Edit in JSFiddle

const sumPoint = (arr) => {
  const len = arr.length;
  let sum = 0;
  let leftsum = 0;
  for (let i = 0; i < len; i++) {
    sum += arr[i];
  }
  for (let j = 0; j < len; j++) {
    sum -= arr[j];
    if (leftsum === sum) {
      return j;
    }
    leftsum += arr[j];   
  }
  return false;
}

const arr = [1,2,2,9,3,2];
console.log(sumPoint(arr));