text: import { NotImplementedError } from '../extensions/index.js';
  
  /**
   * Given matrix where you have to find cats by ears "^^"
   *
   * @param {Array<Array>} matrix 
   * @return {Number} count of cats found
   *
   * @example
   * countCats([
   *  [0, 1, '^^'],
   *  [0, '^^', 2],
   *  ['^^', 1, 2]
   * ]) => 3`
   *
   */
  export default function countCats(matrix) {
    let cats = 0;
    for (let i in matrix) {
      cats += matrix[i].filter((item) => item === '^^').length
    }
  
    return cats
  }
  