Selector interface support

Since many people are interested in the selector interface, I start thinking about it.

from there: https://github.com/dai-shi/react-hooks-easy-redux/issues/3#issuecomment-477992639

We shouldn’t track the state usage in selectors. We don’t need to track it if only the result is important. That brings me an idea to provide another hook, which is much like something many have been discussing.

const Pair = props => {
  const prevValue = useRef(null);
  const mapState = state => {
    const { value, name } = state[props.sliceId][props.pairId];
    const direction = value > prevValue.current ? "up" : "down";
    return { value, name, direction };
  };
  const { value, name, direction } = useReduxStateMapped(mapState);

  useEffect(() => {
    prevValue.current = value;
  });
  return (

It works somewhat magically. Closures are fine.

[dai-shi]

My current implementation of useReduxStateMapped has several issues: (1) there is no performance benefit. (2) it doesn’t yet work without external memoization. (3) it can’t deal well with multiple selectors/conditional usage.

All right, let me start over. Please be patient. The good news is now that I have better understanding of your requirement.

[theKashey]

🚀