State

State is similar to props, but it is private and fully controlled by the component.
link - channel9.msdn.com/Shows/Web-Wednesday/How-do-I-work-with-state-in-React


interface IState_BETClass { 
  sItems: IListItem[]
}

States should only be used attributes that need to change
A parent can pass in props to set the default values for the state during construction.



State is a feature only available in classes.


  constructor(props) { 
    super(props);
    this.state = {date: new Date()};
  }




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