unexpected output js calculating min/max subset of array

Question

Given five positive integers, I am trying to find the minimum and maximum values that can be calculated by summing exactly four of the five integers.

This code works except with when all elements of array are the same integer:

function miniMaxSum(arr) {
  let min = Number.MAX_VALUE,
    max = 0;

  for (let i = 0; i < arr.length; i++) {
    let sum = 0;
    const foo = arr.filter((item) => item !== arr[i]);
    for (let x in foo) {
      sum += foo[x];
    }
    if (sum > max) max = sum;
    if (sum < min) min = sum;
    console.log(foo);
    console.log("Sum: " + sum);
  }
  console.log("Min: " + min + "\nMax: " + max);
}

let bar = [7, 69, 2, 221, 8974];
let baz = [769082435, 210437958, 673982045, 375809214, 380564127];
let a = [5, 5, 5, 5, 5];
miniMaxSum(bar);
miniMaxSum(baz);
miniMaxSum(a);

OUTPUT:

[ 69, 2, 221, 8974 ]
Sum: 9266
[ 7, 2, 221, 8974 ]
Sum: 9204
[ 7, 69, 221, 8974 ]
Sum: 9271
[ 7, 69, 2, 8974 ]
Sum: 9052
[ 7, 69, 2, 221 ]
Sum: 299
Min: 299
Max: 9271
[ 210437958, 673982045, 375809214, 380564127 ]
Sum: 1640793344
[ 769082435, 673982045, 375809214, 380564127 ]
Sum: 2199437821
[ 769082435, 210437958, 375809214, 380564127 ]
Sum: 1735893734
[ 769082435, 210437958, 673982045, 380564127 ]
Sum: 2034066565
[ 769082435, 210437958, 673982045, 375809214 ]
Sum: 2029311652
Min: 1640793344
Max: 2199437821
[]
Sum: 0
[]
Sum: 0
[]
Sum: 0
[]
Sum: 0
[]
Sum: 0
Min: 0
Max: 0

Why does the algorithm behave unexpectedly when elements of the given array are all the same integer value?

Answer 1

Replace this line:

const foo = arr.filter((item) => item !== arr[i]);

With this:

let foo = arr;
foo.splice(i,1);