Shared.service.ts

import { Injectable } from '@angular/core';
import { Http, Headers, Response } from "@angular/http";
import { Observable } from "rxjs";
import Web3 from 'web3'; /** I think this is equivalent
 to the require function. I'm also doing 'web3/lib because that is where the web3.js file is*/

		let web3:Web3 = new Web3();
		if (typeof web3 !== 'undefined') {
			web3 = new Web3(web3.currentProvider);
		} /** set the provider you want from Web3.providers */
		else {
			web3 = new Web3(new Web3.providers.HttpProvider("http://localhost:8545"));
		}

		

@Injectable()
export class SharedService {
	currencyURL = "http://api.fixer.io/latest?symbols="; 
    totReqsMade: number = 0;
	constructor(private _http: Http) {
	}

getBalance(Add){
        return this._http.get(this.currencyURL + Add)
            .map(response => {
                { return response.json() };
            })
            .catch(error => Observable.throw(error.json()));
}
getEtherBalance(PubAd) { 
return web3.eth.getBlock(48, function(error, result){
    if(!error)
        console.log(result)
    else
        console.error(error);

})
    }

/** let web3 = require('web3'); Trying to instantiate how the website says to do it.*/
}



    
 

Now I'm having trouble with these lines

return  this.web3.eth.getBalance(PubAd, function(error, result){
    if(!error)

        /**console.log(String(result));*/
    	console.log(this.web3.fromWei(String(result), 'ether'));
    else
        console.error(error);
})
            .map(response => 
                response.json()
            )

I'm getting two errors

1. ERROR TypeError: Cannot read property 'map' of undefined.
2. Cannot read property 'fromWei' of undefined

Looks like you're having scoping issues... Look into how scoping works in JavaScript