- Use new Set() and the spread operator (...) to create an array of the unique values in arr.
- Use Array.prototype.filter() to create an array containing only the unique values.
//#Source https://bit.ly/2neWfJ2 const filter_Non_Unique = arr => arr.filter(i => arr.indexOf(i) === arr.lastIndexOf(i)); console.log(filter_Non_Unique([1, 2, 2, 3, 4, 4, 5])); console.log(filter_Non_Unique([1, 2, 3, 4]));
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