combine<DATA_2 extends Object, DATA_3 extends Object> method

LceState<DATA_3> combine<DATA_2 extends Object, DATA_3 extends Object>(LceState<DATA_2> other, DATA_3? mapper(DATA_1? data1, DATA_2? data2))

Combines two Lce states. Here is the result state matrix

Receiver	other	Result
Loading	Loading	Loading
Loading	Content	Loading
Loading	Error	Error
Loading	Terminated	Terminated
Content	Loading	Loading
Content	Content	Content*
Content	Error	Error
Content	Terminated	Terminated
Error	Loading	Error
Error	Content	Error
Error	Error	Error
Error	Terminated	Terminated
Terminated	Loading	Terminated
Terminated	Content	Terminated
Terminated	Error	Terminated
Terminated	Terminated	Terminated

• Receiver - An Lce state that has a priority in final state resolution
• other Other state to combine with
• mapper Data mapper function. Returning null from it means data is not ready and will result in loading state even if both states has data. You may return null-value of any kind to alter resulting state.

Implementation

LceState<DATA_3> combine<DATA_2 extends Object, DATA_3 extends Object>(
  LceState<DATA_2> other,
  DATA_3? Function(DATA_1? data1, DATA_2? data2) mapper
) {
  final data3 = mapper(data, other.data);
  final isValid = null != data3 && dataIsValid && other.dataIsValid;

  return when(
      loading: (state) => other.whenElse(
          error: (state2) => LceState.error(data3, isValid, state2.error),
          terminated: () => LceState.terminated(),
          onElse: (state2) => LceState.loading(data3, isValid, state.type)
      ),
      content: (state) => other.when(
          error: (state2) => LceState.error(data3, isValid, state2.error),
          terminated: () => LceState.terminated(),
          loading: (state2) => LceState.loading(data3, isValid, state2.type),
          content: (state2) => null == data3
              ? const LceState.loading(null, false)
              : LceState.content(data3, isValid)
      ),
      error: (state) => other.whenElse(
          terminated: () => LceState.terminated(),
          onElse: (state2) => LceState.error(data3, isValid, state.error)
      ),
      terminated: () => LceState.terminated()
  );
}