YeQingnan

Each product era can be divided into two phases: 1) the gestation phase, when the new platform is first introduced but is expensive, incomplete, and/or difficult to use, 2) the growth phase, when a new product comes along that solves those problems, kicking off a period of exponential growth.

Reactive programming uses functional utilities like map, filter, and reduce to create and process data flows which propogate changes through the system: hence, reactive. When input x changes, output y updates automatically in response.