Sum All Numbers in a Range not accepting answer

JavaScript
1

Tell us what’s happening:
I am getting the correct return value for each test but FCC isn’t accepting it
Im not sure if it’s because my code is so messy or what.

Your code so far

function sumAll(arr) {
  var max = arr.reduce(function(a, b) {
    return Math.max(a, b);
  });

  var min = arr.reduce(function(a, b) {
    return Math.min(a, b);
  });

  var result;
  for (var i = min; i <= max; i++) {
    newArr.push([i]);
  }
  var flat = newArr.reduce(function (a, b) {
    return a.concat(b);
  });
  var sum = flat.reduce(function (a, b) {
    return a + b;
  }, 0);
  return sum;
}

sumAll([5, 10]);

Your browser information:

Your Browser User Agent is: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_13_2) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/63.0.3239.84 Safari/537.36.

Link to the challenge:

3

How is:

var max = Math.max(...arr);
var min = Math.max(...arr);

more advanced, than your code? As to me it seems simpler.

Why do you making array of arrays, then flatten it? If you don’t need that you could push just number:

arr.push(i) // instead of arr.push([i])

You can also square whole range, then compute square root out of it.