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  • 1 (2018-05-11 (金) 19:11:48)
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function FirstClassCollection() {
  this.__content;
}
FirstClassCollection.prototype.size = function () {
  return this.__content.length;
};
FirstClassCollection.prototype.map = function (...args) {
  const newCollection = Object.create(Object.getPrototypeOf(this));
  newCollection.__content = this.__content.map(...args);
  return newCollection;
};

function asFirstClassCollection(target) {
  Object.setPrototypeOf(target, FirstClassCollection.prototype);
  return target;
}

function RaisableCollection() {
  this.__content;
}
Object.setPrototypeOf(RaisableCollection.prototype, FirstClassCollection.prototype);
RaisableCollection.prototype.raise = function() {
  return this.map(value => value * value)
};

function asRaisableCollection(target) {
  Object.setPrototypeOf(target, RaisableCollection.prototype);
  return target;
}