text: import { NotImplementedError } from '../extensions/index.js';
  
  /**
   * Implement class DepthCalculator with method calculateDepth
   * that calculates deoth of nested array
   * 
   * @example
   * 
   * const depthCalc = new DepthCalculator();
   * depthCalc.calculateDepth([1, 2, 3, 4, 5]) => 1
   * depthCalc.calculateDepth([1, 2, 3, [4, 5]]) => 2
   * depthCalc.calculateDepth([[[]]]) => 3
   *
   */
  export default class DepthCalculator {
    calculateDepth(arr) {
      if (!Array.isArray(arr)) {
        return 0;
      }
  
      let s = 0;
      for (let elem of arr) {
        if (Array.isArray(elem)) {
          s = Math.max(s, this.calculateDepth(elem));
        } 
      }
      return 1 + s;
    }
  }
  