immutable - Simplify moving from lane to another

Author: bebraw

immutable_app/app/reducers/lanes.js

@@ -88,22 +88,14 @@ export default function lanes(state = initialState, action) {
  return state.map((lane) => {
  if(lane === sourceLane) {
  // get rid of the source note
- return Map(Object.assign({}, lane, {
- notes: lane.get('notes').count() > 1 ? List(lane.get('notes').slice(0, sourceNoteIndex).concat(
- lane.get('notes').slice(sourceNoteIndex + 1)
- )): List()
- }));
+ return lane.deleteIn(['notes', sourceNoteIndex]);
  }
 
  if(lane === targetLane) {
  // and move it to target
- return Map(Object.assign({}, lane, {
- notes: List(lane.get('notes').slice(0, targetNoteIndex).concat(
- [sourceId]
- ).concat(
- lane.get('notes').slice(targetNoteIndex)
- ))
- }));
+ return lane.updateIn(['notes'], notes => notes.insert(
+ targetNoteIndex, sourceId
+ ));
  }
 
  return lane;