프로그래머스 - 두정수사이의합

const getSum = (a, b) => {
    let answer = 0;
    let arr = [a, b];

    arr.sort((a, b) => a - b);
    let start = arr[0];
    let end = arr[1];
    while (start < end + 1) {
        answer = answer + start;
        start++;
    }
    if (a === b) answer = a;
    return answer;
};
test("두정수의 합", () => {
    expect(getSum(-3, -5)).toBe(-12);
});