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filterNonUniqueBy javascript Code Snippet in 2023

arrayintermediate

Last Updated: 1 February 2023

Creates an array with the non-unique values filtered out, based on a provided comparator function.

  • Use Array.prototype.filter() and Array.prototype.every() to create an array containing only the unique values, based on the comparator function, fn.
  • The comparator function takes four arguments: the values of the two elements being compared and their indexes.
const filterNonUniqueBy = (arr, fn) => arr.filter((v, i) => arr.every((x, j) => (i === j) === fn(v, x, i, j)));
filterNonUniqueBy( [ { id: 0, value: 'a' }, { id: 1, value: 'b' }, { id: 2, value: 'c' }, { id: 1, value: 'd' }, { id: 0, value: 'e' } ], (a, b) => a.id === b.id ); // [ { id: 2, value: 'c' } ]

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