Method find

Data-Structures/Tree/AVLTree.js:65–68

* TO check is a particular element exists or not * @param {any} _val * @returns {Boolean} exists or not

(_val)

   * @returns {Boolean} exists or not
   */
  find(_val) {
    const temp = searchAVLTree(this.root, _val, this)
    return temp != null
  }

  /**
   *