How to create a list of unique items in JavaScript?

Question

In my CouchDB reduce function I need to reduce a list of items to the unique ones.

Note: In that case it\'s ok to have a list, it will be a small number of items

Answer 1

This should work with anything, not just strings:

export const getUniqueList =  (a: Array) : Array => {

  const set = new Set();

  for(let v of a){
      set.add(v);
  }

  return Array.from(set);

};

the above can just be reduced to:

export const getUniqueValues = (a: Array) => {
   return Array.from(new Set(a));
};

:)