@onesy/utils/esm/unique.js

Utils

import is from './is';
import getObjectValue from './getObjectValue';
/**
 * It returns an array with unique simple values
 * and / or array and object values.
 *
 * Referenced values are only compared based on
 * values in those reference type values based on array
 * of keys provided in the second argument in the method.
 *
 * Uniqueness of array and object values is separatelly
 * evaluated based on keys value and returned in the result.
 */

const unique = function (object) {
  for (var _len = arguments.length, args = new Array(_len > 1 ? _len - 1 : 0), _key = 1; _key < _len; _key++) {
    args[_key - 1] = arguments[_key];
  }

  const cache = {
    simple: [],
    array: [],
    object: []
  };
  const output = [];

  if (is('array', object)) {
    object.forEach(item => {
      const isNotArrayObject = is('not-array-object', item);
      const isArray = is('array', item);
      const value = isNotArrayObject || !args.length ? item : getObjectValue(item, ...args);
      const cacheArray = cache[isNotArrayObject ? 'simple' : isArray ? 'array' : 'object'];
      const exists = cacheArray.find(cacheItem => value === cacheItem);

      if (!exists && value !== undefined) {
        output.push(item);
        cache[isNotArrayObject ? 'simple' : isArray ? 'array' : 'object'].push(value);
      }
    });
  }

  return output;
};

export default unique;