1  var baseSortedIndex = require('./_baseSortedIndex'),
 2      eq = require('./eq');
 3  
 4  /**
 5   * This method is like `_.indexOf` except that it performs a binary
 6   * search on a sorted `array`.
 7   *
 8   * @static
 9   * @memberOf _
10   * @since 4.0.0
11   * @category Array
12   * @param {Array} array The array to inspect.
13   * @param {*} value The value to search for.
14   * @returns {number} Returns the index of the matched value, else `-1`.
15   * @example
16   *
17   * _.sortedIndexOf([4, 5, 5, 5, 6], 5);
18   * // => 1
19   */
20  function sortedIndexOf(array, value) {
21    var length = array == null ? 0 : array.length;
22    if (length) {
23      var index = baseSortedIndex(array, value);
24      if (index < length && eq(array[index], value)) {
25        return index;
26      }
27    }
28    return -1;
29  }
30  
31  module.exports = sortedIndexOf;