Functional Reactive Programming

Appendix C. Comparison of FRP systems

The tables in this appendix relate the primitives named in this book to each system’s API. They’re not necessarily directly equivalent, but you will be able to tell where in that system’s API to start looking. If a field is blank, there is no equivalent.

Variable names give clues, mainly these:

• s—Stream
• c—Cell
• i—Initial value
• h—Handler
• a—Value

Table C.1. Cheat sheet for Sodium, RxJS, and Bacon.JS

Primitive	Sodium (Java)	RxJS (JS)	Bacon.JS (JS)
Stream	Stream	Rx.Observable	EventStream
Cell	Cell	Rx.BehaviorSubject	Property
never	new Stream()	Rx.Observable.of()	Bacon.never()
constant	new Cell(i)	Rx.Observable.of(i)	Bacon.constant(i)
map (S)	s.map(f)	s.map(f)	e.map(f)