Get all non-unique values (i.e.: duplicate/more than one occurrence) in an array

Question

I need to check a JavaScript array to see if there are any duplicate values. What\'s the easiest way to do this? I just need to find what the duplicated values are - I don\'

Answer 1

With ES6 (or using Babel or Typescipt) you can simply do:

var duplicates = myArray.filter(i => myArray.filter(ii => ii === i).length > 1);

https://es6console.com/j58euhbt/