getDuplicates(array): any[]
Returns every extra instance of each item in array.
Does not modify array.
Examples
let arr = [1, 2, '', [], false, 1, 6, 7, true, 1];
result = getDuplicates(arr);
// result is now [1, 1]
arr = [1, 2, 'abc', [], false, 'abc', 6, 7, true, 'abc'];
result = getDuplicates(arr);
// result is now ['abc', 'abc']
arr = [1, [2, 3], 6, 7, 8, 9, [2, 3]];
result = getDuplicates(arr);
// result is now [ [2,3] ] Installation
npm i @writetome51/array-get-duplicates
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import {getDuplicates} from '@writetome51/array-get-duplicates';