Functional Reactive Programming

Chapter 3. Some everyday widget stuff

This chapter covers

• Some simple GUI widget examples

We’re using this short chapter to cement the concepts of FRP with two more simple SWidget examples. We’re continuing to avoid telling you about StreamSink and CellSink for now so we can achieve a clear separation in your mind between FRP and non-FRP. We’ve talked about how people tend to gravitate toward familiar concepts—we don’t want you saying, “I know how to do this” and mixing sinks into your FRP logic, because this breaks the model. We want you to see what becomes possible when you view streams and cells only as sources.

These examples use the same primitives introduced in chapter 2, so you may need to refer back to it to refresh your memory. ...