behaviourSubject in angular2 , how it works and how to use it
<p>I am trying to build a shared service as follow</p>

<pre><code>import {Injectable,EventEmitter}     from 'angular2/core';
import {Subject} from 'rxjs/Subject';
import {BehaviorSubject} from 'rxjs/subject/BehaviorSubject';
@Injectable()
export class SearchService {

    public country = new Subject&lt;SharedService&gt;();
    public space: Subject&lt;SharedService&gt; = new BehaviorSubject&lt;SharedService&gt;(null);
    searchTextStream$ = this.country.asObservable();

    broadcastTextChange(text: SharedService) {
        this.space.next(text);
        this.country.next(text);
    }
}
export class SharedService {
    country: string;
    state: string;
    city: string;  
    street: string;
}
</code></pre>

<p>I don't know how to implement BehaviourSubject  basically what I am trying here is just a mess I guess  and I am calling this value in child component by using</p>

<pre><code>console.log('behiob' + shared.space.single());
</code></pre>

<p>which is throwing an error as .single()/last() etc whatever is available is not a function so can someone show me how it actually works and how to implement it as I searched for the examples but none is making sense to me.</p>