lenye_base/unique_by.js

基础方法

'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;