Angular2 - How to read params out of the current url

Lets say we want to take `id` param out of the current url. To do so we need to obtain current route by injecting "ActivatedRoute" object and read its params.

    constructor(private _route: ActivatedRoute){
        this.id = _route.params.map(param => param.id);
    }

The `id` field will be of Observable type.