Sum input numbers
Write the function
- Asks the user for values using
promptand stores the values in the array.
- Finishes asking when the user enters a non-numeric value, an empty string, or presses “Cancel”.
- Calculates and returns the sum of array items.
P.S. A zero
0 is a valid number, please don’t stop the input on zero.
Please note the subtle, but important detail of the solution. We don’t convert
value to number instantly after
prompt, because after
value = +value we would not be able to tell an empty string (stop sign) from the zero (valid number). We do it later instead.