Intermediate Algorithm Scripting: Sum All Numbers in a RangePassed

Intermediate Algorithm Scripting: Sum All Numbers in a RangePassed.js

function sumAll(arr) {
  let sortedArr = arr.sort((a, b)=>a-b);

  let sum = sortedArr[0] + sortedArr[1];

  for(let i = sortedArr[0]+1; i< sortedArr[1]; i++){
    sum+= i;
  }

  return sum;
}

sumAll([1, 4]);