1  var isSymbol = require('./isSymbol');
 2  
 3  /**
 4   * The base implementation of methods like `_.max` and `_.min` which accepts a
 5   * `comparator` to determine the extremum value.
 6   *
 7   * @private
 8   * @param {Array} array The array to iterate over.
 9   * @param {Function} iteratee The iteratee invoked per iteration.
10   * @param {Function} comparator The comparator used to compare values.
11   * @returns {*} Returns the extremum value.
12   */
13  function baseExtremum(array, iteratee, comparator) {
14    var index = -1,
15        length = array.length;
16  
17    while (++index < length) {
18      var value = array[index],
19          current = iteratee(value);
20  
21      if (current != null && (computed === undefined
22            ? (current === current && !isSymbol(current))
23            : comparator(current, computed)
24          )) {
25        var computed = current,
26            result = value;
27      }
28    }
29    return result;
30  }
31  
32  module.exports = baseExtremum;