I see the target

Now that we know the number of miles per flight, nothing prevents us from knowing how many times we will have to fly to the same destination in order to get a trip to Tokyo.

Let’s add another parameter to our calculateFlights function. It will contain the number of miles required. Now it’s miles to Tokyo, but what if Muffin decides to save up for a flight somewhere else? In that case, all we would have to do is change the value of the argument and call the function.

Since we are making a universal program, the name of the new parameter also must be universal. Therefore a name like milesToTokyo is not for purpose; it is too specific and cannot be re-used. Choose milesTarget. This name fits better, because with such a parameter we can calculate the number of flights even to Seattle.

To get the number of flights, we need to divide milesTarget by miles accrued for one flight. Note that the result may not be an integer. Since we are dealing with flights, not taking into account the fractional part when rounding up is incorrect. For example, if we need 25.2 flights to get 15000 miles, this means that we should have 26 flights as a result. Otherwise we will be just a few miles short. Therefore, in our task, we will round the result of the calculations up, using Math.ceil().