class ModelManager {
  constructor() {
    this._mineself = {};
    this.name = null;
    this.len = 0;
  }

  add(key, value) {
    if (key && value) {
      this._mineself[key] = value;
      this.len++;
    }
  }
  del(key) {
    if (key) {
      if (!this._mineself.hasOwnProperty(key)) return;
      this._mineself[key] = undefined;
      delete this._mineself[key];
      this.len--;
    }
  }

  get(key) {
    if (this._mineself.hasOwnProperty(key) && this._mineself[key]) {
      return this._mineself[key];
    }
    return null;
  }

  clear() {
    this._mineself = {};
  }

  returnObj() {
    return this._mineself;
  }
}

module.exports.ModelManager = ModelManager;