@glimmer/util/dist/modules/es5/lib/collections.js

function _defineProperties(target, props) { for (var i = 0; i < props.length; i++) { var descriptor = props[i]; descriptor.enumerable = descriptor.enumerable || false; descriptor.configurable = true; if ("value" in descriptor) descriptor.writable = true; Object.defineProperty(target, descriptor.key, descriptor); } }

function _createClass(Constructor, protoProps, staticProps) { if (protoProps) _defineProperties(Constructor.prototype, protoProps); if (staticProps) _defineProperties(Constructor, staticProps); return Constructor; }

export function dict() {
  return Object.create(null);
}
export function isDict(u) {
  return u !== null && u !== undefined;
}
export function isObject(u) {
  return typeof u === 'function' || typeof u === 'object' && u !== null;
}
export var StackImpl = /*#__PURE__*/function () {
  function StackImpl(values) {
    if (values === void 0) {
      values = [];
    }

    this.current = null;
    this.stack = values;
  }

  var _proto = StackImpl.prototype;

  _proto.push = function push(item) {
    this.current = item;
    this.stack.push(item);
  };

  _proto.pop = function pop() {
    var item = this.stack.pop();
    var len = this.stack.length;
    this.current = len === 0 ? null : this.stack[len - 1];
    return item === undefined ? null : item;
  };

  _proto.nth = function nth(from) {
    var len = this.stack.length;
    return len < from ? null : this.stack[len - from];
  };

  _proto.isEmpty = function isEmpty() {
    return this.stack.length === 0;
  };

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

  _createClass(StackImpl, [{
    key: "size",
    get: function get() {
      return this.stack.length;
    }
  }]);

  return StackImpl;
}();
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