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Logica

From RTK

Logica is an optimised state model that uses the observer pattern. Node and Dependent can be bound to Recreate nodes as they provide an __RCImplementor.

Node​

A Node represents an entry point for a value, when updated, it relays changes down the tree to Dependents

local Text = Logica.Node("ez")

print(Text:get()) --> ez

Dependent​

A Dependent is a listener that reacts to the changes of other Dependents or Nodes, then creates a new output from those objects

local coolNumber = Logica.Node(2)

local evenCoolerNumber = Logica.Dependent(function()
	return coolNumber:get() * 2
end)

coolNumber:set(4)
warning

Dependents should not yield, the state engine assumes all nodes in the tree resume within the same resumption cycle.

Observer​

Observers represent the exit of a computation, and cannot be depended upon, but still react to other Nodes changing around it

local coolNumber = Logica.Node(2)

local evenCoolerNumber = Logica.Dependent(function()
	return coolNumber:get() * 2
end)

Logica.Observer = Logica.Observer(function()
	print(`the number is {evenCoolerNumber:get()}`)
end)

coolNumber:set(4)

Observer updates are deffered to the next tick, and do not implement __RCImplementor unlike other Nodes in Logica.