Solution to https://blog.svpino.com/2015/05/24/programming-challenge-the-position-of-the-element

posOfEl.js

/*
Solution to
https://blog.svpino.com/2015/05/24/programming-challenge-the-position-of-the-element
*/

function posOfEl(list,el){
  // if the element exist return the index
  var index = list.indexOf(el);
  if(index>=0){return index;}
  // otherwise insert it in a copy
  // of the list, sort it and return the index
  list = list.slice();
  list.push(el);
  return list.sort(function(x,y){
    return x < y ? -1 : 1;
  }).indexOf(el);
}