Find Min Value of an Array in JavaScript

const Compare = {
  LESS_THAN: -1,
  BIGGER_THAN: 1,
  EQUALS: 0
};

function defaultCompare(a, b) {
  if (a === b) {
    return Compare.EQUALS;
  }
  return a < b ? Compare.LESS_THAN : Compare.BIGGER_THAN;
}

let array = [2,1,5,4,3,8,7,6];
array = findMinValue(array);
console.log(array);


function findMinValue(array, compareFn = defaultCompare) {
  if (array && array.length > 0) {
    let min = array[0];
    for (let i = 1; i < array.length; i++) {
      if (compareFn(min, array[i]) === Compare.BIGGER_THAN) {
        min = array[i];
      }
    }
    return min;
  }
  return undefined;
}

Output:

1