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) {
      let depth = 1;
  
      for (let i = 0; i < arr.length; i += 1) {
        const item = arr[i];
  
        if (Array.isArray(item)) {
          const currentDepth = this.calculateDepth(item) + 1;
  
          if (currentDepth > depth) {
            depth = currentDepth;
          } 
       } 
     }
  
     return depth;
    }
  }
  