Result I need
const map = new MyMap<IPerson>();
map.get("name"); // string
map.get("age"); // number
P.S. Consider naming your class something other than Map, since it will be easily confused with the built-in javascript Map object, and will conflict with TypeScript's built-in types for Map if present.
Map<string, IPerson>.keyof T, and each Value has type defined in incoming object type and depending of Key