redux-fluorine/es/util/reapplyActionsWithout.js

A Redux enhancer to manage groups of actions as observables (agendas)

export default function reapplyActionsWithout(reducer, base, subtract) {
  var diverged = false;
  var anchor = base.lastValidState || base;
  var lastValid = anchor;

  while (anchor.next) {
    // Iterate to next state
    anchor = anchor.next;
    var _anchor = anchor;
    var action = _anchor.action;


    if (subtract.indexOf(action) > -1) {
      // Prevent recomputation of any states until it's actually
      // necessary

      diverged = true;

      // Link last valid state for any agenda that might have stored
      // this state as its anchor

      anchor.lastValidState = lastValid;
    } else {
      if (diverged) {
        // Recompute state

        anchor.state = reducer(lastValid.state, action);
      }

      // Link the last valid state to this equally valid one and
      // replace the lastValid reference with this state

      lastValid.next = anchor;
      lastValid = anchor;
    }
  }

  // Make sure that the lastValid state is not pointing anywhere and
  // return it

  lastValid.next = null;
  return lastValid;
}