src/Utl.js
function uniqueize(a) {
  return a.filter((elt, i) => a.indexOf(elt) === i);
}
function uniqueize(a) {
  return a.filter((elt, i) => a.indexOf(elt) === i);
}
function uniqueize ( a ) { return a . filter ( ( elt , i ) => a . indexOf ( elt ) === i ) ; }
Create an array of unique values. @TODO replace this logic using Set.
Create an array of unique values .