array-non-uniq Get the non-unique items in an array. Install npm install array-non-uniq Usage const arrayNonUniq = require("array-non-uniq"); arrayNonUniq([1, 1, 2, 3, 3]);//=> [1, 3] arrayNonUniq(["foo", "foo", "bar", "foo"]);//=> ['foo'] API arrayNonUniq(array) array Type: array The array to process.