Sum input numbers

Write the function sumInput() that:

Asks the user for values using prompt and stores the values in the array.
Finishes asking when the user enters a non-numeric value, an empty string, or presses â€œCancelâ€.
Calculates and returns the sum of array items.

P.S. A zero 0 is a valid number, please donâ€™t stop the input on zero.

Please note the subtle, but important detail of the solution. We donâ€™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.

function sumInput() {

  let numbers = [];

  while (true) {

    let value = prompt("A number please?", 0);

    // should we cancel?
    if (value === "" || value === null || !isFinite(value)) break;

    numbers.push(+value);
  }

  let sum = 0;
  for (let number of numbers) {
    sum += number;
  }
  return sum;
}

alert( sumInput() );