bbo/unique_by.js

bbo is a utility library of zero dependencies for javascript.

'use strict';

/**
 * Returns all unique values of an array, based on a provided comparator function.
 */
var uniqueBy = (arr, fn) => arr.reduce((acc, v) => {
  if (!acc.some(x => fn(v, x))) acc.push(v);
  return acc;
}, []);

module.exports = uniqueBy;