text: import {
      FETCH_COURSES,
      TOGGLE_ENROLLED
  } from '../actions/types';
  
  export default function(state = [], action) {
      switch (action.type) {
          case FETCH_COURSES:
              
              return [
                  ...state,
                  ...action.payload
              ]
              case TOGGLE_ENROLLED:
                  console.log(action.payload)
                  const newCourses = state.map(course => {
                      if(course.id == action.payload) {
                          course.enrolled = !course.enrolled
                      }
                      return course
                  })
                  return [
                      ...newCourses
                  ]
              default:
                  return state;
  
      }
  }