1. Basic Search

• Add search method to contact service
• Add search method to list component
• Add search box to contacts list template
• Wire it all up

2. Debounce and Deduplicate Searches

• Pipe search input events to a new Subject property
• Pipe the Subject through debounce and distinctUntilChanged before the subscription does the actual search

3. Out of Order Responses

• Chuck a switchMap in the search terms pipe. This stops previous slow search responses from overwriting newer ones
• Merge this observable with the initial all contacts observable. This stops the initial contact list from being empty
• (simulate the initial get all contacts load being super slow and find a way a way to deal with this)

4. Refactor to a Service

• Move the search complexity from the list component into the contracts service