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var eq = require('./eq');

/**
 * 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) {
  var index = -1,
      length = array.length,
      resIndex = 0,
      result = [];

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

    if (!index || !eq(computed, seen)) {
      var seen = computed;
      result[resIndex++] = value === 0 ? 0 : value;
    }
  }
  return result;
}

module.exports = baseSortedUniq;