javascript - having problems setting a member variable on an ng2 component -


i'm having problems setting member variable on ng2 component. in component below, i'm trying set service results member variable. updatesearchresults1() sets member variable expected updatesearchresults2 delegates promise processsearchresults returns error: "typeerror: cannot set property 'blogpostlistitems' of null." understanding these 2 implementations functionally same. why can set this.blogpostlistitems updatesearchresults1() whereas error this.blogpostlistitems null updatesearchresults2()?

import { component, oninit, viewchild, elementref } '@angular/core'; import { router } '@angular/router'; import { blogservice } '../../services/blog.service'; import { bloglanding } '../../entities/blog-landing'; import { response } '@angular/http';  @component({     selector: 'blog-landing',     templateurl: '../../../ng2/templates/blog-landing.component.html' })  export class bloglandingcomponent implements oninit {     @viewchild('ddlauthor') ddlauthor;     bloglanding: bloglanding;     blogpostlistitems: array<object>;      constructor(         private router: router,         private blogservice: blogservice){}      ngoninit(): void     {     }      updatesearchresults1()     {         this.blogservice             .getblogposts()             .then(blogpostlistitems => this.blogpostlistitems = blogpostlistitems)     }      updatesearchresults2()     {         this.blogservice             .getblogposts()             .then(this.processsearchresults);     }      processsearchresults(responseobject)     {         this.blogpostlistitems = responseobject;     }  }


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