LearnFromWork

serve with port: 8081

1. continuously polling with switchmap

2. debounce user nostoping action with deboucetime

3. merge inner observal to emit to outer observable

4. distinct and throttle observal with example of scroll event

5. use canvas for displaying graph

6. render only changed field with trackby

7. websocket observable, start local server with spring boot https://github.com/yorrran/spring-boot-websocket