How to use

moons

function

in

Array

  return produce(state, draft => {
    const idx = draft.planets.findIndex(p => p.id === draft.currentPlanetContext.id);
    let moons = draft.planets[idx].moons || [];
    action.newMoon.id = Date.now();
    moons.push(action.newMoon);
    let planet = draft.currentPlanetContext;
    const idx = draft.planets.findIndex(p => p.id === planet.id);
    const moons = planet.moons.filter(m => m.id !== action.moon.id);
    planet.moons = draft.planets[idx].moons = moons;
  });
case actionTypes.EDIT_MOON:
  return produce(state, draft => {
    const moonIdx = draft.currentPlanetContext.moons.findIndex(m => m.id === action.moon.id);
    const planetIdx = draft.planets.findIndex(p => p.id === draft.currentPlanetContext.id);
    draft.currentPlanetContext.moons[moonIdx] = draft.planets[planetIdx].moons[moonIdx] = action.moon;
  });
default: