[Stownheidg]

const createRandArr = (min, max, length = 10) => {
  let arr = [];
  for (let i = 0; i < length; i++) arr.push(Math.round(Math.random() * (max - min) + min));
  return arr;
};

const arr = createRandArr(-100, 100);

const findMinPositive = arr => Math.min.apply(null, arr.filter(number => number > 0));

console.log(findMinPositive(arr), arr);