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Working with MobX#


Lens uses MobX on top of React's state management system. The result is a more declarative state management style, rather than React's native setState mechanism.

You can review how React handles state management here.

The following is a quick overview:

  • React.Component is generic with respect to both props and state (which default to the empty object type).
  • props should be considered read-only from the point of view of the component, and it is the mechanism for passing in arguments to a component.
  • state is a component's internal state, and can be read by accessing the super-class field state.
  • state must be updated using the setState parent method which merges the new data with the old state.
  • React does some optimizations around re-rendering components after quick successions of setState calls.

How MobX Works:#

MobX is a package that provides an abstraction over React's state management system. The three main concepts are:

  • observable is a marker for data stored in the component's state.
  • action is a function that modifies any observable data.
  • computed is a marker for data that is derived from observable data, but that is not actually stored. Think of this as computing isEmpty rather than an observable field called count.

Further reading is available on the MobX website.