Angular 2 custom pipe for full address - Address is extracted from the Address Object

full-address.ts

import {Pipe, PipeTransform} from '@angular/core';
 
interface Address{
	street_address1?:string,
	street_address2?:string,
	city?:string,
	state?:string,
	country?:string,
	zipcode?:string
};

@Pipe({
  name: 'fullAddress'
})
export class FullAddressPipe implements PipeTransform {

  address:any;


  transform(value: Address[], args: string[]): any {

  	this.address = ['street_address1','street_address2','city','state','country','zipcode'];


	return Object.keys(value).map(key => {

		
		if(this.address.indexOf(key) != -1){
			return value[key] ==""?'':value[key];	
		}

		return;

	}).filter(key =>{
		return key
	}).join(', ');


  }
}