function checkIfNumber(symbol){
    if(typeof symbol=="number"){
        return true
    }else{
        return false;
    }
}


    function add (...items){
        arr=[];
        for (const item of items) {
           if(checkIfNumber(item)!=true) {
            throw new Error(`${item} is not a number`);
           }else{
               arr.push(item);
           }
        }
        const reducer = (accumulator, currentValue) => accumulator + currentValue;
        console.log(arr.reduce(reducer))
    }



function multy (...items){
    arr=[];
    for (const item of items) {
       if(checkIfNumber(item)!=true) {
        throw new Error(`${item} is not a number`);
       }else{
           arr.push(item);
       }
    }
    const reducer = (accumulator, currentValue) => accumulator * currentValue;
    console.log(arr.reduce(reducer))
    }


    const Calculator = (a,b,...Func) => {
        let arr = [];
      for(const item of Func)
      {
          arr.push(item(a,b));
      }
      return arr;
    };
  try{
      Calculator(2,5,multy,add,add);
    }catch(error)
    {
        console.log(error.message);
    }