JAVASCRIPT FakeDOMStringList.js

class FakeDOMStringList {
  constructor(...values) {
    this._values = values;
    for (let i = 0; i < values.length; i++) {
      this[i] = values[i];
    }
  }
  contains(value) {
    return this._values.includes(value);
  }
  item(i) {
    if (i < 0 || i >= this._values.length) {
      return null;
    }
    return this._values[i];
  }
  get length() {
    return this._values.length;
  }
  [Symbol.iterator]() {
    return this._values[Symbol.iterator]();
  }

  // Handled by proxy

  // Used internally, should not be used by others. I could maybe get rid of these and replace rather than mutate, but too lazy to check the spec.
  _push(...values) {
    for (let i = 0; i < values.length; i++) {
      this[this._values.length + i] = values[i];
    }
    this._values.push(...values);
  }
  _sort(...values) {
    this._values.sort(...values);
    for (let i = 0; i < this._values.length; i++) {
      this[i] = this._values[i];
    }
    return this;
  }
}
export default FakeDOMStringList;