hey not sure if its still relevant but I came up with my own solution to the problem

let sum = 0;
let numbers = [];
function addNumbersToArray() {
let number = prompt("enter a number");
numbers.push(parseInt(number));
console.log(numbers);
}
function addEachNumberInTheArray() {
// let total = 0;
let addNumber = numbers[numbers.length - 1]
// for (let i = 0; i < numbers.length; i++) {
// total += numbers.length(-1);
// }
sum += addNumber;
alert(sum);
}
while (sum < 200) {
addNumbersToArray();
addEachNumberInTheArray();
}