Your Hyperstack Application is built from a series of Components which are Ruby Classes that display portions of the UI. Hyperstack Components are implemented using React, and can interoperate with existing React components and libraries. Here is a simple example that displays a ticking clock:

# Components inherit from the HyperComponent base class
# which supplies the DSL to translate from Ruby into React
# function calls
class Clock < HyperComponent
# Components can be parameterized.
# in this case you can override the default
# with a different format
param format: "%m/%d/%Y %I:%M:%S"
# After_mount is an example of a life cycle method.
after_mount do
# Before the component is first rendered (mounted)
# we setup a periodic timer that will update the
# current_time instance variable every second.
# The mutate method signals a change in state
every(1.second) { mutate @current_time = Time.now }
# every component has a render block which describes what will be
# drawn on the UI
render do
# Components can render other components or primitive HTML or SVG
# tags. Components also use their state to determine what to render,
# in this case the @current_time instance variable
DIV { @current_time.strftime(format) }

The following chapters cover these aspects and more in detail.