ycl | Search , Play , Download youtube videos from the terminal | Video Utils library

Since ES6 it's easy to create arrays of unique values using a Set, but in this case you need to transform the strings (remove spaces) to find the duplicates, but still preserve the original strings, so you can return them. You can do this by creating a Map with the "string without space" as the key, and the original string as the value. Since Map's keys are unique.

Create a Map by using Array.map() to generate an array of [string without spaces, string]. Then convert the Map.values() iterator back to an array. This will return the last item in each series of duplicates.