(function (exports) {
  'use strict';

  function compare(a, b) {
    return a - b;
  }

  /**
   * Insertionsort algorithm.<br><br>
   * Time complexity: O(N^2).
   *
   * @example
   *
   * var sort = require('path-to-algorithms/src' +
   * '/sorting/insertion-sort').insertionSort;
   * console.log(sort([2, 5, 1, 0, 4])); // [ 0, 1, 2, 4, 5 ]
   *
   * @public
   * @module sorting/insertionsort
   * @param {Array} array Input array.
   * @param {Function} cmp Optional. A function that defines an
   * alternative sort order. The function should return a negative,
   * zero, or positive value, depending on the arguments.
   * @return {Array} Sorted array.
   */
  function insertionSort(array, cmp) {
    cmp = cmp || compare;
    var current;
    var j;
    for (var i = 1; i < array.length; i += 1) {
      current = array[i];
      j = i - 1;
      while (j >= 0 && cmp(array[j], current) > 0) {
        array[j + 1] = array[j];
        j -= 1;
      }
      array[j + 1] = current;
    }
    return array;
  }

  exports.insertionSort = insertionSort;

})(typeof window === 'undefined' ? module.exports : window);