Turning on suggestions for new issues

The reactive forms API contains a mechanism for getting notified when the value of a particular form control changes. We will use it in our application to find related issues when reporting a new one. More specifically, we will display a list of suggested issues when the user starts typing in the title form control:

1. Open the issues.service.ts file and add the following method:

   getSuggestions(title: string): Issue[] {
     if (title.length > 3) {
       return this.issues.filter(issue => 
         issue.title.indexOf(title) !== -1);
     }
     return [];
   }

   The getSuggestions method takes the title of an issue as a parameter and searches for any issues that contain the same title. The search mechanism is triggered when the title parameter is more than three characters long to limit results down to a reasonable amount.

2. Open the issue-report.component.ts file and add...