are there reducers in react redux code example

Example 1: redux reducer

const Reducer = (state=[],action) =>{
	switch(action.type){
      case'add':
        return [...state,action.payload]
      default:
        return state ;
    }
}

Example 2: react/redux reducers sintaxe

const reduxSinaxe = (state = [], action) => {
  switch (action.type) {
    case "@smthg/ACTION":
      const { anyConst } = action;
      return [...state, anyConst];

    default:
      return state;
  }
};

export default reduxSinaxe;