Sum Numbers

function sumNumbers(input) {

    let digit = Number(input[0]);
    let sum = 0;
    let index = 1;

    while (sum < digit) {
        let currentNumber = Number(input[index]);
        sum += currentNumber;
        index++;
    }

    console.log(sum);
}

sumNumbers(["100", "10", "20", "30", "40"])