This is an implementation of NGRX on a simple Angular aplication
So basicaly the management with NGRX begin with reducer because this have the initial state but also we should define an interface which the initial state will be using. Then we have to create the reducer using createReducer and putting initial state as firts param followed by each function that correspond with each actions. This take us to define the actions used on reducer.
Actions
Actions are that action or event that the app detect or recive from the user it could be increment a number or change a unit of mesure.In this case we will be using increment, decrement and reset as actions.
Selectors
selectors are that way that we could select the data that we need from the store which will be bringing us the data subcribing us to that stream of data.
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