class MATH {
  add(a,b){
    let result = +a + +b;
    return result;
  }

  substract(a,b){
    let result = a - b;
    return result;
  }

  mult(a,b){
    let result = a * b;
    return result;
  }

  div(a,b){
    let result = a / b;
    return result;
  }
}

let math = new MATH();


calculate: function(target, room, user){
        let myArray;
        if(target.includes('+')){
        myArray = target.split('+');
        this.say(math.add(myArray[0],myArray[1]));
    }
       if(target.includes('-')){
       myArray = target.split('-');
       this.say(math.substract(myArray[0],myArray[1]));
    }
       if(target.includes('*')){
       myArray = target.split('*');
       this.say(math.mult(myArray[0],myArray[1]));
    }

      if(target.includes('/')){
      myArray = target.split('/');
      this.say(math.div(myArray[0],myArray[1]));
    }
  },