lodash/_baseSortedUniqBy.js

define(['./eq'], function(eq) {

  /**
   * The base implementation of `_.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 baseSortedUniqBy(array, iteratee) {
    var index = 0,
        length = array.length,
        value = array[0],
        computed = iteratee ? iteratee(value) : value,
        seen = computed,
        resIndex = 1,
        result = [value];

    while (++index < length) {
      value = array[index],
      computed = iteratee ? iteratee(value) : value;

      if (!eq(computed, seen)) {
        seen = computed;
        result[resIndex++] = value;
      }
    }
    return result;
  }

  return baseSortedUniqBy;
});