SOURCE

var str = "Compare with your a solution";
function findShort(s){
  return Math.min.apply(null, s.split(' ').map(w => w.length));
}
function sortNumber(a,b)
{
return a.length - b.length
}
console.log(findShort(str))
console.log(str.split(' ').sort(sortNumber)[0])
console.log(str)