Find minimum aand max in javascript

gistfile1.txt

'use strict'
function findMinMax(array , start , end )
{
    debugger;
    var max , min;
    if (start == end)
    {
        max = array[start];
        min = array[start];
    }
    else if (start +1 == end)
    {
        if (array[start] < array[end])
        {
            max = array[end];
            min = array[start];
        }
        else
        {
            max = array[start];
            min = array[end];
        }
    }
    else 
    {
        var mid = Math.trunc(start + (end - start)/2);
        var left = [];
        left = findMinMax(array , start , mid);
        var right = [];
        right = findMinMax(array , mid+1 , end);
        if (left[0] > right[0])
            max = left[0];
        else 
            max = right[0];
        if (left[1] < right[1])
            min = left[1];
        else
            min = right[1];
    }
    var ans = [max , min];
    return ans;
}
const arr = [3 , 7 , 9 , 2 , 1 , 8];
console.log(findMinMax(arr , 0 , arr.length-1));