an example rudimentary vuex method-style getter cache - don't use this, just for illustration

getter-cache.js

mappedTask2: (state, getters) => {
  const cache = {};
  return (id) => {
    const record = state.tasks[id];
    const key = id + record.name;
    if (!cache[key]) {
      cache[key] = getters.mappedTask(id);
    }
    return cache[key];
  };
},