Method add

Data-Structures/Tree/AVLTree.js:54–58

* For Adding Elements to AVL Tree * @param {any} _val * Since in AVL Tree an element can only occur once so * if a element exists it return false * @returns {Boolean} element added or not

(_val)

   * @returns {Boolean} element added or not
   */
  add(_val) {
    const prevSize = this.size
    this.root = insert(this.root, _val, this)
    return this.size !== prevSize
  }

  /**
   * TO check is a particular element exists or not