Function startsWith

static/bootstrap-select-1.13.18/js/bootstrap-select.js:260–289

(search)

      }());
      var toString = {}.toString;
      var startsWith = function (search) {
        if (this == null) {
          throw new TypeError();
        }
        var string = String(this);
        if (search && toString.call(search) == '[object RegExp]') {
          throw new 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,