/**
 * 
 * @authors your name (you@example.org)
 * @date    2020-12-16 15:26:52
 * @version $id$
 */


if (!string.prototype.startswith) {
  (function() {
    'use strict'; // needed to support `apply`/`call` with `undefined`/`null`
    var defineproperty = (function() {
      // ie 8 only supports `object.defineproperty` on dom elements
      try {
        var object = {};
        var $defineproperty = object.defineproperty;
        var result = $defineproperty(object, object, object) && $defineproperty;
      } catch(error) {}
      return result;
    }());
    var tostring = {}.tostring;
    var startswith = function(search) {
      if (this == null) {
        throw typeerror();
      }
      var string = string(this);
      if (search && tostring.call(search) == '[object regexp]') {
        throw typeerror();
      }
      var stringlength = string.length;
      var searchstring = string(search);
      var searchlength = searchstring.length;
      var position = arguments.length > 1 ? arguments[1] : undefined;
      // `tointeger`
      var pos = position ? number(position) : 0;
      if (pos != pos) { // better `isnan`
        pos = 0;
      }
      var start = math.min(math.max(pos, 0), stringlength);
      // avoid the `indexof` call if no match is possible
      if (searchlength + start > stringlength) {
        return false;
      }
      var index = -1;
      while (++index < searchlength) {
        if (string.charcodeat(start + index) != searchstring.charcodeat(index)) {
          return false;
        }
      }
      return true;
    };
    if (defineproperty) {
      defineproperty(string.prototype, 'startswith', {
        'value': startswith,
        'configurable': true,
        'writable': true
      });
    } else {
      string.prototype.startswith = startswith;
    }
  }());
}