let testArr = ["hej", "Skoæske", "wjiiojo", "klsjdlkasjlkjdlasjd", "2s"];

function mindreEnd(a, b) {
    if(typeof a == 'number' && typeof b == 'number')  {
        if(a < b){
            return true;
        } else {
            return false;
        }
    } else if (typeof a == 'string' && typeof b == 'string')  {
        if(a.length < b.length){
            return true;
        } else {
            return false;
        }
    } else {
        throw Error ("Input must be the same");
    }
};

function test(array) {
  let mindst = array[0];
    for(let i of array){
      if(mindreEnd(i, mindst) == true){
          mindst = i;
      }
  }
  console.log("Mindste element er: " + mindst);
};

test(testArr);