Angular Services

The evidence service

Let's start by creating an empty service and creating a very basic structure for its functions. Create a new TypeScript file inside the evidence/ folder and add the following contents to it:

// src/app/evidence/evidenc.service.ts 
import {Injectable} from "@angular/core"; 
 
@Injectable() 
export class EvidenceService { 
  private words = [ {key:"w1",value:1}, {key:"w2",value:2} ]; 
  wordCounts(url) { 
    // ToDo: get a url subscribe to its response and call other 
    // functions to count the words and their occurrence in it. 
    // Ideally it will return an array of objects. 
    return words; 
  } 
} 

So the draft version of our service is very simple. It gets a URL which contains the article of our interest and then finds and returns all unique words ...