lodash/_baseSortedUniq.js

import eq from './eq.js';

/**
 * The base implementation of `_.sortedUniq` and `_.sortedUniqBy` without
 * support for iteratee shorthands.
 *
 * @private
 * @param {Array} array The array to inspect.
 * @param {Function} [iteratee] The iteratee invoked per element.
 * @returns {Array} Returns the new duplicate free array.
 */
function baseSortedUniq(array, iteratee) {
  let seen;
  let index = -1;
  let resIndex = 0;

  const length = array.length;
  const result = [];

  while (++index < length) {
    const value = array[index], computed = iteratee ? iteratee(value) : value;
    if (!index || !eq(computed, seen)) {
      seen = computed;
      result[resIndex++] = value === 0 ? 0 : value;
    }
  }
  return result;
}

export default baseSortedUniq;