function solution(paramArr1, goal) {
    let result = 0;

    let lt = 0;
    let sum = 0;

    for (let rt = 0; rt < paramArr1.length; rt++) {
      sum += paramArr1[rt];
      if (sum === goal) result++;
      while (sum >= goal) {
        sum -= paramArr1[lt++];
        if (sum === goal) result++;
      }
    }
    return result;
  }
  const result = solution([1, 2, 1, 3, 1, 1, 1, 2], 6);
  expectEqualTest(result, 3);