Function reducer

test/test.js:38–47

(state, action)

    const initialState = {count: 0};

    function reducer(state, action) {
      switch (action.type) {
        case 'reset':
          return initialState;
        case 'increment':
          return {count: state.count + 1};
        case 'decrement':
          return {count: state.count - 1};
      }
    }

    const staticInfo = [
      {type: 'increment', text: '+'},