@glimmer/compiler/dist/modules/es5/lib/shared/list.js

function _createForOfIteratorHelperLoose(o, allowArrayLike) { var it; if (typeof Symbol === "undefined" || o[Symbol.iterator] == null) { if (Array.isArray(o) || (it = _unsupportedIterableToArray(o)) || allowArrayLike && o && typeof o.length === "number") { if (it) o = it; var i = 0; return function () { if (i >= o.length) return { done: true }; return { done: false, value: o[i++] }; }; } throw new TypeError("Invalid attempt to iterate non-iterable instance.\nIn order to be iterable, non-array objects must have a [Symbol.iterator]() method."); } it = o[Symbol.iterator](); return it.next.bind(it); }

function _unsupportedIterableToArray(o, minLen) { if (!o) return; if (typeof o === "string") return _arrayLikeToArray(o, minLen); var n = Object.prototype.toString.call(o).slice(8, -1); if (n === "Object" && o.constructor) n = o.constructor.name; if (n === "Map" || n === "Set") return Array.from(o); if (n === "Arguments" || /^(?:Ui|I)nt(?:8|16|32)(?:Clamped)?Array$/.test(n)) return _arrayLikeToArray(o, minLen); }

function _arrayLikeToArray(arr, len) { if (len == null || len > arr.length) len = arr.length; for (var i = 0, arr2 = new Array(len); i < len; i++) { arr2[i] = arr[i]; } return arr2; }

import { isPresent, mapPresent } from '@glimmer/util';
export var PresentList = /*#__PURE__*/function () {
  function PresentList(list) {
    this.list = list;
  }

  var _proto = PresentList.prototype;

  _proto.toArray = function toArray() {
    return this.list;
  };

  _proto.map = function map(callback) {
    var result = mapPresent(this.list, callback);
    return new PresentList(result);
  };

  _proto.filter = function filter(predicate) {
    var out = [];

    for (var _iterator = _createForOfIteratorHelperLoose(this.list), _step; !(_step = _iterator()).done;) {
      var item = _step.value;

      if (predicate(item)) {
        out.push(item);
      }
    }

    return OptionalList(out);
  };

  _proto.toPresentArray = function toPresentArray() {
    return this.list;
  };

  _proto.into = function into(_ref) {
    var ifPresent = _ref.ifPresent;
    return ifPresent(this);
  };

  return PresentList;
}();
export var EmptyList = /*#__PURE__*/function () {
  function EmptyList() {
    this.list = [];
  }

  var _proto2 = EmptyList.prototype;

  _proto2.map = function map(_callback) {
    return new EmptyList();
  };

  _proto2.filter = function filter(_predicate) {
    return new EmptyList();
  };

  _proto2.toArray = function toArray() {
    return this.list;
  };

  _proto2.toPresentArray = function toPresentArray() {
    return null;
  };

  _proto2.into = function into(_ref2) {
    var ifEmpty = _ref2.ifEmpty;
    return ifEmpty();
  };

  return EmptyList;
}(); // export type OptionalList<T> = PresentList<T> | EmptyList<T>;

export function OptionalList(value) {
  if (isPresent(value)) {
    return new PresentList(value);
  } else {
    return new EmptyList();
  }
}
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cHRpb25hbExpc3Q8VD47XG5cbmV4cG9ydCB0eXBlIE1hcExpc3Q8VCwgVSwgTCBleHRlbmRzIE9wdGlvbmFsTGlzdDxUPj4gPSBMIGV4dGVuZHMgUHJlc2VudExpc3Q8VD5cbiAgPyBQcmVzZW50TGlzdDxVPlxuICA6IEwgZXh0ZW5kcyBFbXB0eUxpc3Q8VD5cbiAgPyBFbXB0eUxpc3Q8VT5cbiAgOiBuZXZlcjtcbiJdLCJzb3VyY2VSb290IjoiIn0=