CODEWITHSUNDEEP
angulardictionarytypescript
Giora Guttsait
Giora Guttsait

Reputation: 1300

dictionary with a Type as a key typescript

I want to create a dictionary with Types as values.

f.e, in C#, i'd do: Dictionary<Type, WhateverINeed>, but in typescript there's really I know that can do that.

I've come across type.d.ts in @angulalr/core, but I don't know how to use it. I've seen the generic type class used the Route interface, where you provide the Component class for the route.

Basically, I want to create a map between a type and an Observable of that class

But the only dictionary key types I know can be used with Typescript's dictionary are int and string.

The usecase would be either:

service.method<MyClass>(...)

or

service.method(MyClass, ...)

Thanks for helping!

Upvotes: 1

Views: 5826

Answers (1)

kemsky
kemsky

Reputation: 15288

This is basically type safe wrapper for Map<,> and it will only work with concrete classes (functions):

import {Type} from '@angular/core';

class Service
{
    private map = new Map<Type<any>, Observable<any>>();

    public set<T>(key:Type<T>, value:Observable<T>):void
    {
        this.map.set(key, value);
    }

    public get<T>(key:Type<T>):Observable<T>
    {
        return this.map.get(key);
    }
}

const service = new Service();


service.set(MenuModel, Observable.of(new MenuModel()));
service.set(Number, Observable.of(0));

service.get(MenuModel).subscribe(model => console.debug('menu', model.userMenu));
service.get(Number).subscribe(model => console.debug('number', model));

Upvotes: 4

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